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Question 1
Correct
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A 25-year-old woman presents to the neurology clinic with a unilateral hand tremor. Her family has noticed changes in her behavior, mood, and speech over the past year. During the examination, a resting tremor is observed in her right hand, along with bradykinesia and a lack of movement. Additionally, dark circular marks are visible around her iris. The patient mentions that her uncle passed away from liver cirrhosis at the age of 42. What is the probable diagnosis?
Your Answer: Wilson's disease
Explanation:Wilson’s disease is indicated by the presence of both liver and neurological conditions, as well as the presence of Kayser-Fleischer rings and a family history of liver disease.
Wilson’s disease is a genetic disorder that causes excessive copper buildup in the body tissues due to increased copper absorption from the small intestine and decreased hepatic copper excretion. It is an autosomal recessive disorder caused by a defect in the ATP7B gene located on chromosome 13. Symptoms usually appear between the ages of 10 and 25, with children presenting with liver disease and young adults with neurological disease. The disease is characterised by excessive copper deposition in the brain, liver, and cornea, resulting in various symptoms such as hepatitis, cirrhosis, basal ganglia degeneration, speech and behavioural problems, Kayser-Fleischer rings, renal tubular acidosis, haemolysis, and blue nails.
To diagnose Wilson’s disease, a slit lamp examination is conducted to check for Kayser-Fleischer rings, and blood and urine tests are performed to measure copper levels. The diagnosis is confirmed by genetic analysis of the ATP7B gene. The traditional first-line treatment for Wilson’s disease is penicillamine, which chelates copper. However, trientine hydrochloride is an alternative chelating agent that may become first-line treatment in the future. Tetrathiomolybdate is a newer agent that is currently under investigation for the treatment of Wilson’s disease.
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This question is part of the following fields:
- Gastroenterology/Nutrition
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Question 2
Incorrect
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A 35-year-old woman with a dichorionic twin pregnancy is concerned about the possibility of her twins having Down's syndrome. What is the most suitable investigation to perform in this case?
Your Answer: Triple screen (maternal serum biochemistry)
Correct Answer: Nuchal translucency ultrasonography on each twin
Explanation:There are several methods for screening and diagnosing Down’s syndrome in pregnancy. The nuchal translucency scan, which measures fluid in the fetal neck, is best done between 11 and 14 weeks and can detect an increased risk of genetic syndromes. The triple screen, which measures levels of certain hormones in the mother’s blood, is done in the second trimester and can detect up to 69% of cases in singleton pregnancies, but may have a higher false positive or false negative in twin pregnancies. Amniocentesis and chorionic villous sampling are invasive diagnostic tests that can detect chromosomal disorders with high accuracy, but carry a small risk of pregnancy loss. The routine anomaly scan should not be used for Down’s syndrome screening. Cell-free fetal DNA screening is a newer method that can detect about 99% of Down’s syndrome pregnancies, but is currently only offered by private clinics at a high cost. A positive screening result suggests an increased risk for Down’s syndrome, and definitive testing with chorionic villous sampling or amniocentesis is indicated.
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This question is part of the following fields:
- Reproductive Medicine
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Question 3
Correct
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A 87-year-old woman presents with disorientation and restlessness. She has a history of hypertension, atrial fibrillation, polymyalgia rheumatica, osteoarthritis and a hiatus hernia. Her current medications include bisoprolol, digoxin, amlodipine, omeprazole, prednisolone and as required paracetamol. She lives independently and is usually mentally alert. She has been increasingly unwell for the past week, complaining of increased pain in her shoulders, so her GP has increased the dose of prednisolone from 5mg to 30mg daily and added codeine 30mg four times a day. Physical examination and blood tests are unremarkable.
Which of the following is the most likely diagnosis?
Select the SINGLE most likely diagnosis from the list below. Select ONE option only.Your Answer: Polypharmacy
Explanation:Understanding the Possible Causes of Delirium in the Elderly: A Case Study
This patient is most likely experiencing delirium, which is a common condition among the elderly. One of the leading causes of delirium in this population is polypharmacy, which refers to taking multiple medications. In this case, the patient’s unremarkable physical examination and blood tests suggest that polypharmacy is the most likely explanation for her symptoms. Steroids and opioids, which she recently started taking, are known to cause delirium, especially in older adults. Patients with dementia or mild cognitive impairment are particularly vulnerable to the effects of polypharmacy.
Accidental poisoning is also a possibility, but the patient’s usual independence and mental alertness make this less likely. Additionally, her symptoms have been present for a week, which suggests a longer process than accidental poisoning. A chest infection could also cause delirium, but the patient’s examination and blood tests do not support this diagnosis.
Alcohol withdrawal is another potential cause of disorientation and restlessness, but there is no indication in the patient’s history that she is misusing alcohol. Finally, Alzheimer’s disease is unlikely given the short duration of the patient’s symptoms and her usual mental alertness. Overall, polypharmacy is the most probable cause of this patient’s delirium.
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This question is part of the following fields:
- Psychiatry
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Question 4
Correct
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A 28-year-old woman visits her GP because she is worried about her ability to conceive. She has experienced three miscarriages in the past five years and has also had an unprovoked deep vein thrombosis. The GP orders various blood tests and suspects that one of them may show a positive result for a potential cause of her issues.
Which of the following antibody tests is the most likely to be positive? Choose only ONE option.Your Answer: Anti-phospholipid antibodies
Explanation:Autoimmune Antibodies and Their Associated Conditions
Autoimmune disorders are conditions in which the immune system mistakenly attacks the body’s own tissues. One way to diagnose autoimmune disorders is by testing for specific antibodies that are associated with certain conditions. Here are some common autoimmune antibodies and the conditions they are associated with:
1. Anti-phospholipid antibodies: These antibodies are linked to anti-phospholipid syndrome (APS), also known as Hughes’ syndrome. APS can cause blood clots and pregnancy-related complications.
2. Anti-endomysial antibodies: These antibodies are associated with coeliac disease, an autoimmune disorder that affects the small intestine.
3. Anti-histone antibodies: These antibodies are linked to drug-induced systemic lupus erythematosus (SLE), another autoimmune disorder.
4. Anti-mitochondrial antibodies: These antibodies are associated with primary biliary cholangitis, autoimmune hepatitis, and idiopathic cirrhosis, all of which affect the liver.
5. Anti-nuclear antibodies: These antibodies are associated with several autoimmune disorders, including SLE, autoimmune hepatitis, Sjögren’s syndrome, systemic sclerosis, and rheumatoid arthritis.
Testing for these antibodies can help diagnose autoimmune disorders and guide treatment.
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This question is part of the following fields:
- Haematology/Oncology
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Question 5
Incorrect
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A 55-year-old woman presents after a fall. She reports pain and weakness in her hands for several months, stiff legs and swallowing difficulties, and has bilateral wasting of the small muscles of her hands. Reflexes in the upper limbs are absent. Tongue fasciculations are present, and both legs show increased tone, pyramidal weakness and hyperreflexia with extensor plantars. Pain and temperature sensation is impaired in the upper limbs.
Which of the following is the most likely diagnosis?
Select the SINGLE most appropriate diagnosis from the list below. Select ONE option only.Your Answer: Motor neurone disease (MND)
Correct Answer: Syringobulbia
Explanation:Syringobulbia is a condition where a fluid-filled cyst/syrinx is present in the spinal cord, extending up to the medulla of the brainstem, causing cranial nerve palsies. It results in dissociated sensory loss and LMN signs at the level of the lesion, with UMN signs below the lesion. Cranial nerve involvement may include facial sensory loss, vertigo, nystagmus, facial, palatal, and laryngeal nerve palsy, and weakness, atrophy, and fasciculation of the tongue. This condition is different from cervical spondylosis, multiple sclerosis, and motor neuron disease, which have distinct clinical features. Syringomyelia is a similar condition, but it progresses slowly over years and affects the cervical area of the cord, leading to early loss of pain and temperature sensation, with preservation of light touch and proprioception. Syringobulbia is characterized by LMN lesions of cranial nerve XII, suggesting the lesion extends above the spinal cord and into the brainstem.
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This question is part of the following fields:
- Neurology
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Question 6
Correct
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A 35-year-old male is admitted to hospital after an overdose of paracetamol. He waited until his children had gone to school and his wife had left for work before taking 100 tablets. He did not drink any alcohol and rarely has any. He had taken annual leave from the steady job in a factory and had left a note. His wife had forgotten something so returned from work earlier than usual and found him semi-conscious.
After treatment for his physical health he tells you that he does not regret the attempt but feels bad that he has put his children through enough seeing him in hospital. He is not religious. His wife is not very supportive of him and thinks he is 'attention-seeking'. He has no other family or friends locally. He has struggled with symptoms of depression for a number of months and has never sought help, but otherwise is physically well.
During your assessment, you want to ascertain any protective factors.
Which of the following is a protective factor in this case?Your Answer: She has children at home
Explanation:Completed suicide can be prevented by certain protective factors such as having social support, religious beliefs, having children at home, and regretting a previous attempt. It is important to note that the duration of mental illness is not a determining factor, but having a mental illness, especially depression, increases the risk. Alcohol misuse is also a risk factor, but in this scenario, the fact that the person does not drink much alcohol is not particularly protective. The individual in the scenario lacks social support and is not religious, making those options incorrect. However, having children present at home is a protective factor.
Suicide Risk Factors and Protective Factors
Suicide risk assessment is a common practice in psychiatric care, with patients being stratified into high, medium, or low risk categories. However, there is a lack of evidence on the positive predictive value of individual risk factors. A review in the BMJ concluded that such assessments may not be useful in guiding decision-making, as 50% of suicides occur in patients deemed low risk. Nevertheless, certain factors have been associated with an increased risk of suicide, including male sex, history of deliberate self-harm, alcohol or drug misuse, mental illness, depression, schizophrenia, chronic disease, advancing age, unemployment or social isolation, and being unmarried, divorced, or widowed.
If a patient has attempted suicide, there are additional risk factors to consider, such as efforts to avoid discovery, planning, leaving a written note, final acts such as sorting out finances, and using a violent method. On the other hand, there are protective factors that can reduce the risk of suicide, such as family support, having children at home, and religious belief. It is important to consider both risk and protective factors when assessing suicide risk and developing a treatment plan.
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This question is part of the following fields:
- Psychiatry
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Question 7
Incorrect
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A 68-year-old male presents to the general practitioner with progressive dyspnoea, chronic cough and wheeze. He has a 50-pack-year smoking history and a past medical history of atopy and is currently taking a salbutamol inhaler. Spirometry shows a forced expiratory volume over 1 second (FEV1) of 55% predicted and an FEV1/forced vital capacity (FVC) ratio of 0.49. The patient also keeps a peak flow diary, which shows a diurnal variation in readings.
What is the most appropriate next step in managing this patient?Your Answer: Ipratropium and beclomethasone bronchodilator therapy
Correct Answer: Salmeterol and beclomethasone bronchodilator therapy
Explanation:NICE guidelines recommend smoking cessation advice, annual influenza and one-off pneumococcal vaccinations, and pulmonary rehabilitation for COPD patients. Bronchodilator therapy is first-line treatment, with the addition of LABA and LAMA for patients without asthmatic features and LABA, ICS, and LAMA for those with asthmatic features. Theophylline is recommended after trials of bronchodilators or for patients who cannot use inhaled therapy. Azithromycin prophylaxis is recommended in select patients. Mucolytics should be considered for patients with a chronic productive cough. Loop diuretics and long-term oxygen therapy may be used for cor pulmonale. Smoking cessation and long-term oxygen therapy may improve survival in stable COPD patients. Lung volume reduction surgery may be considered in selected patients.
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This question is part of the following fields:
- Respiratory Medicine
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Question 8
Incorrect
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A diabetic woman in her 50s presents with painful diabetic neuropathy in her feet. She has no other significant medical history. What is the recommended initial treatment to alleviate her pain?
Your Answer: Carbamazepine
Correct Answer: Duloxetine
Explanation:Diabetes can cause peripheral neuropathy, which typically results in sensory loss rather than motor loss. This often affects the lower legs first due to the length of the sensory neurons supplying this area, resulting in a glove and stocking distribution. Painful diabetic neuropathy is a common issue that can be managed with drugs such as amitriptyline, duloxetine, gabapentin, or pregabalin. If these drugs do not work, tramadol may be used as a rescue therapy, and topical capsaicin may be used for localized neuropathic pain. Pain management clinics may also be helpful for patients with resistant problems.
Gastrointestinal autonomic neuropathy can cause gastroparesis, which can lead to erratic blood glucose control, bloating, and vomiting. This can be managed with prokinetic agents such as metoclopramide, domperidone, or erythromycin. Chronic diarrhea, which often occurs at night, is another potential complication of diabetic neuropathy. Gastroesophageal reflux disease can also occur due to decreased lower esophageal sphincter pressure.
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This question is part of the following fields:
- Endocrinology/Metabolic Disease
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Question 9
Correct
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A 68-year-old man with atrial fibrillation (AF) visits the Emergency Room (ER) with complaints of intense abdominal pain that has been ongoing for the past two hours. His arterial blood gas results reveal metabolic acidosis with elevated lactate levels.
What is the most probable diagnosis from the options below?Your Answer: Ischaemic colitis
Explanation:Ischaemic colitis is a condition where a segment of the colon does not receive enough blood supply, resulting in varying degrees of tissue death. It is typically seen in older individuals with atherosclerosis of the mesenteric vessels, but can also be caused by other factors such as embolic disease, vasculitis, and trauma. The main symptom is severe pain that is not proportional to physical exam findings. Serum lactate levels may be elevated, but this does not necessarily indicate GI ischemia. Diagnosis can be confirmed with contrast-enhanced CT or early endoscopy. Prognosis is poor, especially in cases of occlusive mesenteric infarction. Colorectal cancer typically presents with bleeding, change in bowel habits, and abdominal pain, but the patient’s hyperacute onset of symptoms makes this diagnosis unlikely. Diverticulitis is inflammation of a diverticulum in the colon and presents with left lower quadrant pain, but the patient’s other symptoms are not consistent with this diagnosis. Community-acquired pneumonia and pyelonephritis also have different clinical presentations and are not likely in this case.
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This question is part of the following fields:
- Gastroenterology/Nutrition
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Question 10
Correct
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A 3-year-old child presents to the emergency department with a 3 day history of left knee pain and irritability. The child had recently recovered from a viral respiratory tract infection and is currently asymptomatic and without fever. Upon examination, the joint is painful to move but not hot or red, and the child is able to bear weight. Laboratory results reveal a hemoglobin level of 140 g/L (male: 135-180, female: 115-160), platelet count of 450 * 109/L (150-400), white cell count of 11.5 * 109/L (4.0-11.0), CRP of 29 mg/L (<5), and ESR of 32 mm/hr (0-10). What is the most likely diagnosis?
Your Answer: Transient synovitis
Explanation:Understanding Septic Arthritis in Children
Septic arthritis is a condition that affects children and can lead to permanent joint damage and systemic infection if not treated promptly. It has an incidence of around 4-5 per 100,000 children and is more common in boys, with a M:F ratio of 2:1. The hip, knee, and ankle are the most commonly affected joints. Symptoms of septic arthritis include joint pain, limp, fever, and lethargy. Signs of the condition include a swollen and red joint, with minimal movement possible.
To diagnose septic arthritis, joint aspiration is necessary to culture the affected area. This will show a raised white blood cell count. Inflammatory markers in the blood will also be raised, and blood cultures will be taken. The Kocher criteria are used to diagnose septic arthritis and include a fever of over 38.5 degrees Celsius, non-weight bearing, raised erythrocyte sedimentation rate (ESR), and raised white cell count (WCC).
Understanding septic arthritis in children is crucial for prompt diagnosis and treatment to reduce the risk of permanent joint damage and systemic infection.
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This question is part of the following fields:
- Paediatrics
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Question 11
Correct
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A 25-year-old man presents to the GP with a swelling in his scrotum. He is feeling well otherwise. Upon examination, there is a soft swelling on the right side of the scrotum that is painless and illuminates brightly with a pen torch. The swelling is localized to the scrotum, and the rest of the scrotum can be palpated above the mass. The testicle is palpable with no apparent mass. The patient is particularly concerned about the possibility of having testicular cancer.
What is the most probable diagnosis?Your Answer: Hydrocele
Explanation:Scrotal swelling caused by an accumulation of fluid in the tunica vaginalis is known as a hydrocele. This condition can be identified by its ability to transilluminate brightly with a pen torch and is confined to the scrotum. While epididymo-orchitis can also cause unilateral swelling, it is typically tender and accompanied by systemic symptoms. Testicular cancer may lead to a hydrocele, but if the testis is palpable and normal, it is less likely to be the cause of the swelling. In cases where the testis is not palpable, patients should be referred for a testicular ultrasound.
Common Scrotal Problems and Their Features
Epididymal cysts, hydroceles, and varicoceles are the most common scrotal problems seen in primary care. Epididymal cysts are usually found posterior to the testicle and are separate from the body of the testicle. They may be associated with conditions such as polycystic kidney disease, cystic fibrosis, and von Hippel-Lindau syndrome. Diagnosis is confirmed by ultrasound, and management is usually supportive, although surgical removal or sclerotherapy may be attempted for larger or symptomatic cysts.
Hydroceles, on the other hand, describe the accumulation of fluid within the tunica vaginalis. They may be communicating or non-communicating, and may develop secondary to conditions such as epididymo-orchitis, testicular torsion, or testicular tumors. Hydroceles are usually soft, non-tender swellings of the hemi-scrotum that transilluminate with a pen torch. Diagnosis may be clinical, but ultrasound is required if there is any doubt about the diagnosis or if the underlying testis cannot be palpated. Management depends on the severity of the presentation, with infantile hydroceles generally repaired if they do not resolve spontaneously by the age of 1-2 years.
Varicoceles, on the other hand, are abnormal enlargements of the testicular veins that are usually asymptomatic but may be associated with subfertility. They are much more common on the left side and are classically described as a bag of worms. Diagnosis is confirmed by ultrasound with Doppler studies, and management is usually conservative, although surgery may be required if the patient is troubled by pain. There is ongoing debate regarding the effectiveness of surgery to treat infertility.
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This question is part of the following fields:
- Renal Medicine/Urology
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Question 12
Incorrect
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An 80-year-old man is receiving treatment at the Haematology Clinic for multiple myeloma (MM). He is a newly diagnosed non-transplant candidate.
Various blood tests are being conducted to monitor response to treatment and determine prognosis.
What is considered the most crucial factor for predicting survival and prognosis?Your Answer:
Correct Answer: Beta-2 microglobulin
Explanation:Prognostic Factors in Multiple Myeloma
Multiple myeloma is a type of cancer that affects plasma cells in the bone marrow. Prognostic factors are important in determining the severity of the disease and predicting survival rates. Here are some key factors to consider:
Beta-2 microglobulin: This protein is found on the surface of all nucleated cells and is associated with the human leukocyte antigen (HLA)–histocompatibility complex. Elevated levels of serum beta-2 microglobulin are linked to poor prognosis in multiple myeloma patients.
Serum creatinine: High levels of creatinine indicate renal impairment, which is common in multiple myeloma patients and is associated with a poor prognosis.
Albumin: Low levels of albumin are related to the extent of myeloma proliferation and are therefore of diagnostic and prognostic importance. An albumin level of 29.0 g/l or less is a sign of advanced disease.
C-Reactive protein (CRP): Elevated CRP levels before autologous stem-cell transplantation (ASCT) are associated with worse overall survival in multiple myeloma patients, especially those who had a transplant more than 12 months after diagnosis.
Lactate dehydrogenase (LDH): High LDH levels at the time of diagnosis are a marker of poor prognosis in multiple myeloma patients. Increased LDH is associated with worse overall survival, progression-free survival, aggressive disease, and high tumor burden.
Understanding these prognostic factors can help healthcare providers make informed decisions about treatment options and provide patients with more accurate information about their disease.
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This question is part of the following fields:
- Haematology/Oncology
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Question 13
Incorrect
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A 5-year-old boy with sickle cell anaemia complains of abdominal pain. During the physical examination, the doctor observes splenomegaly and signs of anaemia. What is the probable diagnosis?
Your Answer:
Correct Answer: Sequestration crisis
Explanation:In a sequestration crisis, the sickle cells lead to significant enlargement of the spleen, which causes abdominal pain as seen in this case. This is more prevalent in early childhood as repeated sequestration and infarction of the spleen during childhood can eventually lead to an auto-splenectomy. A sequestration crisis can result in severe anemia, noticeable pallor, and cardiovascular collapse due to the loss of effective circulating volume.
Sickle cell anaemia is a condition that involves periods of good health with intermittent crises. There are several types of crises that can occur, including thrombotic or painful crises, sequestration, acute chest syndrome, aplastic, and haemolytic. Thrombotic crises, also known as painful crises or vaso-occlusive crises, are triggered by factors such as infection, dehydration, and deoxygenation. These crises are diagnosed clinically and can result in infarcts in various organs, including the bones, lungs, spleen, and brain.
Sequestration crises occur when sickling occurs within organs such as the spleen or lungs, leading to pooling of blood and worsening of anaemia. This type of crisis is associated with an increased reticulocyte count. Acute chest syndrome is caused by vaso-occlusion within the pulmonary microvasculature, resulting in infarction in the lung parenchyma. Symptoms include dyspnoea, chest pain, pulmonary infiltrates on chest x-ray, and low pO2. Management involves pain relief, respiratory support, antibiotics, and transfusion.
Aplastic crises are caused by infection with parvovirus and result in a sudden fall in haemoglobin. Bone marrow suppression leads to a reduced reticulocyte count. Haemolytic crises are rare and involve a fall in haemoglobin due to an increased rate of haemolysis. It is important to recognise and manage these crises promptly, as they can lead to serious complications and even death.
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This question is part of the following fields:
- Haematology/Oncology
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Question 14
Incorrect
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A 16-year-old female comes in for a follow-up. Three days ago she visited her physician with complaints of a severe sore throat, fatigue, and headache. The doctor prescribed amoxicillin to treat an upper respiratory tract infection. However, two days ago she developed a pruritic maculopapular rash that has spread throughout her body. Additionally, her initial symptoms have not improved. What is the probable diagnosis?
Your Answer:
Correct Answer: Infectious mononucleosis
Explanation:Patients with infectious mononucleosis should not be prescribed amoxicillin. Instead, supportive treatment is recommended for their care.
Understanding Infectious Mononucleosis
Infectious mononucleosis, also known as glandular fever, is a viral infection caused by the Epstein-Barr virus (EBV) in 90% of cases. It is most commonly seen in adolescents and young adults. The classic triad of symptoms includes sore throat, pyrexia, and lymphadenopathy, which are present in around 98% of patients. Other symptoms include malaise, anorexia, headache, palatal petechiae, splenomegaly, hepatitis, lymphocytosis, haemolytic anaemia, and a maculopapular rash. The symptoms typically resolve after 2-4 weeks.
The diagnosis of infectious mononucleosis is confirmed through a heterophil antibody test (Monospot test) in the second week of the illness. Management is supportive and includes rest, drinking plenty of fluids, avoiding alcohol, and taking simple analgesia for any aches or pains. It is recommended to avoid playing contact sports for 4 weeks after having glandular fever to reduce the risk of splenic rupture.
Interestingly, there is a correlation between EBV and socioeconomic groups. Lower socioeconomic groups have high rates of EBV seropositivity, having frequently acquired EBV in early childhood when the primary infection is often subclinical. However, higher socioeconomic groups show a higher incidence of infectious mononucleosis, as acquiring EBV in adolescence or early adulthood results in symptomatic disease.
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This question is part of the following fields:
- Dermatology
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Question 15
Incorrect
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A 26-year-old patient visits the GP clinic seeking a sexual health examination. He engages in sexual activity with men and practices unprotected anal intercourse as both the insertive and receptive partner. He has never undergone any HIV testing and desires a prompt result. What is the most suitable test to request for this patient?
Your Answer:
Correct Answer: HIV p24 antigen and HIV antibody test
Explanation:The current standard for HIV diagnosis and screening involves a combination of p24 antigen and HIV antibody tests. This is because the HIV antibody may not be detectable until 4-6 weeks after infection, while the p24 antigen can show up as early as 1 week after infection. By using both tests, a more accurate assessment of infectious status can be made, allowing for discussions about pre-exposure prophylaxis and safe sexual practices. HIV viral load levels are not used for diagnosis, but can be helpful in assessing treatment efficacy after diagnosis has been confirmed. It is important to note that viral load testing should not be used alone, but rather in conjunction with the antibody and antigen tests.
Understanding HIV Seroconversion and Diagnosis
HIV seroconversion is a process where the body develops antibodies to the HIV virus after being infected. This process is symptomatic in 60-80% of patients and usually presents as a glandular fever type illness. Symptoms may include sore throat, lymphadenopathy, malaise, myalgia, arthralgia, diarrhea, maculopapular rash, mouth ulcers, and rarely meningoencephalitis. The severity of symptoms is associated with a poorer long-term prognosis and typically occurs 3-12 weeks after infection.
Diagnosing HIV involves testing for HIV antibodies, which may not be present in early infection. However, most people develop antibodies to HIV at 4-6 weeks, and 99% do so by 3 months. The diagnosis usually consists of both a screening ELISA test and a confirmatory Western Blot Assay. Additionally, a p24 antigen test may be used to detect a viral core protein that appears early in the blood as the viral RNA levels rise. Combination tests that test for both HIV p24 antigen and HIV antibody are now standard for the diagnosis and screening of HIV. If the combined test is positive, it should be repeated to confirm the diagnosis. Testing for HIV in asymptomatic patients should be done at 4 weeks after possible exposure, and after an initial negative result, a repeat test should be offered at 12 weeks.
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This question is part of the following fields:
- Infectious Diseases
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Question 16
Incorrect
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An elderly woman of 74 years old comes in with a vesicular rash surrounding her left eye. The eye appears red and she is experiencing some sensitivity to light. The initial diagnosis is herpes zoster ophthalmicus and an immediate referral to ophthalmology is arranged. What is the probable treatment she will receive?
Your Answer:
Correct Answer: Oral aciclovir
Explanation:If systemic therapy is administered, topical antivirals are unnecessary. However, secondary inflammation may be treated with topical corticosteroids.
Herpes Zoster Ophthalmicus: Symptoms, Treatment, and Complications
Herpes zoster ophthalmicus (HZO) is a condition that occurs when the varicella-zoster virus reactivates in the area supplied by the ophthalmic division of the trigeminal nerve. It is responsible for approximately 10% of shingles cases. The main symptom of HZO is a vesicular rash around the eye, which may or may not involve the eye itself. Hutchinson’s sign, a rash on the tip or side of the nose, is a strong indicator of nasociliary involvement and increases the risk of ocular involvement.
Treatment for HZO involves oral antiviral medication for 7-10 days, ideally started within 72 hours of symptom onset. Intravenous antivirals may be necessary for severe infections or immunocompromised patients. Topical antiviral treatment is not recommended for HZO, but topical corticosteroids may be used to treat any secondary inflammation of the eye. Ocular involvement requires urgent ophthalmology review to prevent complications such as conjunctivitis, keratitis, episcleritis, anterior uveitis, ptosis, and post-herpetic neuralgia.
In summary, HZO is a condition caused by the reactivation of the varicella-zoster virus in the ophthalmic division of the trigeminal nerve. It presents with a vesicular rash around the eye and may involve the eye itself. Treatment involves oral antiviral medication and urgent ophthalmology review is necessary for ocular involvement. Complications of HZO include various eye conditions, ptosis, and post-herpetic neuralgia.
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This question is part of the following fields:
- Ophthalmology
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Question 17
Incorrect
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A 28-year-old woman is being seen in the asthma clinic. She is currently on salbutamol inhaler 100mcg prn and beclometasone dipropionate inhaler 400 mcg bd, but is experiencing frequent asthma exacerbations and has recently undergone a course of prednisolone. In accordance with NICE guidelines, what would be the most suitable course of action for her management?
Your Answer:
Correct Answer: Add a leukotriene receptor antagonist
Explanation:According to NICE 2017 guidelines, if a patient with asthma is not effectively managed with a SABA + ICS, the first step should be to add a LTRA rather than a LABA.
The management of asthma in adults has been updated by NICE in 2017, following the 2016 BTS guidelines. One of the significant changes is in ‘step 3’, where patients on a SABA + ICS whose asthma is not well controlled should be offered a leukotriene receptor antagonist instead of a LABA. NICE does not follow the stepwise approach of the previous BTS guidelines, but to make the guidelines easier to follow, we have added our own steps. The steps range from newly-diagnosed asthma to SABA +/- LTRA + one of the following options, including increasing ICS to high-dose, a trial of an additional drug, or seeking advice from a healthcare professional with expertise in asthma. Maintenance and reliever therapy (MART) is a form of combined ICS and LABA treatment that is only available for ICS and LABA combinations in which the LABA has a fast-acting component. It should be noted that NICE does not recommend changing treatment in patients who have well-controlled asthma simply to adhere to the latest guidance. The definitions of what constitutes a low, moderate, or high-dose ICS have also changed, with <= 400 micrograms budesonide or equivalent being a low dose, 400 micrograms - 800 micrograms budesonide or equivalent being a moderate dose, and > 800 micrograms budesonide or equivalent being a high dose for adults.
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This question is part of the following fields:
- Respiratory Medicine
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Question 18
Incorrect
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A 75-year-old man has been hospitalized with abdominal discomfort. The surgical team intends to conduct a contrast-enhanced CT scan, but they are apprehensive due to his stage 3 chronic kidney disease. Below is his most recent renal function:
Na+ 142 mmol/l
K+ 4.6 mmol/l
Urea 8.1 mmol/l
Creatinine 130 µmol/l
What is the most crucial measure in decreasing the risk of contrast-induced nephropathy?Your Answer:
Correct Answer: Intravenous 0.9% sodium chloride pre- and post-procedure
Explanation:Contrast Media Nephrotoxicity and Prevention
Contrast media nephrotoxicity is a condition where there is a 25% increase in creatinine within three days of intravascular administration of contrast media. This condition usually occurs 2-5 days after administration and is caused by various risk factors such as known renal impairment, dehydration, cardiac failure, and the use of nephrotoxic drugs. Procedures such as CT with contrast and coronary angiography/percutaneous coronary intervention (PCI) are examples that may cause contrast-induced nephropathy.
To prevent contrast-induced nephropathy, intravenous 0.9% sodium chloride at a rate of 1 mL/kg/hour for 12 hours pre- and post-procedure is recommended. Isotonic sodium bicarbonate is also supported by evidence. However, N-acetylcysteine, which was previously given, is now considered ineffective. Patients who are high-risk for contrast-induced nephropathy should have metformin withheld for at least 48 hours and until their renal function has been shown to be normal to avoid the risk of lactic acidosis.
In summary, contrast media nephrotoxicity is a condition that can occur after the administration of contrast media. It is caused by various risk factors and can be prevented by using intravenous sodium chloride or isotonic sodium bicarbonate. N-acetylcysteine is no longer recommended, and patients at high risk should have metformin withheld until their renal function is normal.
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This question is part of the following fields:
- Renal Medicine/Urology
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Question 19
Incorrect
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A 65-year-old woman with diabetes undergoes routine blood work and evaluation. Her estimated glomerular filtration rate (eGFR) is reported as 52 ml/min/1.73 m2 (reference range >90 ml/min/1.73 m2). How would you classify her kidney function?
Your Answer:
Correct Answer: CKD stage 3a
Explanation:Understanding Chronic Kidney Disease Stages
Chronic kidney disease (CKD) is a condition where the kidneys gradually lose their function over time. To help diagnose and manage CKD, doctors use a staging system based on the glomerular filtration rate (GFR), which measures how well the kidneys are filtering waste from the blood.
There are five stages of CKD, each with a different GFR range and level of kidney function.
– Stage 1: GFR >90 ml/min/1.73 m2 (normal or high)
– Stage 2: GFR 60–89 ml/min/1.73 m2 (mildly decreased)
– Stage 3a: GFR 45–59 ml/min/1.73 m2 (mildly to moderately decreased)
– Stage 3b: GFR 30–44 ml/min/1.73 m2 (moderately to severely decreased)
– Stage 4: GFR 15–29 ml/min/1.73 m2 (severely decreased)
– Stage 5: GFR <15 ml/min/1.73 m2 (kidney failure) The 2008 NICE guideline on CKD recommends subdividing stage 3 into 3a and 3b, and adding the suffix ‘P’ to denote significant proteinuria at any stage. Significant proteinuria is defined as a urinary albumin : creatinine ratio (ACR) of 30 mg/mmol or higher. Understanding the stage of CKD can help doctors determine the appropriate treatment and management plan for their patients. It’s important for individuals with CKD to work closely with their healthcare team to monitor their kidney function and manage any related health issues. -
This question is part of the following fields:
- Renal Medicine/Urology
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Question 20
Incorrect
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A mother brings her 10-month-old baby to the doctor because of a diaper rash. During the examination, the doctor observes a red rash with flexural sparing. What is the probable reason for this?
Your Answer:
Correct Answer: Irritant dermatitis
Explanation:Understanding Napkin Rashes and How to Manage Them
Napkin rashes, also known as nappy rashes, are common skin irritations that affect babies and young children. The most common cause of napkin rash is irritant dermatitis, which is caused by the irritant effect of urinary ammonia and faeces. This type of rash typically spares the creases. Other causes of napkin rash include candida dermatitis, seborrhoeic dermatitis, psoriasis, and atopic eczema.
To manage napkin rash, it is recommended to use disposable nappies instead of towel nappies and to expose the napkin area to air when possible. Applying a barrier cream, such as Zinc and castor oil, can also help. In severe cases, a mild steroid cream like 1% hydrocortisone may be necessary. If the rash is suspected to be candidal nappy rash, a topical imidazole should be used instead of a barrier cream until the candida has settled.
Understanding the different types of napkin rashes and their causes is important in managing them effectively. By following these general management points, parents and caregivers can help prevent and alleviate napkin rashes in babies and young children.
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This question is part of the following fields:
- Paediatrics
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Question 21
Incorrect
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A 65-year-old woman with a history of early-onset Alzheimer's disease, difficult-to-manage hypertension, and incontinence presents to you with a complaint of increased urinary incontinence when coughing or sneezing after starting a new medication. Which of the following medications is the most likely culprit?
Your Answer:
Correct Answer: Doxazosin
Explanation:Relaxation of the bladder outlet and urethra caused by doxazosin can exacerbate stress incontinence symptoms. This medication, classified as an alpha blocker, is commonly prescribed for hypertension and benign prostatic hyperplasia-related urinary retention. Therefore, doxazosin is the appropriate response.
Understanding Urinary Incontinence: Causes, Classification, and Management
Urinary incontinence (UI) is a common condition that affects around 4-5% of the population, with elderly females being more susceptible. Several risk factors contribute to UI, including advancing age, previous pregnancy and childbirth, high body mass index, hysterectomy, and family history. UI can be classified into different types, such as overactive bladder (OAB)/urge incontinence, stress incontinence, mixed incontinence, overflow incontinence, and functional incontinence.
Initial investigation of UI involves completing bladder diaries for at least three days, vaginal examination, urine dipstick and culture, and urodynamic studies. Management of UI depends on the predominant type of incontinence. For urge incontinence, bladder retraining and bladder stabilizing drugs such as antimuscarinics are recommended. For stress incontinence, pelvic floor muscle training and surgical procedures such as retropubic mid-urethral tape procedures may be offered. Duloxetine, a combined noradrenaline and serotonin reuptake inhibitor, may also be used as an alternative to surgery.
In summary, understanding the causes, classification, and management of UI is crucial in providing appropriate care for patients. Early diagnosis and intervention can significantly improve the quality of life for those affected by this condition.
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This question is part of the following fields:
- Renal Medicine/Urology
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Question 22
Incorrect
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A 68-year-old man who is a smoker presents with complaints about his left eye. Upon examination, it is found that he has a constricted left pupil with a ptosis and anhidrosis.
What is the most probable diagnosis?Your Answer:
Correct Answer: Horner syndrome
Explanation:Horner syndrome is a rare condition caused by a disruption of the sympathetic nerve supply to the eye. It is characterized by a triad of symptoms including a constricted pupil, partial drooping of the eyelid, and loss of sweating on one side of the face. Possible causes of Horner syndrome include brain-stem stroke or tumor, brachial plexus trauma, lung infections or tumors, carotid artery issues, and migraines. Multiple sclerosis is an autoimmune disease that attacks the central nervous system and can cause optic neuritis, but the symptoms described in the scenario do not match those of MS. Holmes-Adie syndrome is a neurological disorder characterized by a dilated pupil that reacts slowly to light, loss of deep tendon reflexes, and profuse sweating, which is not consistent with the scenario. Myasthenia gravis is an autoimmune disorder that causes muscle weakness, but it typically affects the facial muscles and extraocular muscles, not the pupil. Riley-Day syndrome is a disorder of the autonomic nervous system that affects infants and is characterized by the absence of overflow tears with emotional crying.
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This question is part of the following fields:
- Neurology
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Question 23
Incorrect
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A 35-year-old woman is admitted for an endoscopic retrograde cholangiopancreatography (ERCP) due to biliary colic. She has an uneventful procedure but is re-admitted the same night with severe abdominal pain.
On examination, she is tachycardic, short of breath, and has a pleural effusion on her chest X-ray (CXR).
Investigations reveal the following:
Investigation Result Normal value
C-reactive protein (CRP) 180 mg/l < 10 mg/l
White cell count (WCC) 15.0 × 109/l 4.0–11.0 × 109/l
Creatine (Cr) 140 µmol/l 50–120µmol/l
Urea 7.5mmol/l 2.5–6.5mmol/l
Phosphate (PO4-) 1.0mmol/l 0.8–1.5 mmol/l
Corrected Calcium (Ca2+) 0.8 mmol/l 2.20–2.60 mmol/l
What is her most likely diagnosis?Your Answer:
Correct Answer: Pancreatitis
Explanation:Understanding Complications of ERCP: Pancreatitis, Cholangitis, and More
ERCP (endoscopic retrograde cholangiopancreatography) is a common procedure used to diagnose and treat conditions of the bile ducts and pancreas. However, like any medical procedure, it carries risks and potential complications. One such complication is pancreatitis, which can present with non-specific symptoms but may be accompanied by hypocalcaemia. Immediate management includes confirming the diagnosis and severity of pancreatitis, intravenous fluid resuscitation, oxygen, and adequate analgesia. Another potential complication is ascending cholangitis, which can present with fever, jaundice, and abdominal pain. Biliary perforation is a serious but infrequent complication that is usually recognized during the procedure, while intestinal perforation is not an expected complication. A reaction to contrast would have occurred during the procedure. It is important to understand these potential complications and their symptoms in order to provide prompt and appropriate management.
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This question is part of the following fields:
- Gastroenterology/Nutrition
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Question 24
Incorrect
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A 75-year-old man is being evaluated after experiencing an ischemic stroke. He has a history of being unable to tolerate clopidogrel. What is the best treatment option to decrease his risk of having another stroke?
Your Answer:
Correct Answer: Aspirin + dipyridamole lifelong
Explanation:Lifelong use of aspirin and dipyridamole. Age: 55.
The Royal College of Physicians (RCP) and NICE have published guidelines on the diagnosis and management of patients following a stroke. The management of acute stroke includes maintaining normal levels of blood glucose, hydration, oxygen saturation, and temperature. Blood pressure should not be lowered in the acute phase unless there are complications. Aspirin should be given as soon as possible if a haemorrhagic stroke has been excluded. Anticoagulants should not be started until brain imaging has excluded haemorrhage. Thrombolysis with alteplase should only be given if administered within 4.5 hours of onset of stroke symptoms and haemorrhage has been definitively excluded. Mechanical thrombectomy is a new treatment option for patients with an acute ischaemic stroke. NICE recommends thrombectomy for people who have acute ischaemic stroke and confirmed occlusion of the proximal anterior circulation demonstrated by computed tomographic angiography or magnetic resonance angiography. Secondary prevention includes the use of clopidogrel and dipyridamole. Carotid artery endarterectomy should only be considered if carotid stenosis is greater than 70% according to ECST criteria or greater than 50% according to NASCET criteria.
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This question is part of the following fields:
- Neurology
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Question 25
Incorrect
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A 50-year-old female with a history of Sjogren's syndrome presents to the gastroenterology clinic with elevated liver function tests. She reports experiencing fatigue and itching that has worsened over the past 3 months. On physical examination, her abdomen is soft, nontender, and without any organ enlargement. Laboratory results show a low hemoglobin level, normal platelet count and white blood cell count, elevated bilirubin, alkaline phosphatase, and gamma-glutamyl transferase levels, and positive anti-mitochondrial antibodies. What is the initial treatment recommended to halt the progression of her liver disease?
Your Answer:
Correct Answer: Ursodeoxycholic acid
Explanation:Primary biliary cholangitis is a chronic liver disease that primarily affects middle-aged women. It is characterized by the destruction of small bile ducts in the liver, leading to cholestasis and liver damage. The disease is diagnosed through blood tests that measure levels of specific antibodies and liver enzymes, which are highly specific to the condition. Ursodeoxycholic acid is the preferred treatment for slowing disease progression and improving symptoms, while cholestyramine can be used to alleviate itching but does not affect disease progression. In cases of decompensated liver disease, such as when bilirubin levels exceed 100, liver transplantation may be an option. Although recurrence in the graft can occur, it is typically not a significant issue. While fat-soluble vitamins can be supplemented, they are not a primary treatment option.
Primary Biliary Cholangitis: A Chronic Liver Disorder
Primary biliary cholangitis, previously known as primary biliary cirrhosis, is a chronic liver disorder that is commonly observed in middle-aged women. The exact cause of this condition is not yet fully understood, but it is believed to be an autoimmune disease. The disease is characterized by the progressive damage of interlobular bile ducts due to chronic inflammation, leading to cholestasis and eventually cirrhosis. The most common symptom of primary biliary cholangitis is itching in middle-aged women.
This condition is often associated with other autoimmune diseases such as Sjogren’s syndrome, rheumatoid arthritis, systemic sclerosis, and thyroid disease. Early symptoms of primary biliary cholangitis may be asymptomatic or may include fatigue, pruritus, and cholestatic jaundice. Late symptoms may progress to liver failure. Diagnosis of primary biliary cholangitis involves immunology tests such as anti-mitochondrial antibodies (AMA) M2 subtype and smooth muscle antibodies, as well as imaging tests to exclude an extrahepatic biliary obstruction.
The first-line treatment for primary biliary cholangitis is ursodeoxycholic acid, which slows down the progression of the disease and improves symptoms. Cholestyramine is used to alleviate pruritus, and fat-soluble vitamin supplementation is recommended. In severe cases, liver transplantation may be necessary, especially if bilirubin levels exceed 100. However, recurrence in the graft can occur, but it is not usually a problem. Complications of primary biliary cholangitis include cirrhosis, portal hypertension, ascites, variceal hemorrhage, osteomalacia, osteoporosis, and an increased risk of hepatocellular carcinoma.
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This question is part of the following fields:
- Gastroenterology/Nutrition
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Question 26
Incorrect
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A 65-year-old woman is brought to the emergency department by ambulance due to worsening shortness of breath and palpitations. Upon examination, bilateral crepitations are heard in her lungs and she has bilateral ankle edema. An ECG shows atrial fibrillation with a fast ventricular response, with a heart rate of 157 bpm. A chest x-ray reveals pulmonary edema. Blood tests show normal levels of Hb, platelets, WBC, Na+, K+, urea, creatinine, CRP, magnesium, troponin, and TSH. What is the most appropriate next step in managing this patient?
Your Answer:
Correct Answer: Synchronised DC cardioversion
Explanation:Patients who exhibit tachycardia along with symptoms of shock, syncope, myocardial ischaemia, or heart failure should be administered up to three synchronised DC shocks. Synchronised DC cardioversion is recommended for tachycardia with haemodynamic instability, signs of myocardial ischaemia, heart failure, or syncope. In this case, the patient is displaying signs of heart failure, and the elevated troponin levels are likely due to tachycardia rather than acute myocardial infarction (MI). Adenosine is not suitable for this situation as it is used to manage supraventricular tachycardia (SVT) that is not associated with shock, syncope, myocardial ischaemia, or heart failure. Amiodarone may be considered in atrial fibrillation with a fast ventricular response if synchronised DC cardioversion is ineffective, but it would not be the most appropriate management option at this time. IV metoprolol (or oral bisoprolol) is used in fast atrial fibrillation not associated with shock, syncope, myocardial ischaemia, or heart failure. However, since this patient is exhibiting signs of heart failure, this is not the correct course of action.
Management of Peri-Arrest Tachycardias
The Resuscitation Council (UK) guidelines for the management of peri-arrest tachycardias have been simplified in the 2015 update. The previous separate algorithms for broad-complex tachycardia, narrow complex tachycardia, and atrial fibrillation have been replaced by a unified treatment algorithm. After basic ABC assessment, patients are classified as stable or unstable based on the presence of adverse signs such as hypotension, pallor, sweating, confusion, or impaired consciousness. If any of these signs are present, synchronised DC shocks should be given, up to a maximum of three shocks.
The treatment following this is based on whether the QRS complex is narrow or broad and whether the rhythm is regular or irregular. For broad-complex tachycardia, a loading dose of amiodarone followed by a 24-hour infusion is given if the rhythm is regular. If the rhythm is irregular, expert help should be sought as it could be due to atrial fibrillation with bundle branch block, atrial fibrillation with ventricular pre-excitation, or torsade de pointes.
For narrow-complex tachycardia, vagal manoeuvres followed by IV adenosine are given if the rhythm is regular. If unsuccessful, atrial flutter is considered, and rate control is achieved with beta-blockers. If the rhythm is irregular, it is likely due to atrial fibrillation, and electrical or chemical cardioversion is considered if the onset is less than 48 hours. Beta-blockers are usually the first-line treatment for rate control unless contraindicated. The full treatment algorithm can be found on the Resuscitation Council website.
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This question is part of the following fields:
- Cardiovascular
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Question 27
Incorrect
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A 35-year-old para 2, gravida 3 is in labour in the delivery ward. The labour is progressing normally until the midwife calls the obstetrician to assess the patient. The cervix is dilated to 6 cm, and the baby's position is 2 cm above the ischial spine. The cardiotocography shows a slow but steady heartbeat. The obstetrician decides to perform an emergency category 2 caesarian section. What is the maximum time allowed between this decision and the delivery of the baby, given the indication?
Your Answer:
Correct Answer: 75 minutes
Explanation:Category 2 caesarean sections should be performed within 75 minutes of the decision being made. This is because these cases involve maternal or fetal compromise that is not immediately life-threatening, allowing the medical team to manage the emergency and plan the surgery to minimize risks to both the mother and the baby. A timeframe of 2 hours is incorrect as it would delay the necessary intervention. On the other hand, a timeframe of 30 minutes is only applicable to category 1 caesarean sections, where there is an immediate threat to the life of the mother or baby. A timeframe of 5 minutes is too short and may increase the risk of errors during the procedure.
Caesarean Section: Types, Indications, and Risks
Caesarean section, also known as C-section, is a surgical procedure that involves delivering a baby through an incision in the mother’s abdomen and uterus. In recent years, the rate of C-section has increased significantly due to an increased fear of litigation. There are two main types of C-section: lower segment C-section, which comprises 99% of cases, and classic C-section, which involves a longitudinal incision in the upper segment of the uterus.
C-section may be indicated for various reasons, including absolute cephalopelvic disproportion, placenta praevia grades 3/4, pre-eclampsia, post-maturity, IUGR, fetal distress in labor/prolapsed cord, failure of labor to progress, malpresentations, placental abruption, vaginal infection, and cervical cancer. The urgency of C-section may be categorized into four categories, with Category 1 being the most urgent and Category 4 being elective.
It is important for clinicians to inform women of the serious and frequent risks associated with C-section, including emergency hysterectomy, need for further surgery, admission to intensive care unit, thromboembolic disease, bladder injury, ureteric injury, and death. C-section may also increase the risk of uterine rupture, antepartum stillbirth, placenta praevia, and placenta accreta in subsequent pregnancies. Other complications may include persistent wound and abdominal discomfort, increased risk of repeat C-section, readmission to hospital, haemorrhage, infection, and fetal lacerations.
Vaginal birth after C-section (VBAC) may be an appropriate method of delivery for pregnant women with a single previous C-section delivery, except for those with previous uterine rupture or classical C-section scar. The success rate of VBAC is around 70-75%.
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This question is part of the following fields:
- Reproductive Medicine
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Question 28
Incorrect
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A 42-year-old female presents to the GP with a two-week history of feeling generally unwell. She reports experiencing hot flashes and sweating, as well as difficulty sleeping at night. Her husband has also noticed that she seems more agitated and on edge than usual. The patient has no significant medical history but reports having had flu-like symptoms six weeks ago that have since resolved. On examination, there is a tender goitre present. Thyroid function tests reveal a TSH level of 0.5 mU/L (normal range 0.5-5.5) and a free T4 level of 21 pmol/L (normal range 9.0-18). What is the first-line management for the most likely diagnosis?
Your Answer:
Correct Answer: Conservative management with ibuprofen
Explanation:Subacute (De Quervain’s) thyroiditis is the likely cause of this patient’s hyperthyroidism, as evidenced by symptoms such as heat intolerance, insomnia, and agitation, as well as a normal TSH and high T4 level. The presence of a tender goitre and recent viral illness further support this diagnosis. Conservative management, including observation and NSAIDs for pain relief, is the most appropriate course of action as subacute thyroiditis is typically self-limiting. Antithyroid drugs such as carbimazole and propylthiouracil are not indicated for this condition, as they are used to treat chronic hyperthyroidism such as Grave’s disease. Radioactive iodine therapy is also not appropriate for subacute thyroiditis.
Subacute Thyroiditis: A Self-Limiting Condition with Four Phases
Subacute thyroiditis, also known as De Quervain’s thyroiditis or subacute granulomatous thyroiditis, is a condition that is believed to occur after a viral infection. It is characterized by hyperthyroidism, a painful goitre, and raised ESR during the first phase, which lasts for 3-6 weeks. The second phase, which lasts for 1-3 weeks, is characterized by euthyroidism. The third phase, which can last for weeks to months, is characterized by hypothyroidism. Finally, in the fourth phase, the thyroid structure and function return to normal.
To diagnose subacute thyroiditis, thyroid scintigraphy is used to show a globally reduced uptake of iodine-131. However, most patients do not require treatment as the condition is self-limiting. Thyroid pain may respond to aspirin or other NSAIDs, but in more severe cases, steroids may be used, particularly if hypothyroidism develops.
It is important to note that subacute thyroiditis is just one of the many causes of thyroid dysfunction. A Venn diagram can be used to show how different causes of thyroid dysfunction may manifest. It is interesting to note that many causes of hypothyroidism may have an initial thyrotoxic phase. Proper diagnosis and management of thyroid dysfunction are crucial to ensure optimal patient outcomes.
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This question is part of the following fields:
- Endocrinology/Metabolic Disease
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Question 29
Incorrect
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A 35-year-old woman comes to the GP clinic for preconception counseling. She plans to conceive within the next 6 months. She has never been pregnant before and has a medical history of Type 1 diabetes mellitus and irritable bowel syndrome. She is currently taking insulin and has no known drug allergies. Her BMI is 22 kg/m2, and she does not smoke or drink alcohol. There is no family history of neural tube defects, and her partner has no history of neural tube defects. What is the recommended folic acid dosage for her?
Your Answer:
Correct Answer: Folic acid 5 mg once a day from now to 12 weeks of pregnancy
Explanation:If a woman has Type 1 diabetes mellitus, she is at a high risk of having a baby with neural tube defects. To prevent this, she should take 5mg of folic acid daily for three months before getting pregnant until the first 12 weeks of pregnancy. Any other dosage or duration of the regime would be incorrect for her.
Folic Acid: Importance, Deficiency, and Prevention
Folic acid is a vital nutrient that is converted to tetrahydrofolate (THF) in the body. It is found in green, leafy vegetables and plays a crucial role in the transfer of 1-carbon units to essential substrates involved in the synthesis of DNA and RNA. However, certain factors such as phenytoin, methotrexate, pregnancy, and alcohol excess can cause a deficiency in folic acid. This deficiency can lead to macrocytic, megaloblastic anemia and neural tube defects.
To prevent neural tube defects during pregnancy, it is recommended that all women take 400mcg of folic acid until the 12th week of pregnancy. Women at higher risk of conceiving a child with a neural tube defect should take 5mg of folic acid from before conception until the 12th week of pregnancy. Women are considered higher risk if they or their partner has a neural tube defect, they have had a previous pregnancy affected by a neural tube defect, or they have a family history of a neural tube defect. Additionally, women with certain medical conditions such as coeliac disease, diabetes, or thalassaemia trait, or those taking antiepileptic drugs, or who are obese (BMI of 30 kg/m2 or more) are also considered higher risk.
In summary, folic acid is an essential nutrient that plays a crucial role in DNA and RNA synthesis. Deficiency in folic acid can lead to serious health consequences, including neural tube defects. However, taking folic acid supplements during pregnancy can prevent these defects and ensure a healthy pregnancy.
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This question is part of the following fields:
- Reproductive Medicine
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Question 30
Incorrect
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A 25-year-old man presents to the emergency department with symptoms of nausea and vomiting. An F1 administers metoclopramide, but 20 minutes later the patient reports feeling as though his eyes are stuck in an abnormal position and he cannot move them. What is the likely cause of this man's symptoms?
Your Answer:
Correct Answer: Acute dystonia
Explanation:The administration of metoclopramide can result in extrapyramidal side effects, with acute dystonia being the earliest and most common. This can lead to oculogyric crises, particularly in young individuals. Long-term side effects may include akathisia, parkinsonism, and tardive dyskinesia. The patient’s history does not suggest an allergic reaction, as there were no symptoms such as facial or lip swelling, breathing or circulatory issues, or the presence of a rash.
Metoclopramide is a medication that is commonly used to manage nausea. It works by blocking D2 receptors in the chemoreceptor trigger zone, which helps to alleviate feelings of sickness. In addition to its antiemetic properties, metoclopramide also has other uses, such as treating gastro-oesophageal reflux disease and gastroparesis caused by diabetic neuropathy. It is often combined with analgesics to treat migraines, which can cause gastroparesis and slow the absorption of pain medication.
However, metoclopramide can have some adverse effects, such as extrapyramidal effects, acute dystonia, diarrhoea, hyperprolactinaemia, tardive dyskinesia, and parkinsonism. These side effects are particularly problematic in children and young adults. It is important to note that metoclopramide should not be used in cases of bowel obstruction, but it may be helpful in cases of paralytic ileus.
Although metoclopramide primarily works as a D2 receptor antagonist, its mechanism of action is quite complex. It also acts as a mixed 5-HT3 receptor antagonist and 5-HT4 receptor agonist. The antiemetic effects of metoclopramide are due to its D2 receptor antagonist activity in the chemoreceptor trigger zone, while its gastroprokinetic effects are mediated by both D2 receptor antagonist and 5-HT4 receptor agonist activity. At higher doses, the 5-HT3 receptor antagonist activity also comes into play.
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This question is part of the following fields:
- Pharmacology/Therapeutics
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