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  • Question 1 - An 85 kg 40-year-old man who is normally fit and well is scheduled...

    Incorrect

    • An 85 kg 40-year-old man who is normally fit and well is scheduled for an appendectomy today. He has been made nil by mouth, and surgeons expect him to continue to be nil by mouth for approximately 24 hours. The man has a past medical history of childhood asthma. He has been taking paracetamol for pain but takes no other regular medication. On examination, the man’s blood pressure (BP) is 110/80 mmHg and heart rate 65 bpm. His lungs are clear. Jugular venous pressure (JVP) is not raised, and he has no peripheral oedema. Skin turgor is normal.
      What is the appropriate fluid prescription for this man for the 24 hours while he is nil by mouth?

      Your Answer: 1 litre 5% dextrose with 20 mmol potassium over 8 hours; 1 litre 0.9% sodium chloride with 20 mmol potassium over 8 hours; 640 ml 0.9% sodium chloride with 20 mmol potassium over 8 hours

      Correct Answer: 1 litre 0.9% sodium chloride with 20 mmol potassium over 8 hours, 1 litre 5% dextrose with 20 mmol potassium over 8 hours; 500 ml 5% dextrose with 20 mmol potassium over 8 hours

      Explanation:

      Assessing and Prescribing Maintenance Fluids for a Euvolaemic Patient

      When assessing and prescribing maintenance fluids for a euvolaemic patient, it is important to consider their daily fluid and electrolyte requirements. As a general rule, a minimum of 30 ml/kg of fluid is required over a 24-hour period. In addition, the patient will require 0.5-1 mmol/kg/day of potassium for maintenance.

      A common prescription for maintenance fluids is 2´ sweet (5% dextrose) and 1´ salt (0.9% sodium chloride), or an equivalent volume of Hartmann’s solution. Accurate fluid balance monitoring and daily blood tests for electrolyte levels are also necessary.

      Several examples of fluid prescriptions are given, with explanations of why they may not be appropriate for a euvolaemic patient. These include prescriptions with excessive volumes of fluid, inappropriate types of fluid, and inadequate potassium replacement.

      Overall, careful consideration of a patient’s individual needs and regular monitoring are essential when prescribing maintenance fluids.

      Assessing and Prescribing Maintenance Fluids for a Euvolaemic Patient

    • This question is part of the following fields:

      • Surgery
      60.5
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  • Question 2 - A 65-year-old man presents with urinary problems. He has been passing very frequent...

    Incorrect

    • A 65-year-old man presents with urinary problems. He has been passing very frequent small amounts of urine and has also been getting up several times in the night to urinate.

      Upon examination, he has a smooth, non-enlarged prostate, and no abdominal masses. Further investigation rules out diabetes, infection, and urological malignancy. It is determined that his symptoms are due to an overactive bladder. Lifestyle advice is discussed, and he is referred for bladder training exercises.

      What should be the next course of action?

      Your Answer: Botulinum toxin injection

      Correct Answer: Oxybutynin

      Explanation:

      Antimuscarinic medications are effective in managing symptoms of overactive bladder. This condition is characterized by storage symptoms such as urinary urgency, frequency, and nocturia, often caused by detrusor overactivity. Oxybutynin is an example of an antimuscarinic drug that can increase bladder capacity by relaxing the detrusor’s smooth muscle, thereby reducing overactive bladder symptoms. Other antimuscarinic drugs include tolterodine and darifenacin. While botulinum toxin injection is an invasive treatment option for overactive bladder, it is not typically the first choice. Finasteride, a 5 alpha-reductase inhibitor, is not indicated for overactive bladder treatment as it is used to decrease prostate size in BPH patients. Mirabegron, a beta-3 adrenergic receptor agonist, can also relax the detrusor’s smooth muscle, but it is only recommended when antimuscarinic drugs are not effective or contraindicated due to side effects.

      Lower urinary tract symptoms (LUTS) are a common issue in men over the age of 50, with benign prostatic hyperplasia being the most common cause. However, other causes such as prostate cancer should also be considered. These symptoms can be classified into three groups: voiding, storage, and post-micturition. To properly manage LUTS, it is important to conduct a urinalysis to check for infection and haematuria, perform a digital rectal examination to assess the size and consistency of the prostate, and possibly conduct a PSA test after proper counselling. Patients should also complete a urinary frequency-volume chart and an International Prostate Symptom Score to guide management.

      For predominantly voiding symptoms, conservative measures such as pelvic floor muscle training, bladder training, and prudent fluid intake can be helpful. If symptoms are moderate or severe, an alpha-blocker may be offered. If the prostate is enlarged and the patient is at high risk of progression, a 5-alpha reductase inhibitor should be offered. If there are mixed symptoms of voiding and storage not responding to an alpha-blocker, an antimuscarinic drug may be added. For predominantly overactive bladder symptoms, moderating fluid intake and bladder retraining should be offered, and antimuscarinic drugs may be prescribed if symptoms persist. Mirabegron may be considered if first-line drugs fail. For nocturia, moderating fluid intake at night, furosemide 40 mg in the late afternoon, and desmopressin may be helpful.

    • This question is part of the following fields:

      • Surgery
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  • Question 3 - A 75-year-old man is scheduled for an elective knee replacement surgery the following...

    Incorrect

    • A 75-year-old man is scheduled for an elective knee replacement surgery the following day. He has type 2 diabetes and is the first patient on the surgery list. His doctor has advised him to continue taking his once-daily dose of metformin and his new anti-diabetic medication on the day of the operation. The patient's physician recently changed his diabetes medication due to hypoglycemic episodes with his previous medication. What is the most probable new antidiabetic medication he is taking?

      Your Answer: Empagliflozin

      Correct Answer: Sitagliptin

      Explanation:

      Patients undergoing surgery who are taking DPP-4 inhibitors (-gliptins) and GLP-1 analogues (-tides) can continue taking these medications as normal throughout the perioperative period. However, SGLT-2 blockers such as empagliflozin and dapagliflozin should be omitted on the day of surgery due to the increased risk of diabetic ketoacidosis during periods of dehydration and acute illness. Sulphonylureas like gliclazide should also be omitted until the patient is able to eat and drink again, as they can cause hypoglycaemia in patients who are in a fasted state. It is important to note that the patient in the case scenario may have been taking sulphonylureas in the past, but they are unlikely to be part of their current treatment regimen as they were discontinued by their GP due to side effects.

      Preparation for surgery varies depending on whether the patient is undergoing an elective or emergency procedure. For elective cases, it is important to address any medical issues beforehand through a pre-admission clinic. Blood tests, urine analysis, and other diagnostic tests may be necessary depending on the proposed procedure and patient fitness. Risk factors for deep vein thrombosis should also be assessed, and a plan for thromboprophylaxis formulated. Patients are advised to fast from non-clear liquids and food for at least 6 hours before surgery, and those with diabetes require special management to avoid potential complications. Emergency cases require stabilization and resuscitation as needed, and antibiotics may be necessary. Special preparation may also be required for certain procedures, such as vocal cord checks for thyroid surgery or bowel preparation for colorectal cases.

    • This question is part of the following fields:

      • Surgery
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  • Question 4 - Which tumour marker is most effective in detecting hepatocellular carcinoma? ...

    Correct

    • Which tumour marker is most effective in detecting hepatocellular carcinoma?

      Your Answer: Serum AFP

      Explanation:

      Liver Tumours: Types, Diagnosis, and Treatment

      Liver tumours can be classified as primary or metastatic. Primary liver tumours are relatively rare, with cholangiocarcinoma and hepatocellular carcinoma being the most common types. Hepatocellular carcinoma accounts for 75% of primary liver tumours and is often associated with chronic inflammatory activity, such as cirrhosis or chronic hepatitis B infection. Diagnosis is typically made through imaging modalities like CT or MRI, with elevated levels of a-fetoprotein being a common marker. Biopsy should be avoided as it can spread tumour cells. Treatment options include surgical resection, liver resection, transplantation, and tumour ablation. However, the poor overall survival rate of 15% at 5 years highlights the need for better treatment options.

      Cholangiocarcinoma is the second most common type of primary liver malignancy, with up to 80% of tumours arising in the extrahepatic biliary tree. Primary sclerosing cholangitis is a major risk factor, and patients typically present with jaundice. Diagnosis is made through liver function tests, imaging methods like CT or MRI, and elevated levels of tumour markers like CA 19-9, CEA, and CA 125. Surgical resection offers the best chance of cure, but local invasion of peri hilar tumours and lobar atrophy can often make it impossible. Palliation of jaundice is important, but metallic stents should be avoided in those considered for resection. The poor survival rate of approximately 5-10% 5 year survival highlights the need for better treatment options.

      In summary, liver tumours can be classified as primary or metastatic, with primary liver tumours being relatively rare. Hepatocellular carcinoma and cholangiocarcinoma are the most common types of primary liver tumours, with diagnosis typically made through imaging modalities and elevated tumour markers. Treatment options include surgical resection, liver resection, transplantation, and tumour ablation, but the poor overall survival rate highlights the need for better treatment options.

    • This question is part of the following fields:

      • Surgery
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  • Question 5 - A 40-year-old man visits the surgical outpatient clinic with a complaint of severe...

    Incorrect

    • A 40-year-old man visits the surgical outpatient clinic with a complaint of severe anal pain during and around defecation for the past 6 months. He has also noticed occasional fresh blood on the toilet paper after passing bowel motions. Despite trying laxatives, fibre, lubricants, topical nifedipine, and lignocaine on the advice of a general practitioner, his pain has not reduced. On examination, a significant 'split' in the mucosa just proximal to the anal verge is observed. A digital rectal exam is attempted but terminated due to intolerable discomfort. The patient denies any other changes to his bowel habits and is generally healthy. There is no significant past medical or family history. What is the most appropriate management for this patient?

      Your Answer: Sclerotherapy

      Correct Answer: Sphincterotomy

      Explanation:

      For patients with anal fissures that do not respond to conservative management, sphincterotomy may be considered as a last resort option. This is because it can release the painful spasm of the torn sphincter with a clean incision and speed up the healing process. Sclerotherapy is not effective for anal fissures, while the placement of a seton is only useful for anal fistulae. An endoscopy to rule out malignancy is unnecessary for patients under 50 years old with a clear cause for their bleeding and no other unexplained symptoms, as per NICE guidance (NG12). However, it may be necessary if bleeding persists after definitive management.

      Understanding Anal Fissures: Causes, Symptoms, and Treatment

      Anal fissures are tears in the lining of the distal anal canal that can be either acute or chronic. Acute fissures last for less than six weeks, while chronic fissures persist for more than six weeks. The most common risk factors for anal fissures include constipation, inflammatory bowel disease, and sexually transmitted infections such as HIV, syphilis, and herpes.

      Symptoms of anal fissures include painful, bright red rectal bleeding, with around 90% of fissures occurring on the posterior midline. If fissures are found in other locations, underlying causes such as Crohn’s disease should be considered.

      Management of acute anal fissures involves softening stool, dietary advice, bulk-forming laxatives, lubricants, topical anaesthetics, and analgesia. For chronic anal fissures, the same techniques should be continued, and topical glyceryl trinitrate (GTN) is the first-line treatment. If GTN is not effective after eight weeks, surgery (sphincterotomy) or botulinum toxin may be considered, and referral to secondary care is recommended.

      In summary, anal fissures can be a painful and uncomfortable condition, but with proper management, they can be effectively treated. It is important to identify and address underlying risk factors to prevent the development of chronic fissures.

    • This question is part of the following fields:

      • Surgery
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  • Question 6 - A 30-year-old female is being evaluated before an elective cholecystectomy due to two...

    Correct

    • A 30-year-old female is being evaluated before an elective cholecystectomy due to two severe episodes of biliary colic. She has a BMI of 28 kg/m² and smokes 2-3 cigarettes daily, but has no other medical conditions. She inquires about when she should discontinue her oral contraceptive pill. What is the recommended protocol?

      Your Answer: 4 weeks prior

      Explanation:

      It is important to consider the type of surgery the patient is undergoing when answering this question. In this case, the patient is having an elective procedure that requires general anesthesia and is a smoker and overweight, which are risk factors for blood clots. Therefore, it is recommended that she stop taking her oral contraceptive pill for four weeks prior to the surgery. However, if the surgery is being performed under local anesthesia, stopping the pill may not be necessary.

      Preparation for surgery varies depending on whether the patient is undergoing an elective or emergency procedure. For elective cases, it is important to address any medical issues beforehand through a pre-admission clinic. Blood tests, urine analysis, and other diagnostic tests may be necessary depending on the proposed procedure and patient fitness. Risk factors for deep vein thrombosis should also be assessed, and a plan for thromboprophylaxis formulated. Patients are advised to fast from non-clear liquids and food for at least 6 hours before surgery, and those with diabetes require special management to avoid potential complications. Emergency cases require stabilization and resuscitation as needed, and antibiotics may be necessary. Special preparation may also be required for certain procedures, such as vocal cord checks for thyroid surgery or bowel preparation for colorectal cases.

    • This question is part of the following fields:

      • Surgery
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  • Question 7 - A 35-year-old male patient complains of a painless lump in his right testicle....

    Incorrect

    • A 35-year-old male patient complains of a painless lump in his right testicle. What is the strongest association of testicular cancer?

      Your Answer: Smoking

      Correct Answer: Infertility

      Explanation:

      Men with infertility have a threefold increased risk of developing testicular cancer.

      Understanding Testicular Cancer

      Testicular cancer is a type of cancer that commonly affects men between the ages of 20 and 30. Germ-cell tumors are the most common type of testicular cancer, accounting for around 95% of cases. These tumors can be divided into seminomas and non-seminomas, which include embryonal, yolk sac, teratoma, and choriocarcinoma. Other types of testicular cancer include Leydig cell tumors and sarcomas. Risk factors for testicular cancer include infertility, cryptorchidism, family history, Klinefelter’s syndrome, and mumps orchitis.

      The most common symptom of testicular cancer is a painless lump, although some men may experience pain. Other symptoms may include hydrocele and gynaecomastia, which occurs due to an increased oestrogen:androgen ratio. Tumor markers such as hCG, AFP, and beta-hCG may be elevated in germ cell tumors. Ultrasound is the first-line diagnostic tool for testicular cancer.

      Treatment for testicular cancer depends on the type and stage of the tumor. Orchidectomy, chemotherapy, and radiotherapy may be used. Prognosis for testicular cancer is generally excellent, with a 5-year survival rate of around 95% for seminomas and 85% for teratomas if caught at Stage I. It is important for men to perform regular self-examinations and seek medical attention if they notice any changes or abnormalities in their testicles.

    • This question is part of the following fields:

      • Surgery
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  • Question 8 - A 50-year-old man comes to see his GP complaining of right-sided groin pain...

    Incorrect

    • A 50-year-old man comes to see his GP complaining of right-sided groin pain and swelling in his scrotum, which has been going on for four days. He also reports experiencing dysuria. He denies any recent trauma and states that he has unprotected sexual intercourse with his wife, who uses hormonal contraception.

      During the examination, the doctor notes that the patient's right hemiscrotum is tender and erythematosus. However, the pain is alleviated when the testis is elevated. The patient's vital signs are within normal limits, with a temperature of 37.1ºC, heart rate of 95 bpm, and blood pressure of 135/75 mmHg.

      What is the most appropriate diagnostic step for this patient's presentation?

      Your Answer: Ultrasound scan

      Correct Answer: Mid-stream sample of urine

      Explanation:

      The investigations for suspected epididymo-orchitis depend on the patient’s age. For sexually active younger adults, a nucleic acid amplification test (NAAT) for sexually transmitted infections (STIs) is recommended. However, for older adults with a low-risk sexual history, a mid-stream sample of urine (MSSU) is appropriate.

      This patient’s symptoms are consistent with epididymo-orchitis, which is characterized by groin pain, scrotal swelling, dysuria, and relief of pain when elevating the testis (Prehn’s sign). Testicular torsion is less likely due to the less acute onset of symptoms and the patient’s age.

      Given the patient’s age and sexual history, the most likely causative organism is enteric, such as Escherichia coli. However, a more thorough sexual history may be necessary to confirm this assumption. Therefore, the most appropriate next step is to take a mid-stream urine sample to guide management.

      It should be noted that a nucleic acid amplification test would be more appropriate for younger patients who are sexually active with multiple partners, as STIs are more likely in this demographic. However, based on the information provided in this question, an enteric cause is more likely for this patient.

      Epididymo-orchitis is a condition where the epididymis and/or testes become infected, leading to pain and swelling. It is commonly caused by infections spreading from the genital tract or bladder, with Chlamydia trachomatis and Neisseria gonorrhoeae being the usual culprits in sexually active younger adults, while E. coli is more commonly seen in older adults with a low-risk sexual history. Symptoms include unilateral testicular pain and swelling, with urethral discharge sometimes present. Testicular torsion, which can cause ischaemia of the testicle, is an important differential diagnosis and needs to be excluded urgently, especially in younger patients with severe pain and an acute onset.

      Investigations are guided by the patient’s age, with sexually transmitted infections being assessed in younger adults and a mid-stream urine (MSU) being sent for microscopy and culture in older adults with a low-risk sexual history. Management guidelines from the British Association for Sexual Health and HIV (BASHH) recommend ceftriaxone 500 mg intramuscularly as a single dose, plus doxycycline 100 mg orally twice daily for 10-14 days if the organism causing the infection is unknown. Further investigations are recommended after treatment to rule out any underlying structural abnormalities.

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      • Surgery
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  • Question 9 - A 75-year-old woman complains of mild lower back pain and tenderness around the...

    Incorrect

    • A 75-year-old woman complains of mild lower back pain and tenderness around the L3 vertebra. Upon conducting tests, the following results were obtained: Hemoglobin levels of 80 g/L (120-160), ESR levels of 110 mm/hr (1-10), and an albumin/globulin ratio of 1:2 (2:1). What is the probable diagnosis?

      Your Answer: Osteoarthritis

      Correct Answer: Multiple myeloma

      Explanation:

      Multiple Myeloma

      Multiple myeloma is a type of cancer that affects plasma cells found in the bone marrow. These plasma cells are derived from B lymphocytes, but when they become malignant, they start to divide uncontrollably, forming tumors in the bone marrow. These tumors interfere with normal cell production and erode the surrounding bone, causing soft spots and holes. Since the malignant cells are clones derived from a single plasma cell, they all produce the same abnormal immunoglobulin that is secreted into the blood.

      Patients with multiple myeloma may not show any symptoms for many years, but eventually, most patients develop some evidence of the disease. This can include weakened bones, which can cause bone pain and fractures, decreased numbers of red or white blood cells, which can lead to anemia, infections, bleeding, and bruising, and kidney failure, which can cause an increase in creatinine levels. Additionally, destruction of the bone can increase the level of calcium in the blood, leading to symptoms of hypercalcemia. Pieces of monoclonal antibodies, known as light chains or Bence Jones proteins, can also lodge in the kidneys and cause permanent damage. In some cases, an increase in the viscosity of the blood may lead to headaches.

    • This question is part of the following fields:

      • Surgery
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  • Question 10 - A 58-year-old man comes to see his GP with complaints of worsening urinary...

    Incorrect

    • A 58-year-old man comes to see his GP with complaints of worsening urinary symptoms. He reports frequent urges to urinate throughout the day and has experienced occasional incontinence. He denies any hesitancy, dribbling, or weak stream. Despite trying bladder retraining, he has seen little improvement.

      During the examination, the GP notes that the man's prostate is smooth, regular, and not enlarged. A recent PSA test came back normal. The patient has no medical history and is not taking any regular medications.

      What is the most appropriate course of action for managing this patient's symptoms?

      Your Answer: Finasteride

      Correct Answer: Oxybutynin

      Explanation:

      Antimuscarinic drugs are a recommended treatment for patients experiencing an overactive bladder, which is characterized by storage symptoms like urgency and frequency without any voiding symptoms. If lifestyle measures and bladder training fail to alleviate symptoms, the next step is to try an antimuscarinic agent like oxybutynin, which works by blocking contractions of the detrusor muscle. Finasteride, a 5-alpha reductase inhibitor, is not suitable for this patient as it is used to treat benign prostatic hyperplasia and associated voiding symptoms. Furosemide, which increases urine production during the day and reduces it at night, is not appropriate for this patient as he does not have nocturia and it may even worsen his overactive bladder symptoms. Mirabegron, a beta-3 agonist that relaxes the detrusor muscle and increases bladder storage capacity, is a second-line medication used if antimuscarinics are not effective or well-tolerated.

      Lower urinary tract symptoms (LUTS) are a common issue in men over the age of 50, with benign prostatic hyperplasia being the most common cause. However, other causes such as prostate cancer should also be considered. These symptoms can be classified into three groups: voiding, storage, and post-micturition. To properly manage LUTS, it is important to conduct a urinalysis to check for infection and haematuria, perform a digital rectal examination to assess the size and consistency of the prostate, and possibly conduct a PSA test after proper counselling. Patients should also complete a urinary frequency-volume chart and an International Prostate Symptom Score to guide management.

      For predominantly voiding symptoms, conservative measures such as pelvic floor muscle training, bladder training, and prudent fluid intake can be helpful. If symptoms are moderate or severe, an alpha-blocker may be offered. If the prostate is enlarged and the patient is at high risk of progression, a 5-alpha reductase inhibitor should be offered. If there are mixed symptoms of voiding and storage not responding to an alpha-blocker, an antimuscarinic drug may be added. For predominantly overactive bladder symptoms, moderating fluid intake and bladder retraining should be offered, and antimuscarinic drugs may be prescribed if symptoms persist. Mirabegron may be considered if first-line drugs fail. For nocturia, moderating fluid intake at night, furosemide 40 mg in the late afternoon, and desmopressin may be helpful.

    • This question is part of the following fields:

      • Surgery
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  • Question 11 - A 40-year-old male visits his GP complaining of a painless lump in his...

    Incorrect

    • A 40-year-old male visits his GP complaining of a painless lump in his testicle that has been present for a month. After an ultrasound, the GP refers him to the hospital for suspected testicular cancer. The patient undergoes an orchidectomy and is diagnosed with stage 1 seminoma. What is the most likely tumour marker to be elevated in this patient?

      Your Answer: PSA

      Correct Answer: HCG

      Explanation:

      Seminomas are often associated with elevated levels of LDH.
      Prostate cancer is frequently accompanied by an increase in PSA.
      Colorectal cancer is most commonly linked to elevated levels of CEA.
      Melanomas and schwannomas often result in elevated levels of S-100.

      Understanding Testicular Cancer

      Testicular cancer is a type of cancer that commonly affects men between the ages of 20 and 30. Germ-cell tumors are the most common type of testicular cancer, accounting for around 95% of cases. These tumors can be divided into seminomas and non-seminomas, which include embryonal, yolk sac, teratoma, and choriocarcinoma. Other types of testicular cancer include Leydig cell tumors and sarcomas. Risk factors for testicular cancer include infertility, cryptorchidism, family history, Klinefelter’s syndrome, and mumps orchitis.

      The most common symptom of testicular cancer is a painless lump, although some men may experience pain. Other symptoms may include hydrocele and gynaecomastia, which occurs due to an increased oestrogen:androgen ratio. Tumor markers such as hCG, AFP, and beta-hCG may be elevated in germ cell tumors. Ultrasound is the first-line diagnostic tool for testicular cancer.

      Treatment for testicular cancer depends on the type and stage of the tumor. Orchidectomy, chemotherapy, and radiotherapy may be used. Prognosis for testicular cancer is generally excellent, with a 5-year survival rate of around 95% for seminomas and 85% for teratomas if caught at Stage I. It is important for men to perform regular self-examinations and seek medical attention if they notice any changes or abnormalities in their testicles.

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      • Surgery
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  • Question 12 - A 65-year-old man comes to the Emergency Department with severe abdominal pain and...

    Incorrect

    • A 65-year-old man comes to the Emergency Department with severe abdominal pain and haematemesis. Following initial resuscitation, an urgent CT scan shows a perforated duodenal ulcer. The surgical team schedules an emergency laparotomy, and he is transferred to the operating room. Due to his non-fasted state, the anaesthetist intends to perform a rapid sequence induction (RSI) using a depolarising muscle relaxant to minimize airway obstruction.
      What is the appropriate drug to use in this situation?

      Your Answer: Pancuronium

      Correct Answer: Suxamethonium

      Explanation:

      Suxamethonium belongs to the category of depolarising muscle relaxants, which is one of the two main categories of muscle relaxants used in anaesthesia. The other category is non-depolarising muscle relaxants. Therefore, suxamethonium is the correct answer out of the given options. Rocuronium, mivacurium, and pancuronium are all examples of non-depolarising muscle relaxants and are incorrect options. Sugammadex is used for reversing neuromuscular blockade caused by rocuronium and vecuronium and is also an incorrect answer.

      Muscle relaxants are drugs that can be used to induce paralysis in patients undergoing surgery or other medical procedures. Suxamethonium is a type of muscle relaxant that works by inhibiting the action of acetylcholine at the neuromuscular junction. It is broken down by plasma cholinesterase and acetylcholinesterase and has the fastest onset and shortest duration of action of all muscle relaxants. However, it can cause adverse effects such as hyperkalaemia, malignant hyperthermia, and lack of acetylcholinesterase.

      Atracurium is another type of muscle relaxant that is a non-depolarising neuromuscular blocking drug. It usually has a duration of action of 30-45 minutes and may cause generalised histamine release on administration, which can produce facial flushing, tachycardia, and hypotension. Unlike suxamethonium, atracurium is not excreted by the liver or kidney but is broken down in tissues by hydrolysis. Its effects can be reversed by neostigmine.

      Vecuronium is also a non-depolarising neuromuscular blocking drug that has a duration of action of approximately 30-40 minutes. Its effects may be prolonged in patients with organ dysfunction as it is degraded by the liver and kidney. Similarly, its effects can be reversed by neostigmine.

      Pancuronium is a non-depolarising neuromuscular blocker that has an onset of action of approximately 2-3 minutes and a duration of action of up to 2 hours. Its effects may be partially reversed with drugs such as neostigmine. Overall, muscle relaxants are important drugs in medical practice, but their use requires careful consideration of their potential adverse effects and appropriate monitoring of patients.

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      • Surgery
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  • Question 13 - A 26-year-old man presents to the emergency department (ED) after hitting his head...

    Incorrect

    • A 26-year-old man presents to the emergency department (ED) after hitting his head on a low-hanging branch while hiking 3 hours ago. He recalls feeling dizzy and disoriented immediately after the incident but has since felt fine.

      Upon examination, the patient has a small bump on his head and a mild headache. His neurological exam is normal, and his GCS is 15. He reports feeling nauseous but has not vomited since the incident.

      The patient has no significant medical history and is not taking any medications.

      What is the recommended course of action for managing this patient?

      Your Answer: Skull x-ray

      Correct Answer: CT head within 1 hour

      Explanation:

      If a person experiences more than one episode of vomiting after a head injury, it is necessary to perform a CT head within 1 hour to check for any intracranial pathology. This is the case for a 24-year-old man who has presented to the emergency department with a severe head injury and multiple vomiting episodes. Other criteria for an urgent CT head within 1 hour include evidence of basal skull fracture, depressed skull fractures, and altered GCS. Admitting the patient for neuro-observations only is not appropriate, as a CT head is necessary to rule out any intracranial pathology. Similarly, a CT head within 8 hours is not appropriate for this patient, as it is indicated for head injuries with altered consciousness or amnesia following the event. Discharging the patient with safety netting is also not appropriate, as the patient is experiencing repeated vomiting after a head injury, which requires urgent CT head imaging within 1 hour.

      NICE Guidelines for Investigating Head Injuries in Adults

      Head injuries can be serious and require prompt medical attention. The National Institute for Health and Care Excellence (NICE) has provided clear guidelines for healthcare professionals to determine which adult patients need further investigation with a CT head scan. Patients who require immediate CT head scans include those with a Glasgow Coma Scale (GCS) score of less than 13 on initial assessment, suspected open or depressed skull fractures, signs of basal skull fractures, post-traumatic seizures, focal neurological deficits, and more than one episode of vomiting.

      For patients with any loss of consciousness or amnesia since the injury, a CT head scan within 8 hours is recommended for those who are 65 years or older, have a history of bleeding or clotting disorders, experienced a dangerous mechanism of injury, or have more than 30 minutes of retrograde amnesia of events immediately before the head injury. Additionally, patients on warfarin who have sustained a head injury without other indications for a CT head scan should also receive a scan within 8 hours of the injury.

      It is important for healthcare professionals to follow these guidelines to ensure that patients receive appropriate and timely care for their head injuries. By identifying those who require further investigation, healthcare professionals can provide the necessary treatment and support to prevent further complications and improve patient outcomes.

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      • Surgery
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  • Question 14 - A 55-year-old woman with ulcerative colitis and primary sclerosing cholangitis visits her GP...

    Incorrect

    • A 55-year-old woman with ulcerative colitis and primary sclerosing cholangitis visits her GP complaining of colicky abdominal pain and pruritus that has persisted despite taking ursodeoxycholic acid. She also reports unintentional weight loss of 5kg over two months. During the examination, the patient appears mildly jaundiced and a mass is palpable in the right hypochondrium. What screening test can be performed to detect the probable malignancy?

      Your Answer: Beta-hCG

      Correct Answer: CA 19-9

      Explanation:

      Understanding Cholangiocarcinoma

      Cholangiocarcinoma, also known as bile duct cancer, is a type of cancer that affects the bile ducts. The main risk factor for this type of cancer is primary sclerosing cholangitis. Symptoms of cholangiocarcinoma include persistent biliary colic, anorexia, jaundice, and weight loss. A palpable mass in the right upper quadrant, known as the Courvoisier sign, may also be present. Additionally, periumbilical lymphadenopathy, known as Sister Mary Joseph nodes, and left supraclavicular adenopathy, known as Virchow node, may be seen. CA 19-9 levels are often used to detect cholangiocarcinoma in patients with primary sclerosing cholangitis. It is important to be aware of these symptoms and risk factors in order to detect and treat cholangiocarcinoma early.

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      • Surgery
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  • Question 15 - A 50-year-old man with a caecal carcinoma undergoes a laparotomy with right hemicolectomy....

    Incorrect

    • A 50-year-old man with a caecal carcinoma undergoes a laparotomy with right hemicolectomy. Four weeks later, he presents to the Surgical Outpatient Clinic with a persistent sinus in his midline laparotomy scar.
      Which of the following conditions is most likely to be associated with poor wound healing?

      Your Answer: Non-steroidal anti-inflammatory drugs

      Correct Answer: Adjuvant radiotherapy

      Explanation:

      Factors Affecting Wound Healing: Adjuvant Radiotherapy, High Tension Sutures, Skin Closure Material, Medications, and Nutrient Deficiencies

      Wound healing can be influenced by various factors, including adjuvant radiotherapy, high tension sutures, skin closure material, medications, and nutrient deficiencies. Adjuvant radiotherapy is often used postoperatively to reduce the risk of recurrence, but it can also delay wound healing and cause complications such as fibrosis and stricture formation. High tension sutures can support wound healing, but if placed with too much tension, they can lead to tissue strangulation and necrosis. Skin closure material should be removed at the appropriate time to prevent wound dehiscence. Non-steroidal anti-inflammatory drugs have not been shown to have a significant effect on wound healing, but steroids and other immunosuppressive drugs can impair it. Finally, nutrient deficiencies, particularly of vitamins A, C, and E and zinc, can also impact wound healing.

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  • Question 16 - A 27-year-old male is hit on the side of his head above the...

    Incorrect

    • A 27-year-old male is hit on the side of his head above the ear by a golf ball traveling at high speed. He briefly loses consciousness, regains it, but then gradually loses consciousness again. He is rushed to the emergency department where a CT scan of his head reveals an extradural hematoma on the right side. Upon examination, it is observed that his right pupil is dilated and unresponsive. Which cranial nerve is being compressed to account for his pupillary abnormality?

      Your Answer: 4

      Correct Answer: 3

      Explanation:

      Understanding Brain Herniation

      Brain herniation is a condition that occurs when the intracranial pressure rises to pathological levels, causing normal brain structures to be forcefully displaced. This displacement of the brain can lead to the compression of important structures, with the brain stem being the most critical. When the brain stem is compressed, it is referred to as ‘coning,’ which is a severe sign that requires immediate medical attention. The treatment for brain herniation may involve osmotherapy with hypertonic saline or mannitol, or surgical decompression.

      There are different types of brain herniation, including subfalcine, central, transtentorial/uncal herniation, tonsillar, and transcalvarial. Subfalcine herniation occurs when the cingulate gyrus is displaced under the falx cerebri. Central herniation, on the other hand, involves the downward displacement of the brain. Transtentorial/uncal herniation is characterized by the displacement of the uncus of the temporal lobe under the tentorium cerebelli, which can cause an ipsilateral fixed, dilated pupil and contralateral paralysis. Tonsillar herniation occurs when the cerebellar tonsils are displaced through the foramen magnum, leading to compression of the cardiorespiratory center. Finally, transcalvarial herniation occurs when the brain is displaced through a defect in the skull, such as a fracture or craniotomy site. Understanding the different types of brain herniation is crucial in diagnosing and treating this condition.

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  • Question 17 - A father on the pediatric ward tells the doctor that his 2-year-old child...

    Incorrect

    • A father on the pediatric ward tells the doctor that his 2-year-old child has been having trouble with their feeds and has been vomiting a green substance. The child was born at term via vaginal delivery. On examination, the abdomen is soft but appears to be distended. An abdominal x-ray is ordered, which shows a 'double bubble' sign. What is the most probable diagnosis?

      Your Answer: Necrotising enterocolitis

      Correct Answer: Intestinal atresia

      Explanation:

      The most likely cause of bilious vomiting on the first day of life is intestinal atresia. This is because the presence of bilious vomiting in early life suggests a bowel obstruction, and the fact that it has occurred on the first day of life indicates an underlying structural issue. Children with Down’s syndrome are at a higher risk of developing this condition, especially at the duodenum. The diagnosis of intestinal/duodenal atresia is further supported by the presence of the ‘double bubble’ on the x-ray.

      Biliary atresia is an incorrect answer as it would not cause the clinical picture described above. This condition results in neonatal jaundice beyond 14 days of life, with dark urine and pale stools.

      Malrotation with volvulus is also an incorrect answer. While it can cause bilious vomiting, it tends to present around 3 to 7 days following birth.

      Necrotising enterocolitis is another incorrect answer. Although it can cause bilious vomiting, it typically does not occur so early following birth. Additionally, it is usually a condition of prematurity and is rarely seen in infants born at term.

      Causes and Treatments for Bilious Vomiting in Neonates

      Bilious vomiting in neonates can be caused by various disorders, including duodenal atresia, malrotation with volvulus, jejunal/ileal atresia, meconium ileus, and necrotising enterocolitis. Duodenal atresia occurs in 1 in 5000 births and is more common in babies with Down syndrome. It typically presents a few hours after birth and can be diagnosed through an abdominal X-ray that shows a double bubble sign. Treatment involves duodenoduodenostomy. Malrotation with volvulus is usually caused by incomplete rotation during embryogenesis and presents between 3-7 days after birth. An upper GI contrast study or ultrasound can confirm the diagnosis, and treatment involves Ladd’s procedure. Jejunal/ileal atresia is caused by vascular insufficiency in utero and occurs in 1 in 3000 births. It presents within 24 hours of birth and can be diagnosed through an abdominal X-ray that shows air-fluid levels. Treatment involves laparotomy with primary resection and anastomosis. Meconium ileus occurs in 15-20% of babies with cystic fibrosis and presents in the first 24-48 hours of life with abdominal distension and bilious vomiting. Diagnosis involves an abdominal X-ray that shows air-fluid levels, and a sweat test can confirm cystic fibrosis. Treatment involves surgical decompression, and segmental resection may be necessary for serosal damage. Necrotising enterocolitis occurs in up to 2.4 per 1000 births, with increased risks in prematurity and inter-current illness. It typically presents in the second week of life and can be diagnosed through an abdominal X-ray that shows dilated bowel loops, pneumatosis, and portal venous air. Treatment involves conservative and supportive measures for non-perforated cases, while laparotomy and resection are necessary for perforated cases or ongoing clinical deterioration.

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  • Question 18 - A 27-year-old woman comes to the clinic eight weeks after giving birth with...

    Incorrect

    • A 27-year-old woman comes to the clinic eight weeks after giving birth with a painful, swollen, and red right breast. During the examination, there is fluctuance in the upper outer quadrant of the right breast near the nipple areolar complex. The overlying skin is tender and red. What is the best course of action for this patient?

      Your Answer: Incision and drainage

      Correct Answer: Ultrasound guided needle aspiration followed by antibiotics

      Explanation:

      Post-Partum Breast Abscess in Breastfeeding Mothers

      Post-partum breast abscess is a common occurrence in breastfeeding mothers. It is caused by Staphylococcus aureus, which enters through cracks in the nipple-areolar complex. The abscesses are usually located peripherally and can also occur during weaning due to breast engorgement or the child developing teeth. Early infections can be treated with antibiotics, but when pus forms, ultrasound-guided needle aspiration is the preferred treatment. Mammography is not recommended as it requires compression of the painful breast. Surgical incision and drainage are only necessary if the abscess is very loculated, fails to respond to repeated guided aspirations, or if the overlying skin is necrotic. It is important to seek medical attention promptly to prevent complications. For further information, refer to Dixon JM’s article on breast infection in the BMJ.

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  • Question 19 - A 50-year-old man comes to the emergency department complaining of sudden abdominal pain....

    Incorrect

    • A 50-year-old man comes to the emergency department complaining of sudden abdominal pain. He denies any history of diarrhea, constipation, nausea, or vomiting. His vital signs are as follows: temperature 37.5ºC, heart rate 110 bpm, and blood pressure 140/80 mmHg. Upon examination, he reports epigastric pain that radiates to his right shoulder and back, and there is shifting dullness. The following investigations are conducted:

      - Hemoglobin (Hb) level: 140 g/L (normal range: 135-180)
      - Platelet count: 300 * 109/L (normal range: 150 - 400)
      - White blood cell (WBC) count: 11.3 * 109/L (normal range: 4.0 - 11.0)
      - Lipase level: 200 U/L (normal range: 13 - 60)
      - Bilirubin level: 18 µmol/L (normal range: 3 - 17)
      - Alkaline phosphatase (ALP) level: 106 u/L (normal range: 30 - 100)
      - Alanine aminotransferase (ALT) level: 32 u/L (normal range: 3 - 40)

      What is the most appropriate next step in managing his likely diagnosis?

      Your Answer: Consider percutaneous endoscopic gastrostomy (PEG) tube and keep nil-by mouth

      Correct Answer: Encourage nutrition orally as tolerated and do not keep nil-by mouth

      Explanation:

      Managing Acute Pancreatitis in a Hospital Setting

      Acute pancreatitis is a serious condition that requires management in a hospital setting. The severity of the condition can be stratified based on the presence of organ failure and local complications. Key aspects of care include fluid resuscitation, aggressive early hydration with crystalloids, and adequate pain management with intravenous opioids. Patients should not be made ‘nil-by-mouth’ unless there is a clear reason, and enteral nutrition should be offered within 72 hours of presentation. Antibiotics should not be used prophylactically, but may be indicated in cases of infected pancreatic necrosis. Surgery may be necessary for patients with acute pancreatitis due to gallstones or obstructed biliary systems, and those with infected necrosis may require radiological drainage or surgical necrosectomy.

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  • Question 20 - A 50-year-old man is involved in a high-speed car accident and suffers from...

    Incorrect

    • A 50-year-old man is involved in a high-speed car accident and suffers from severe injuries. During the initial assessment, it is discovered that he has free fluid in his abdominal cavity on FAST scan. Due to his unstable condition, he is taken to the operating theatre for laparotomy. The surgeons identify the main sources of bleeding in the mesentery of the small bowel and tie them off. The injured sections of the small bowel are stapled off but not reanastamosed. However, there are multiple tiny areas of bleeding, especially in the wound edges, which the surgeons refer to as a general ooze. The abdomen is closed, and the patient is admitted to the intensive care unit. The surgeons plan to return to the theatre to repair the small bowel 24 hours later when the patient is more stable. What is the principle of damage control laparotomy?

      Your Answer: Laparotomy performed when there is acidosis

      Correct Answer: Laparotomy performed to restore normal physiology

      Explanation:

      Damage Control Laparotomy: A Life-Saving Procedure

      Damage control laparotomy is a surgical procedure performed when prolonged surgery would further deteriorate the patient’s physiology. Patients who require this procedure often present with a triad of acidosis, hypothermia, and coagulopathy. The primary goal of this procedure is to stop life-threatening bleeding and reduce contamination, rather than reconstructing damaged tissue and reanastomosing the bowel. For instance, the surgeon may staple off a perforated bowel to prevent further contamination.

      After the abbreviated laparotomy for damage control, the patient is transferred to the intensive care unit for resuscitation. The medical team focuses on correcting the patient’s abnormal physiology, such as warming up the patient and correcting coagulopathy. The patient is closely monitored until their physiology is closer to normal, which usually takes 24 to 48 hours.

      Once the patient’s physiology has improved, the surgeon performs an operation to reconstruct the anatomy. This approach allows the patient to recover from the initial surgery and stabilize before undergoing further procedures. Damage control laparotomy is a life-saving procedure that can prevent further deterioration of the patient’s condition and increase their chances of survival.

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