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  • Question 1 - A 54-year-old man presents to the emergency department with complaints of nausea and...

    Incorrect

    • A 54-year-old man presents to the emergency department with complaints of nausea and vomiting that started 3 hours ago. The vomit contains some food content but no blood. He also reports experiencing abdominal pain, but is unable to pinpoint the location. On examination, his heart rate is 90 beats per minute, respiratory rate is 20 breaths per minute, and blood pressure is 140/88 mmHg. The emergency physician observes that he has red palms and ascites in his abdomen. The following blood results are obtained:

      - Hemoglobin: 128 g/L
      - Aspartate aminotransferase (AST): 82 U/L
      - Alanine aminotransferase (ALT): 38 U/L

      Further questioning reveals that the man used to engage in binge drinking and currently consumes more than 60 units of alcohol per week since his divorce 15 years ago and recent job loss. Based on this information, what pathological feature is likely to be observed on liver biopsy?

      Your Answer: Mononuclear infiltration of liver lobules with hepatocytes necrosis and Kupffer cells hyperplasia

      Correct Answer: Excess collagen and extracellular matrix deposition in periportal and pericentral zones leading to the formation of regenerative nodules

      Explanation:

      Patients with this condition typically exhibit the presence of anti-mitochondrial antibodies.

      Scoring Systems for Liver Cirrhosis

      Liver cirrhosis is a serious condition that can lead to liver failure and death. To assess the severity of the disease, doctors use scoring systems such as the Child-Pugh classification and the Model for End-Stage Liver Disease (MELD). The Child-Pugh classification takes into account five factors: bilirubin levels, albumin levels, prothrombin time, encephalopathy, and ascites. Each factor is assigned a score of 1 to 3, depending on its severity, and the scores are added up to give a total score. The total score is then used to grade the severity of the disease as A, B, or C.

      The MELD system uses a formula that takes into account a patient’s bilirubin, creatinine, and international normalized ratio (INR) to predict their survival. The formula calculates a score that ranges from 6 to 40, with higher scores indicating a higher risk of mortality. The MELD score is particularly useful for patients who are on a liver transplant waiting list, as it helps to prioritize patients based on their risk of mortality. Overall, both the Child-Pugh classification and the MELD system are important tools for assessing the severity of liver cirrhosis and determining the best course of treatment for patients.

    • This question is part of the following fields:

      • Gastrointestinal System
      97.4
      Seconds
  • Question 2 - A 44-year-old man was admitted to the emergency department with facial swelling and...

    Correct

    • A 44-year-old man was admitted to the emergency department with facial swelling and difficulty breathing. Stridor and dilated neck veins were observed on examination. A CT scan revealed a mass obstructing the superior vena cava, which was later confirmed to be non-Hodgkin lymphoma. The patient received initial chemotherapy treatment for the lymphoma.

      After five weeks, he returned to the emergency department complaining of a tingling and painful sensation in his hands and feet bilaterally. Additionally, he was observed to have a high steppage gait. What is the most likely cause of his symptoms during his second visit to the emergency department?

      Your Answer: Vincristine

      Explanation:

      The standard chemotherapy regimen for non-Hodgkin lymphoma is R-CHOP, which includes Rituximab (in certain patients), cyclophosphamide, hydroxydaunorubicin, Oncovin (vincristine), and prednisolone. However, one of the significant side effects of vincristine is chemotherapy-induced peripheral neuropathy, which can cause tingling or numbness starting from the extremities. It can also lead to severe neuropathic pain and distal weakness, such as foot drop.

      While Rituximab can cause adverse effects such as cardiotoxicity and infections, it is not commonly associated with neurological effects. Cyclophosphamide, on the other hand, can cause chemotherapy-induced nausea and vomiting, bone marrow suppression, and haemorrhagic cystitis due to its toxicity to the bladder epithelium.

      Hydroxydaunorubicin is known to cause dilated cardiomyopathy, which can lead to heart failure and has a high mortality rate.

      Cytotoxic agents are drugs that are used to kill cancer cells. There are several types of cytotoxic agents, each with their own mechanism of action and potential adverse effects. Alkylating agents, such as cyclophosphamide, work by causing cross-linking in DNA. However, they can also cause haemorrhagic cystitis, myelosuppression, and transitional cell carcinoma. Cytotoxic antibiotics, like bleomycin and anthracyclines, degrade preformed DNA and stabilize DNA-topoisomerase II complex, respectively. However, they can also cause lung fibrosis and cardiomyopathy. Antimetabolites, such as methotrexate and fluorouracil, inhibit dihydrofolate reductase and thymidylate synthesis, respectively. However, they can also cause myelosuppression, mucositis, and liver or lung fibrosis. Drugs that act on microtubules, like vincristine and docetaxel, inhibit the formation of microtubules and prevent microtubule depolymerisation & disassembly, respectively. However, they can also cause peripheral neuropathy, myelosuppression, and paralytic ileus. Topoisomerase inhibitors, like irinotecan, inhibit topoisomerase I, which prevents relaxation of supercoiled DNA. However, they can also cause myelosuppression. Other cytotoxic drugs, such as cisplatin and hydroxyurea, cause cross-linking in DNA and inhibit ribonucleotide reductase, respectively. However, they can also cause ototoxicity, peripheral neuropathy, hypomagnesaemia, and myelosuppression.

    • This question is part of the following fields:

      • Haematology And Oncology
      79.5
      Seconds
  • Question 3 - Which statement accurately describes the results of a randomised controlled trial comparing the...

    Correct

    • Which statement accurately describes the results of a randomised controlled trial comparing the effectiveness of drug A and drug B in treating diabetes mellitus, where 100 patients were assigned to each group and the HbA1c levels were 72 mmol/mol in group A and 61 mmol/mol in group B with a p-value of 0.08?

      Your Answer: The 95% confidence intervals of the HbA1c for group A and group B likely overlapped

      Explanation:

      Statistical Significance and Confidence Intervals

      When conducting statistical analyses, it is important to understand the concepts of statistical significance and confidence intervals. In general, statistical significance refers to the likelihood that the results of a study are not due to chance. This is typically determined by calculating a p value, which represents the probability of obtaining the observed results if the null hypothesis (i.e., no difference between groups) is true. If the p value is below a predetermined level of significance (usually 0.05 or 0.01), the results are considered statistically significant.

      Confidence intervals, on the other hand, provide a range of values within which the true population parameter (e.g., mean, proportion) is likely to fall. The width of the confidence interval is determined by the level of confidence (e.g., 95%, 90%) and the variability of the data. A narrower confidence interval indicates greater precision in the estimate.

      In the given statements, it is suggested that the p value and confidence intervals can provide insight into the likelihood of differences between groups. Specifically, if the p value is above 0.05, it is likely that the confidence intervals of the two groups overlap. Additionally, a 90% confidence interval will generally be narrower than a 95% confidence interval. Finally, if the p value is below 0.1, it is suggested that the 90% confidence intervals did not overlap, indicating a greater likelihood of differences between groups. However, it is important to note that the power of the study (i.e., the ability to detect true differences) is not known, so the possibility of a type II error (i.e., failing to detect a true difference) cannot be ruled out.

    • This question is part of the following fields:

      • Clinical Sciences
      33.6
      Seconds
  • Question 4 - Which muscle is innervated by the superficial peroneal nerve? ...

    Correct

    • Which muscle is innervated by the superficial peroneal nerve?

      Your Answer: Peroneus brevis

      Explanation:

      Anatomy of the Superficial Peroneal Nerve

      The superficial peroneal nerve is responsible for supplying the lateral compartment of the leg, specifically the peroneus longus and peroneus brevis muscles which aid in eversion and plantar flexion. It also provides sensation over the dorsum of the foot, excluding the first web space which is innervated by the deep peroneal nerve.

      The nerve passes between the peroneus longus and peroneus brevis muscles along the proximal one-third of the fibula. Approximately 10-12 cm above the tip of the lateral malleolus, the nerve pierces the fascia. It then bifurcates into intermediate and medial dorsal cutaneous nerves about 6-7 cm distal to the fibula.

      Understanding the anatomy of the superficial peroneal nerve is important in diagnosing and treating conditions that affect the lateral compartment of the leg and dorsum of the foot. Injuries or compression of the nerve can result in weakness or numbness in the affected areas.

    • This question is part of the following fields:

      • Neurological System
      26.5
      Seconds
  • Question 5 - A 55-year-old male presents to the emergency department with a high fever and...

    Incorrect

    • A 55-year-old male presents to the emergency department with a high fever and fatigue. He does not have any history to offer. On examination, he is noted to have splinter haemorrhages and conjunctival pallor. His observations show him to be pyrexial at 39°C. A pansystolic murmur is audible throughout the praecordium, and an echocardiogram reveals vegetations. He is diagnosed with infective endocarditis and initiated on a triple antibiotic therapy of gentamicin, vancomycin and amoxicillin. The following U&E results are noted at admission:

      Na+ 140 mmol/L (135 - 145)
      K+ 4.0 mmol/L (3.5 - 5.0)
      Bicarbonate 25 mmol/L (22 - 29)
      Urea 4.0 mmol/L (2.0 - 7.0)
      Creatinine 75 µmol/L (55 - 120)

      However, following three days of inpatient treatment, the patient becomes anuric. A repeat set of U&Es reveal the following:

      Na+ 145 mmol/L (135 - 145)
      K+ 5.0 mmol/L (3.5 - 5.0)
      Bicarbonate 25 mmol/L (22 - 29)
      Urea 12.0 mmol/L (2.0 - 7.0)
      Creatinine 150 µmol/L (55 - 120)

      What is the likely mechanism of gentamicin causing this patient’s kidney injury?

      Your Answer: Renal artery vasoconstriction

      Correct Answer: Renal cell apoptosis

      Explanation:

      AKI can be attributed to gentamicin due to its ability to induce apoptosis in renal cells. Therefore, patients who are prescribed gentamicin should undergo frequent monitoring of their renal function and drug concentration levels. While there are other potential causes of acute kidney injury, none of them are linked to aminoglycoside antibiotics.

      Understanding the Difference between Acute Tubular Necrosis and Prerenal Uraemia

      Acute kidney injury can be caused by various factors, including prerenal uraemia and acute tubular necrosis. It is important to differentiate between the two to determine the appropriate treatment. Prerenal uraemia occurs when the kidneys hold on to sodium to preserve volume, leading to decreased blood flow to the kidneys. On the other hand, acute tubular necrosis is caused by damage to the kidney tubules, which can be due to various factors such as toxins, infections, or ischemia.

      To differentiate between the two, several factors can be considered. In prerenal uraemia, the urine sodium level is typically less than 20 mmol/L, while in acute tubular necrosis, it is usually greater than 40 mmol/L. The urine osmolality is also higher in prerenal uraemia, typically above 500 mOsm/kg, while in acute tubular necrosis, it is usually below 350 mOsm/kg. The fractional sodium excretion is less than 1% in prerenal uraemia, while it is greater than 1% in acute tubular necrosis. Additionally, the response to fluid challenge is typically good in prerenal uraemia, while it is poor in acute tubular necrosis.

      Other factors that can help differentiate between the two include the serum urea:creatinine ratio, fractional urea excretion, urine:plasma osmolality, urine:plasma urea, specific gravity, and urine sediment. By considering these factors, healthcare professionals can accurately diagnose and treat acute kidney injury.

    • This question is part of the following fields:

      • Renal System
      50.9
      Seconds
  • Question 6 - What is the enzyme necessary for the production of glycogen? ...

    Incorrect

    • What is the enzyme necessary for the production of glycogen?

      Your Answer: Pyruvate carboxylase

      Correct Answer: Glycogen synthase

      Explanation:

      Enzymes Involved in Glycogen Formation

      Glycogen formation is a complex process that requires the involvement of several enzymes. One of the key enzymes involved in this process is glycogen synthase, which is responsible for extending the length of glucose chains within glycogen. This is achieved by creating α1-4 glycosidic linkages between glucose molecules to form a long chain.

      However, the branching on the glycogen chain is created by another enzyme known as the branching enzyme or transferase enzyme. This enzyme produces α1-6 glycosidic linkages, which create branch points on the glycogen chain.

      It is important to note that the debranching enzyme and glycogen phosphorylase are not involved in glycogen production but are instead used in the breakdown of glycogen. Similarly, phosphofructokinase is an enzyme in the glycolysis pathway, while pyruvate carboxylase is required for gluconeogenesis.

      In summary, glycogen formation is a complex process that involves several enzymes, including glycogen synthase and the branching enzyme. These enzymes work together to create the long chains and branch points that make up glycogen.

    • This question is part of the following fields:

      • Clinical Sciences
      20.4
      Seconds
  • Question 7 - A woman undergoes a high anterior resection for carcinoma of the upper rectum....

    Correct

    • A woman undergoes a high anterior resection for carcinoma of the upper rectum. Which one of the following vessels will require ligation?

      Your Answer: Inferior mesenteric artery

      Explanation:

      Anterior resection typically involves dividing the IMA, which is necessary for oncological reasons and also allows for adequate mobilization of the colon for anastomosis.

      The colon begins with the caecum, which is the most dilated segment of the colon and is marked by the convergence of taenia coli. The ascending colon follows, which is retroperitoneal on its posterior aspect. The transverse colon comes after passing the hepatic flexure and becomes wholly intraperitoneal again. The splenic flexure marks the point where the transverse colon makes an oblique inferior turn to the left upper quadrant. The descending colon becomes wholly intraperitoneal at the level of L4 and becomes the sigmoid colon. The sigmoid colon is wholly intraperitoneal, but there are usually attachments laterally between the sigmoid and the lateral pelvic sidewall. At its distal end, the sigmoid becomes the upper rectum, which passes through the peritoneum and becomes extraperitoneal.

      The arterial supply of the colon comes from the superior mesenteric artery and inferior mesenteric artery, which are linked by the marginal artery. The ascending colon is supplied by the ileocolic and right colic arteries, while the transverse colon is supplied by the middle colic artery. The descending and sigmoid colon are supplied by the inferior mesenteric artery. The venous drainage comes from regional veins that accompany arteries to the superior and inferior mesenteric vein. The lymphatic drainage initially follows nodal chains that accompany supplying arteries, then para-aortic nodes.

      The colon has both intraperitoneal and extraperitoneal segments. The right and left colon are part intraperitoneal and part extraperitoneal, while the sigmoid and transverse colon are generally wholly intraperitoneal. The colon has various relations with other organs, such as the right ureter and gonadal vessels for the caecum/right colon, the gallbladder for the hepatic flexure, the spleen and tail of pancreas for the splenic flexure, the left ureter for the distal sigmoid/upper rectum, and the ureters, autonomic nerves, seminal vesicles, prostate, and urethra for the rectum.

    • This question is part of the following fields:

      • Gastrointestinal System
      13.3
      Seconds
  • Question 8 - A 45-year-old woman presents to the clinic with a history of multiple minor...

    Correct

    • A 45-year-old woman presents to the clinic with a history of multiple minor falls and confusion. She has been experiencing daily headaches with nausea for the past 3 years, which have worsened at night and occasionally wake her up. Imaging reveals an intracranial mass located on the left hemisphere's convexity, and a biopsy of the mass shows a whorled pattern of calcified cellular growth that forms syncytial nests and appears as round, eosinophilic laminar structure.

      What is the most probable diagnosis for this patient?

      Your Answer: Meningioma

      Explanation:

      Meningiomas are the second most frequent type of primary brain tumour, often found in the convexities of cerebral hemispheres and parasagittal regions. The biopsy findings of this patient suggest the presence of psammoma bodies, which are mineral deposits formed by calcification of spindle cells in concentric whorls within the tumour.

      Ependymomas usually present as paraventricular tumours and exhibit perivascular rosettes under light microscopy.

      Glioblastomas are the most common primary malignant brain tumour in adults. Light microscopy reveals hypercellular areas of atypical astrocytes surrounding regions of necrosis.

      Medulloblastomas are malignant cerebellar tumours that typically occur in children and are characterized by small blue cells that may encircle neutrophils.

      Brain tumours can be classified into different types based on their location, histology, and clinical features. Metastatic brain cancer is the most common form of brain tumours, which often cannot be treated with surgical intervention. Glioblastoma multiforme is the most common primary tumour in adults and is associated with a poor prognosis. Meningioma is the second most common primary brain tumour in adults, which is typically benign and arises from the arachnoid cap cells of the meninges. Vestibular schwannoma is a benign tumour arising from the eighth cranial nerve, while pilocytic astrocytoma is the most common primary brain tumour in children. Medulloblastoma is an aggressive paediatric brain tumour that arises within the infratentorial compartment, while ependymoma is commonly seen in the 4th ventricle and may cause hydrocephalus. Oligodendroma is a benign, slow-growing tumour common in the frontal lobes, while haemangioblastoma is a vascular tumour of the cerebellum. Pituitary adenoma is a benign tumour of the pituitary gland that can be either secretory or non-secretory, while craniopharyngioma is a solid/cystic tumour of the sellar region that is derived from the remnants of Rathke’s pouch.

    • This question is part of the following fields:

      • Neurological System
      41.5
      Seconds
  • Question 9 - During an inguinal hernia repair, the surgeon identifies a small nerve while mobilizing...

    Incorrect

    • During an inguinal hernia repair, the surgeon identifies a small nerve while mobilizing the cord structures at the level of the superficial inguinal ring. Which nerve is this most likely to be if the patient is in their 60s?

      Your Answer: Pudendal

      Correct Answer: Ilioinguinal

      Explanation:

      Neuropathic pain after inguinal hernia surgery may be caused by the entrapment of the ilioinguinal nerve. This nerve travels through the superficial inguinal ring and is commonly encountered during hernia surgery. The iliohypogastric nerve, on the other hand, passes through the aponeurosis of the external oblique muscle above the superficial inguinal ring.

      The Ilioinguinal Nerve: Anatomy and Function

      The ilioinguinal nerve is a nerve that arises from the first lumbar ventral ramus along with the iliohypogastric nerve. It passes through the psoas major and quadratus lumborum muscles before piercing the internal oblique muscle and passing deep to the aponeurosis of the external oblique muscle. The nerve then enters the inguinal canal and passes through the superficial inguinal ring to reach the skin.

      The ilioinguinal nerve supplies the muscles of the abdominal wall through which it passes. It also provides sensory innervation to the skin and fascia over the pubic symphysis, the superomedial part of the femoral triangle, the surface of the scrotum, and the root and dorsum of the penis or labia majora in females.

      Understanding the anatomy and function of the ilioinguinal nerve is important for medical professionals, as damage to this nerve can result in pain and sensory deficits in the areas it innervates. Additionally, knowledge of the ilioinguinal nerve is relevant in surgical procedures involving the inguinal region.

    • This question is part of the following fields:

      • Neurological System
      24.5
      Seconds
  • Question 10 - Which of the following is true of correlation and regression when analyzing data?...

    Incorrect

    • Which of the following is true of correlation and regression when analyzing data?

      Your Answer: Spearman's correlation coefficient is represented by a small r

      Correct Answer: Regression allows one variable to be predicted from another variable

      Explanation:

      Understanding Correlation and Linear Regression

      Correlation and linear regression are two statistical methods used to analyze the relationship between variables. While they are related, they are not interchangeable. Correlation is used to determine if there is a relationship between two variables, while regression is used to predict the value of one variable based on the value of another variable.

      The degree of correlation is measured by the correlation coefficient, which can range from -1 to +1. A coefficient of 1 indicates a strong positive correlation, while a coefficient of -1 indicates a strong negative correlation. A coefficient of 0 indicates no correlation between the variables. However, correlation coefficients do not provide information on how much the variable will change or the cause and effect relationship between the variables.

      Linear regression, on the other hand, can be used to predict how much one variable will change when another variable is changed. A regression equation can be formed to calculate the value of the dependent variable based on the value of the independent variable. The equation takes the form of y = a + bx, where y is the dependent variable, a is the intercept value, b is the slope of the line or regression coefficient, and x is the independent variable.

      In summary, correlation and linear regression are both useful tools for analyzing the relationship between variables. Correlation determines if there is a relationship, while regression predicts the value of one variable based on the value of another variable. Understanding these concepts can help in making informed decisions and drawing accurate conclusions from data analysis.

    • This question is part of the following fields:

      • General Principles
      19.2
      Seconds
  • Question 11 - A 45-year-old businessman comes to his GP complaining of fever, headache, and diarrhoea....

    Correct

    • A 45-year-old businessman comes to his GP complaining of fever, headache, and diarrhoea. He denies having any coughs, nausea, or vomiting. He has a good health history. However, he recently returned from a business trip to India three weeks ago. He has been consuming the same food and drinks as his family since his return, and they are all healthy. During the examination, the man seems dehydrated and has tenderness in the right upper quadrant.

      What do you think is the probable diagnosis?

      Your Answer: Hepatitis A

      Explanation:

      Understanding Hepatitis A: Symptoms, Transmission, and Prevention

      Hepatitis A is a viral infection that affects the liver. It is usually a mild illness that resolves on its own, with serious complications being rare. The virus is transmitted through the faecal-oral route, often in institutions. The incubation period is typically 2-4 weeks, and symptoms include a flu-like prodrome, abdominal pain (usually in the right upper quadrant), tender hepatomegaly, jaundice, and deranged liver function tests.

      While complications are rare, there is no increased risk of hepatocellular cancer. An effective vaccine is available, and it is recommended for people travelling to or residing in areas of high or intermediate prevalence, those with chronic liver disease, patients with haemophilia, men who have sex with men, injecting drug users, and individuals at occupational risk (such as laboratory workers, staff of large residential institutions, sewage workers, and people who work with primates).

      It is important to note that the vaccine requires a booster dose 6-12 months after the initial dose. By understanding the symptoms, transmission, and prevention of hepatitis A, individuals can take steps to protect themselves and others from this viral infection.

    • This question is part of the following fields:

      • General Principles
      38.5
      Seconds
  • Question 12 - A team of pediatricians from the children's hospital would like to improve antibiotic...

    Correct

    • A team of pediatricians from the children's hospital would like to improve antibiotic prescribing for patients admitted with pneumonia. They have found guidance from the American Academy of Pediatrics which states that all pediatric patients with community-acquired pneumonia should receive the appropriate antibiotic therapy within the first 4 hours of admission.

      The team review how many pediatric patients with pneumonia receive the appropriate antibiotic therapy within the first 4 hours. The results show that only 60% of the pediatric patients with pneumonia receive the appropriate antibiotic therapy within the first 4 hours. The team were concerned that pediatric patients may come to harm through this inefficiency.

      The team develop a new order set on the electronic prescribing system and an alert which notifies the prescriber that the patient has been diagnosed with pneumonia.

      The team plan to repeat the project in 6 months time to assess the efficacy of their intervention.

      What type of project is this?

      Your Answer: Clinical audit

      Explanation:

      The main objective of a clinical audit is to identify areas where clinical practice falls short of the required standard and implement interventions to improve these shortcomings. In this context, the electronic prescribing and electronic prompt are crucial interventions that can be implemented.

      A case-control study is not applicable in this scenario as it involves comparing two groups based on different outcomes and identifying possible causal factors retrospectively. However, in this case, the team is only comparing the results to a defined standard and not looking for cause and effect.

      Similarly, a cohort study is not relevant as it involves comparing two groups with different characteristics over time to observe for differing outcomes. This is not the aim of the clinical audit mentioned above.

      A risk assessment is also not appropriate as it is a systematic process of evaluating the potential risks of undertaking an activity. This is not relevant to the scenario presented, which involves reviewing clinical practice against a defined standard.

      Likewise, a service evaluation is not suitable as it aims to review a clinical service for performance and outcomes, but not against any defined standards. In this scenario, a service evaluation could involve a questionnaire to patients with neutropenic sepsis on their experiences of care in the first hour.

      Understanding Clinical Audit

      Clinical audit is a process that aims to improve the quality of patient care and outcomes by systematically reviewing care against specific criteria and implementing changes. It is a quality improvement process that involves the collection and analysis of data to identify areas where improvements can be made. The process involves reviewing current practices, identifying areas for improvement, and implementing changes to improve patient care and outcomes.

      Clinical audit is an essential tool for healthcare professionals to ensure that they are providing the best possible care to their patients. It helps to identify areas where improvements can be made and provides a framework for implementing changes. The process involves a team of healthcare professionals working together to review current practices and identify areas for improvement. Once areas for improvement have been identified, changes can be implemented to improve patient care and outcomes.

      In summary, clinical audit is a quality improvement process that seeks to improve patient care and outcomes through systematic review of care against explicit criteria and the implementation of change. It is an essential tool for healthcare professionals to ensure that they are providing the best possible care to their patients. By identifying areas for improvement and implementing changes, clinical audit helps to improve patient care and outcomes.

    • This question is part of the following fields:

      • General Principles
      51.6
      Seconds
  • Question 13 - A 29-year-old pregnant woman is admitted to the hospital and delivers a baby...

    Incorrect

    • A 29-year-old pregnant woman is admitted to the hospital and delivers a baby girl at 32 weeks gestation. The newborn displays signs of distress including tachypnoea, tachycardia, expiratory grunting, nasal flaring, and chest wall recession.

      What is the cell type responsible for producing the substance that the baby is lacking?

      Your Answer: Type 1 pneumocytes

      Correct Answer: Type 2 pneumocytes

      Explanation:

      Types of Pneumocytes and Their Functions

      Pneumocytes are specialized cells found in the lungs that play a crucial role in gas exchange. There are two main types of pneumocytes: type 1 and type 2. Type 1 pneumocytes are very thin squamous cells that cover around 97% of the alveolar surface. On the other hand, type 2 pneumocytes are cuboidal cells that secrete surfactant, a substance that reduces surface tension in the alveoli and prevents their collapse during expiration.

      Type 2 pneumocytes start to develop around 24 weeks gestation, but adequate surfactant production does not take place until around 35 weeks. This is why premature babies are prone to respiratory distress syndrome. In addition, type 2 pneumocytes can differentiate into type 1 pneumocytes during lung damage, helping to repair and regenerate damaged lung tissue.

      Apart from pneumocytes, there are also club cells (previously termed Clara cells) found in the bronchioles. These non-ciliated dome-shaped cells have a varied role, including protecting against the harmful effects of inhaled toxins and secreting glycosaminoglycans and lysozymes. Understanding the different types of pneumocytes and their functions is essential in comprehending the complex mechanisms involved in respiration.

    • This question is part of the following fields:

      • Respiratory System
      16.2
      Seconds
  • Question 14 - A 55-year-old man is hospitalized after experiencing haematemesis. Upon examination, his prothrombin time...

    Incorrect

    • A 55-year-old man is hospitalized after experiencing haematemesis. Upon examination, his prothrombin time is found to be elevated. What could be a possible reason for this anomaly?

      Your Answer: Aspirin therapy

      Correct Answer: Chronic liver disease

      Explanation:

      The inheritance of Haemophilia A and B is crucial in identifying individuals who are at risk of developing the condition. Haemophilia A and B are genetic disorders that are inherited in an X-linked recessive manner. Haemophilia A is caused by a deficiency in clotting factor VIII, while haemophilia B is caused by a deficiency in clotting factor IX.

      On the other hand, haemophilia C, which is caused by a deficiency in clotting factor XI, is primarily inherited in an autosomal recessive manner. In X-linked recessive conditions like haemophilia B, males are more likely to be affected than females. This is because males only need one abnormal copy of the gene, which is carried on the X chromosome, to be affected.

      Females, on the other hand, can be carriers of the condition if they carry one normal and one abnormal copy of the gene. While carriers can have clotting abnormalities, these are usually milder than those seen in affected individuals. Men cannot pass the condition to their sons, but they will pass on the abnormal X chromosome to all their daughters, who will be carriers.

      Female carriers can pass on the condition to around half their sons, and half their daughters will be carriers. Females can only be affected if they are the offspring of an affected male and a carrier female. In summary, the inheritance of haemophilia A and B is crucial in identifying individuals who are at risk of developing the condition. It also helps in providing appropriate genetic counseling and management for affected individuals and their families.

    • This question is part of the following fields:

      • Haematology And Oncology
      37.2
      Seconds
  • Question 15 - A 32-year-old pregnant woman attends her 20-week anomaly scan. She has had two...

    Correct

    • A 32-year-old pregnant woman attends her 20-week anomaly scan. She has had two previous pregnancies resulting in two sons. The pregnancy has been uneventful so far. During the scan, the sonographer observes that the foetus is below the 10th percentile for size, indicating that it is small for gestational age.

      What potential risk factors could have played a role in this outcome?

      Your Answer: Smoking

      Explanation:

      Smoking while pregnant is associated with a higher likelihood of having a baby that is small for gestational age. The increased risk is thought to be due to exposure to nicotine and carbon monoxide. Diabetes mellitus, previous pregnancy, and maternal obesity are not linked to small for gestational age babies, but rather to large for gestational age babies.

      Small for Gestational Age (SGA) is a statistical definition used to describe babies who are smaller than expected for their gestational age. Although there is no universally agreed percentile, the 10th percentile is often used, meaning that 10% of normal babies will be below this threshold. SGA can be determined either antenatally or postnatally. There are two types of SGA: symmetrical and asymmetrical. Symmetrical SGA occurs when the fetal head circumference and abdominal circumference are equally small, while asymmetrical SGA occurs when the abdominal circumference slows relative to the increase in head circumference.

      There are various causes of SGA, including incorrect dating, constitutionally small (normal) babies, and abnormal fetuses. Symmetrical SGA is more common and can be caused by idiopathic factors, race, sex, placental insufficiency, pre-eclampsia, chromosomal and congenital abnormalities, toxins such as smoking and heroin, and infections such as CMV, parvovirus, rubella, syphilis, and toxoplasmosis. Asymmetrical SGA is less common and can be caused by toxins such as alcohol, cigarettes, and heroin, chromosomal and congenital abnormalities, and infections.

      The management of SGA depends on the type and cause. For symmetrical SGA, most cases represent the lower limits of the normal range and require fortnightly ultrasound growth assessments to demonstrate normal growth rates. Pathological causes should be ruled out by checking maternal blood for infections and searching the fetus carefully with ultrasound for markers of chromosomal abnormality. Asymmetrical SGA also requires fortnightly ultrasound growth assessments, as well as biophysical profiles and Doppler waveforms from umbilical circulation to look for absent end-diastolic flow. If results are sub-optimal, delivery may be considered.

    • This question is part of the following fields:

      • Reproductive System
      16.8
      Seconds
  • Question 16 - Mrs. Johnson is an 82-year-old woman who visited her General practitioner complaining of...

    Incorrect

    • Mrs. Johnson is an 82-year-old woman who visited her General practitioner complaining of gradual worsening shortness of breath over the past two months. During the medical history, it was discovered that she has had Chronic Obstructive Pulmonary Disease (COPD) for 20 years.

      Upon examination, there are no breath sounds at both lung bases and a stony dull note to percussion over the same areas. Based on this clinical scenario, what is the probable cause of her recent exacerbation of shortness of breath?

      Your Answer: Pleural exudate effusion secondary to cor pulmonale

      Correct Answer: Pleural transudate effusion secondary to cor pulmonale

      Explanation:

      The most likely cause of a pleural transudate is heart failure. This is due to the congestion of blood into the systemic venous circulation, which can result from long-standing COPD and increase in pulmonary vascular resistance leading to right-sided heart failure or cor pulmonale. Other options such as infective exacerbation of COPD or pulmonary edema secondary to heart failure are less likely to explain the clinical signs. Pleural exudate effusion secondary to cor pulmonale is also not the most appropriate answer as it would cause a transudate pleural effusion, not an exudate.

      Understanding the Causes and Features of Pleural Effusion

      Pleural effusion is a medical condition characterized by the accumulation of fluid in the pleural space, which is the area between the lungs and the chest wall. The causes of pleural effusion can be classified into two types: transudate and exudate. Transudate is characterized by a protein concentration of less than 30g/L and is commonly caused by heart failure, hypoalbuminemia, liver disease, and other conditions. On the other hand, exudate is characterized by a protein concentration of more than 30g/L and is commonly caused by infections, pneumonia, tuberculosis, and other conditions.

      The symptoms of pleural effusion may include dyspnea, non-productive cough, and chest pain. Upon examination, patients may exhibit dullness to percussion, reduced breath sounds, and reduced chest expansion. It is important to identify the underlying cause of pleural effusion to determine the appropriate treatment plan. Early diagnosis and treatment can help prevent complications and improve the patient’s overall health.

    • This question is part of the following fields:

      • Respiratory System
      37.2
      Seconds
  • Question 17 - A 35-year-old woman delivers a baby at term through spontaneous delivery. The newborn...

    Incorrect

    • A 35-year-old woman delivers a baby at term through spontaneous delivery. The newborn weighs 1500 g and appears to be struggling. Upon blood tests, hyperglycemia is detected and the baby is diagnosed with neonatal diabetes after a senior consultant evaluation. The consultant informs the mother that neonatal diabetes may result from the absence of an enzyme called glucokinase, which is essential for what function in carbohydrate metabolism?

      Your Answer: Converts phosphoenol pyruvate to pyruvate

      Correct Answer: Phosphorylates glucose to glucose-6-phosphate

      Explanation:

      Glucose is phosphorylated to glucose-6-phosphate by the enzyme glucokinase. The resulting glucose-6-phosphate is then converted to fructose-6-phosphate by glucose-6-phosphate isomerase. Phosphofructokinase-1 then phosphorylates fructose-6-phosphate to form fructose-1,6-bisphosphate. Finally, pyruvate kinase converts phosphoenol pyruvate to pyruvate.

      Glucokinase: An Enzyme Involved in Carbohydrate Metabolism

      Glucokinase is an enzyme that can be found in various parts of the body such as the liver, pancreas, small intestine, and brain. Its primary function is to convert glucose into glucose-6-phosphate through a process called phosphorylation. This enzyme plays a crucial role in carbohydrate metabolism, which is the process of breaking down carbohydrates into energy that the body can use. Without glucokinase, the body would not be able to properly regulate its blood sugar levels, which can lead to various health problems such as diabetes. Overall, glucokinase is an essential enzyme that helps the body maintain its energy balance and overall health.

    • This question is part of the following fields:

      • General Principles
      79.9
      Seconds
  • Question 18 - Which one of the following statements relating to the Cavernous Sinus is not...

    Incorrect

    • Which one of the following statements relating to the Cavernous Sinus is not true?

      Your Answer: The internal carotid artery passes through it

      Correct Answer: The mandibular branch of the trigeminal and optic nerve lie on the lateral wall

      Explanation:

      The veins that empty into the sinus play a crucial role in preventing cavernous sinus thrombosis, which can result from sepsis. It is worth noting that the maxillary branch of the trigeminal nerve, rather than the mandibular branches, traverses the sinus.

      Understanding the Cavernous Sinus

      The cavernous sinuses are a pair of structures located on the sphenoid bone, running from the superior orbital fissure to the petrous temporal bone. They are situated between the pituitary fossa and the sphenoid sinus on the medial side, and the temporal lobe on the lateral side. The cavernous sinuses contain several important structures, including the oculomotor, trochlear, ophthalmic, and maxillary nerves, as well as the internal carotid artery and sympathetic plexus, and the abducens nerve.

      The lateral wall components of the cavernous sinuses include the oculomotor, trochlear, ophthalmic, and maxillary nerves, while the contents of the sinus run from medial to lateral and include the internal carotid artery and sympathetic plexus, and the abducens nerve. The blood supply to the cavernous sinuses comes from the ophthalmic vein, superficial cortical veins, and basilar plexus of veins posteriorly. The cavernous sinuses drain into the internal jugular vein via the superior and inferior petrosal sinuses.

      In summary, the cavernous sinuses are important structures located on the sphenoid bone that contain several vital nerves and blood vessels. Understanding their location and contents is crucial for medical professionals in diagnosing and treating various conditions that may affect these structures.

    • This question is part of the following fields:

      • Neurological System
      21.2
      Seconds
  • Question 19 - A 56-year-old male with a history of hypertension presents with symptoms of a...

    Correct

    • A 56-year-old male with a history of hypertension presents with symptoms of a stroke. Upon examination, he exhibits weakness on the right side of his face and arm, as well as expressive dysphasia. The diagnosis is confirmed, and thrombolysis is scheduled. Which artery is the most probable site of occlusion?

      Your Answer: Left middle cerebral

      Explanation:

      The patient is experiencing weakness and loss of sensation on the opposite side of their body, with the upper limb being more affected than the lower limb. They also have vision loss on the opposite side and difficulty with speech. These symptoms suggest that the middle cerebral artery on the left side of the brain is affected. It is important to have a good understanding of the circle of Willis and its cerebral associations to visualize the affected area. The left middle cerebral artery supplies the left temporal and parietal lobes of the brain, including the area responsible for speech, which explains the patient’s aphasia.

      Stroke can affect different parts of the brain depending on which artery is affected. If the anterior cerebral artery is affected, the person may experience weakness and loss of sensation on the opposite side of the body, with the lower extremities being more affected than the upper. If the middle cerebral artery is affected, the person may experience weakness and loss of sensation on the opposite side of the body, with the upper extremities being more affected than the lower. They may also experience vision loss and difficulty with language. If the posterior cerebral artery is affected, the person may experience vision loss and difficulty recognizing objects.

      Lacunar strokes are a type of stroke that are strongly associated with hypertension. They typically present with isolated weakness or loss of sensation on one side of the body, or weakness with difficulty coordinating movements. They often occur in the basal ganglia, thalamus, or internal capsule.

    • This question is part of the following fields:

      • Neurological System
      14.2
      Seconds
  • Question 20 - A 50-year-old man with multiple sclerosis is prescribed baclofen by your consultant to...

    Correct

    • A 50-year-old man with multiple sclerosis is prescribed baclofen by your consultant to treat muscle spasms.

      What is the mechanism of action of baclofen?

      Your Answer: GABA receptor agonist

      Explanation:

      Baclofen is a medication that is commonly prescribed to alleviate muscle spasticity in individuals with conditions like multiple sclerosis, cerebral palsy, and spinal cord injuries. It works by acting as an agonist of GABA receptors in the central nervous system, which includes both the brain and spinal cord. Essentially, this means that baclofen helps to enhance the effects of a neurotransmitter called GABA, which can help to reduce the activity of certain neurons and ultimately lead to a reduction in muscle spasticity. Overall, baclofen is an important medication for individuals with these conditions, as it can help to improve their quality of life and reduce the impact of muscle spasticity on their daily activities.

    • This question is part of the following fields:

      • Neurological System
      12.3
      Seconds

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Gastrointestinal System (1/2) 50%
Haematology And Oncology (1/2) 50%
Clinical Sciences (1/2) 50%
Neurological System (4/6) 67%
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General Principles (2/4) 50%
Respiratory System (0/2) 0%
Reproductive System (1/1) 100%
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