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Question 1
Correct
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Which of the following is NOT a typical clinical feature of beta-thalassaemia major:
Your Answer: Increased bleeding tendency
Explanation:Features include:- severe anaemia (becoming apparent at 3 – 6 months when the switch from gamma-chain to beta-chain production takes place)- failure to thrive- hepatosplenomegaly (due to excessive red cell destruction, extramedullary haemopoiesis and later due to transfusion related iron overload)- expansion of bones (due to marrow hyperplasia, resulting in bossing of the skull and cortical thinning with tendency to fracture)- increased susceptibility to infections (due to anaemia, iron overload, transfusion and splenectomy)- osteoporosis- hyperbilirubinaemia and gallstones- hyperuricaemia and gout- other features of haemolytic anaemia- liver damage and other features of iron overload
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This question is part of the following fields:
- Haematology
- Pathology
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Question 2
Incorrect
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Innate, or non-specific, immunity is the immune system we are born with.Which of the following is NOT an example of innate immunity? Select ONE answer only.
Your Answer: Enzymes in tears
Correct Answer: T-lymphocytes
Explanation:Innate, or non-specific, immunity is the immune system we are born with.There are three aspects of innate immunity:1. Anatomical barriers, such as:The cough reflexEnzymes in tears and skin oilsMucus – which traps bacteria and small particlesSkinStomach acid2. Humoral barriers, such as:The complement systemInterleukin-13. Cellular barriers, such as:NeutrophilsMacrophagesDendritic cellsNatural killer cellsAntibody production is part of the specific, or inducible immune response. T-lymphocytesare responsible for the cell mediated immune response which is part of specific, or inducible immunity.
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This question is part of the following fields:
- General Pathology
- Pathology
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Question 3
Incorrect
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You see a patient in the Emergency Department with features consistent with a diagnosis of type I diabetes mellitus.Which of these is MOST suggestive of type I diabetes mellitus?
Your Answer: Onset under the age of 20
Correct Answer: History of recent weight loss
Explanation:A history of recent weight loss is very suggestive of an absolute deficiency of insulin seen in type I diabetes mellitus.An age of onset of less than 20 years makes a diagnosis of type I diabetes mellitus more likely. However, an increasing number of obese children and young people are being diagnosed with type II diabetes.Microalbuminuria, peripheral neuropathy, and retinopathy all occur in both type I and type II diabetes mellitus. They are not more suggestive of type I DM.
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This question is part of the following fields:
- Endocrine Physiology
- Physiology
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Question 4
Correct
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After what time period should intravenous phenytoin be used as second-line treatment of status epilepticus?
Your Answer: 25 minutes
Explanation:If seizures recur or fail to respond after initial treatment with benzodiazepines within 25 minutes of onset, phenytoin sodium, fosphenytoin sodium, or phenobarbital sodium should be used.
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This question is part of the following fields:
- Central Nervous System
- Pharmacology
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Question 5
Incorrect
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A 7-year old boy is referred to the Paediatrics Department due to slurred speech. Upon further examination, the attending physician noted the presence of dysdiadochokinesia, intention tremors, and nystagmus. An MRI is taken, which revealed a brain tumour.Which of the following options is the most probable diagnosis given the clinical features of the patient?
Your Answer:
Correct Answer: Astrocytoma of cerebellum
Explanation:Pilocytic astrocytoma (PCA), previously known as cystic cerebellar astrocytoma or juvenile pilocytic astrocytoma, was first described in 1931 by Harvey Cushing, based on a case series of cerebellar astrocytomas; though he never used these terms but rather described a spongioblastoma. They are low-grade, and usually well-circumscribed tumours, which tend to occur in young patients. By the World Health Organization (WHO) classification of central nervous system tumours, they are considered grade I gliomas and have a good prognosis.PCA most commonly occurs in the cerebellum but can also occur in the optic pathway, hypothalamus, and brainstem. They can also occur in the cerebral hemispheres, although this tends to be the case in young adults. Presentation and treatment vary for PCA in other locations. Glial cells include astrocytes, oligodendrocytes, ependymal cells, and microglia. Astrocytic tumours arise from astrocytes and are the most common tumour of glial origin. The WHO 2016 categorized these tumours as either diffuse gliomas or other astrocytic tumours. Diffuse gliomas include grade II and III diffuse astrocytomas, grade IV glioblastoma, and diffuse gliomas of childhood. The other astrocytic tumours group include PCA, pleomorphic xanthoastrocytoma, subependymal giant cell astrocytoma, and anaplastic pleomorphic xanthoastrocytoma.PCA can present with symptoms secondary to the posterior fossa mass effect. This may include obstructive hydrocephalus, with resultant headache, nausea and vomiting, and papilledema. If hydrocephalus occurs before the fusion of the cranial sutures (<18-months-of-age), then an increase in head circumference will likely occur. Lesions of the cerebellar hemisphere result in peripheral ataxia, dysmetria, intention tremor, nystagmus, and dysarthria. In contrast, lesions of the vermis cause a broad-based gait, truncal ataxia, and titubation. Posterior fossa lesions can also cause cranial nerve palsies. Diplopia may occur due to abducens palsy from the stretching of the nerve. They may also have blurred vision due to papilledema. Seizures are rare with posterior fossa lesions.
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This question is part of the following fields:
- Anatomy
- Central Nervous System
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Question 6
Incorrect
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A patient who is taking ramipril for high blood pressure complains of a dry persistent cough. What is the mechanism of cough in ACE inhibitor therapy:
Your Answer:
Correct Answer: Decreased bradykinin breakdown
Explanation:Blocking ACE also diminishes the breakdown of the potent vasodilator bradykinin which is the cause of the persistent dry cough. Angiotensin-II receptor blockers do not have this effect, therefore they are useful alternative for patients who have to discontinue an ACE inhibitor because of persistent cough.
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This question is part of the following fields:
- Cardiovascular
- Pharmacology
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Question 7
Incorrect
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What is nimodipine used predominantly in the treatment of?
Your Answer:
Correct Answer: Prevention and treatment of vascular spasm following subarachnoid haemorrhage
Explanation:Nimodipine is a smooth muscle relaxant that is related to nifedipine, but the effects preferentially act on cerebral arteries. It is exclusively used for the prevention and treatment of vascular spasm after an aneurysmal subarachnoid haemorrhage.
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This question is part of the following fields:
- Cardiovascular
- Pharmacology
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Question 8
Incorrect
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Which of the following statements is INCORRECT. Fick's law tells us that the rate of diffusion of a gas across a membrane increases as:
Your Answer:
Correct Answer: the partial pressure gradient decreases.
Explanation:Fick’s law tells us that the rate of diffusion of a gas increases: the larger the surface area involved in gas exchangethe greater the partial pressure gradient across the membranethe thinner the membranethe more soluble the gas in the membranethe lower the molecular weight of the gas
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This question is part of the following fields:
- Physiology
- Respiratory
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Question 9
Incorrect
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Renal potassium excretion is promoted by all but which one of the following:
Your Answer:
Correct Answer: Increased intracellular magnesium
Explanation:Aldosterone: A rise in [K+] in the extracellular fluid of the adrenal cortex directly stimulates aldosterone release. Aldosterone promotes the synthesis of Na+/K+ATPases and the insertion of more Na+/K+ATPases into the basolateral membrane, and also stimulates apical sodium and potassium channel activity, overall acting to increase sodium reabsorption and potassium secretion.pH changes: Potassium secretion is reduced in acute acidosis and increased in acute alkalosis. A higher pH increases the apical K+channel activity and the basolateral Na+/K+ATPase activity – both changes that promote K+secretion.Flow rates: Increased flow rates in the collecting duct reduce K+concentration in the lumen and therefore enhance K+secretion. Increased flow also activates BK potassium channels, and ENaC channels which promote potassium secretion and sodium reabsorption respectively.Sodium delivery: Decreased Na+delivery to the collecting ducts results in less Na+reabsorption and hence a reduced gradient for K+secretion.Magnesium: Intracellular magnesium can bind and block K+channels inhibiting K+secretion into the tubules. Therefore magnesium deficiency reduces this inhibitory effect and so allows more potassium to be secreted into tubules and can cause hypokalaemia.
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This question is part of the following fields:
- Physiology
- Renal
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Question 10
Incorrect
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Which of the following is NOT a typical side effect of digoxin:
Your Answer:
Correct Answer: Hypokalaemia
Explanation:Digoxin does not cause hypokalaemia, but hypokalaemia does potentiate digoxin toxicity. The adverse effects of digoxin are frequently due to its narrow therapeutic window and include: Cardiac adverse effects – Sinoatrial and atrioventricular block, Premature ventricular contractions, PR prolongation and ST-segment depressionNausea, vomiting and diarrhoeaBlurred or yellow visionCNS effects – weakness, dizziness, confusion, apathy, malaise, headache, depression, psychosisThrombocytopenia and agranulocytosis (rare)Gynaecomastia in men in prolonged administration
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This question is part of the following fields:
- Cardiovascular
- Pharmacology
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Question 11
Incorrect
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A patient suffers a lower limb fracture that causes damage to the nerve that innervates peroneus brevis.Peroneus brevis receives its innervation from which of the following nerves? Select ONE answer only.
Your Answer:
Correct Answer: Superficial peroneal nerve
Explanation:Peroneus brevis is innervated by the superficial peroneal nerve.Peroneus longus is innervated by the superficial peroneal nerve.Peroneus tertius is innervated by the deep peroneal nerve.
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This question is part of the following fields:
- Anatomy
- Lower Limb
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Question 12
Incorrect
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A 65-year-old man complains of severe vertigo, nausea, and tinnitus. Upon presenting himself to the emergency room, it was observed that he is exhibiting ataxia, right-sided loss of pain and temperature sense on the face, and left-sided sensory loss to the body. An MRI and CT scan was ordered and the results showed that he is suffering from a right-sided stroke. Branches of which of the following arteries are most likely implicated in the case?
Your Answer:
Correct Answer: Basilar artery
Explanation:The lateral pontine syndrome occurs due to occlusion of perforating branches of the basilar and anterior inferior cerebellar (AICA) arteries. It is also known as Marie-Foix syndrome or Marie-Foix-Alajouanine syndrome. It is considered one of the brainstem stroke syndromes of the lateral aspect of the pons.It is characterized by ipsilateral limb ataxia, loss of pain and temperature sensation of the face, facial weakness, hearing loss, vertigo and nystagmus, hemiplegia/hemiparesis, and loss of pain and temperature sensation.
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This question is part of the following fields:
- Anatomy
- Central Nervous System
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Question 13
Incorrect
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Digoxin exhibits its positive inotropic effect by which of the following mechanisms:
Your Answer:
Correct Answer: Inhibits the Na+/K+ pump on the myocyte membrane
Explanation:Cardiac glycosides (e.g. digoxin) slow the removal of Ca2+from the cell by inhibiting the membrane Na+pump (Na+/K+ATPase) which generates the Na+gradient required for driving the export of Ca2+by Na+/Ca2+exchange; consequently the removal of Ca2+from the myocyte is slowed and more Ca2+is available for the next contraction.
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This question is part of the following fields:
- Cardiovascular
- Physiology
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Question 14
Incorrect
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A 66-year-old female who is a known case of atrial fibrillation comes to the Emergency Department with the complaint of fever and vomiting for the past two days. When her medical chart is reviewed, you see that she takes Warfarin for her arrhythmia. Which ONE of the following medications cannot be prescribed to this patient?
Your Answer:
Correct Answer: Ibuprofen
Explanation:Like other non-steroidal anti-inflammatory drugs, Ibuprofen cannot be given with Warfarin as it would increase the bleeding risk of this patient.
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This question is part of the following fields:
- Cardiovascular Pharmacology
- Pharmacology
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Question 15
Incorrect
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All of the following statements are incorrect about insulin except:
Your Answer:
Correct Answer: Proinsulin is cleaved into insulin and C peptide.
Explanation:Proinsulin is synthesised as a single-chain peptide. A connecting peptide (C peptide) within storage granules is removed by proteases to yield insulin. Insulin:1. is a polypeptide hormone consisting of two short chains (A and B) linked by disulphide bonds. 2. is produced by beta cells, located centrally within the islets of Langerhans, in the endocrine tissues of the pancreas. 3. release is stimulated initially during eating by the parasympathetic nervous system and gut hormones such as secretin. However, most output is driven by the rise in plasma glucose concentration that occurs after a meal. 4. effects are mediated by the receptor tyrosine kinase.
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This question is part of the following fields:
- Endocrine
- Physiology
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Question 16
Incorrect
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A 65-year-old man presents with a red, hot, swollen great toe. A diagnosis of acute gout is made. His past medical history includes heart failure and type 2 diabetes mellitus.Which of the following is the most appropriate medication to use in the treatment of his gout? Select ONE answer only.
Your Answer:
Correct Answer: Colchicine
Explanation:In the absence of any contra-indications, high-dose NSAIDs are the first-line treatment for acute gout. Naproxen 750 mg as a stat dose followed by 250 mg TDS is a commonly used and effective regime.Aspirin should not be used in gout as it reduces the urinary clearance of urate and interferes with the action of uricosuric agents. Naproxen, Diclofenac or Indomethacin are more appropriate choices.Allopurinol is used prophylactically, preventing future attacks by reducing serum uric acid levels. It should not be started in the acute phase as it increases the severity and duration of symptoms.Colchicine acts on the neutrophils, binding to tubulin to prevent neutrophil migration into the joint. It is as effective as NSAIDs in relieving acute attacks. It also has a role in prophylactic treatment if Allopurinol is not tolerated.NSAIDs are contra-indicated in heart failure as they can cause fluid retention and congestive cardiac failure. Colchicine is the preferred treatment in patients with heart failure or those who are intolerant of NSAIDs.
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This question is part of the following fields:
- Musculoskeletal Pharmacology
- Pharmacology
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Question 17
Incorrect
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Regarding basophils, which of the following statements is INCORRECT:
Your Answer:
Correct Answer: They are the second most common type of granulocyte.
Explanation:Basophils are only occasionally seen in normal peripheral blood comprising < 1% of circulating white cells. However, they are the largest type of granulocyte. They have many dark cytoplasmic granules which overlie the nucleus and contain heparin and histamine. They have immunoglobulin E (IgE) attachment sites and their degranulation is associated with histamine release. Basophils are very similar in both appearance and function to mast cells.
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This question is part of the following fields:
- Immune Responses
- Pathology
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Question 18
Incorrect
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Platelet alpha granules release which of the following?
Your Answer:
Correct Answer: Von Willebrand factor (VWF)
Explanation:There are three types of storage granules contained in platelets. These are dense granules which contain the following:-ATP -ADP -serotonin and calcium alpha granules containing clotting factors-von Willebrand factor (VWF)-platelet-derived growth factor (PDGF)- other proteins lysosomes containing hydrolytic enzymes.
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This question is part of the following fields:
- Basic Cellular
- Physiology
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Question 19
Incorrect
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An 18-year-old student presents with a 1-week history of sore throat, low grade fever, and malaise. Upon history taking, she noted that she had a fine rash over her body a week ago that quickly fades. Further examination and observation was done and the presence of mild splenomegaly was noted. Her test shows positive for heterophile antibody test, suspecting a diagnosis of infectious mononucleosis.Which of the following characteristics is mostly associated with the diagnosis of infectious mononucleosis?
Your Answer:
Correct Answer: Atypical lymphocytes
Explanation:Epstein-Barr virus causes infectious mononucleosis which is a clinical entity characterized by sore throat, cervical lymph node enlargement, fatigue and fever. It is accompanied by atypical large peripheral blood lymphocytes. These atypical lymphocytes, also known as Downey cells, are actually activated CD8 T lymphocytes, most of which are responding to EBV-infected cells.
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This question is part of the following fields:
- Microbiology
- Specific Pathogen Groups
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Question 20
Incorrect
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A patient with a recent diagnosis of Hepatitis B would like to find out further information regarding his diagnosis and prognosis. Which among the following statements is considered true regarding Hepatitis B?
Your Answer:
Correct Answer: 60-65% of patients that contract hepatitis B show subclinical disease
Explanation:As the immune response is activated, the virus is slowly cleared from the system, and most patients become non-infectious. In adults, about 50% of infections are asymptomatic; 20% to 30% of patients exhibit clinical jaundice but have a benign resolution of the infection. Therefore, about 80% of infections do not cause serious sequelae. The risk for chronic infection is inversely proportional to age at time of infection, with approximately 90% of infants and only 3% of adults developing a chronic infection. Individuals with a chronic infection have a higher risk of liver disease, such as cirrhosis or hepatic carcinoma.
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This question is part of the following fields:
- Microbiology
- Specific Pathogen Groups
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Question 21
Incorrect
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A 30-year-old woman presents with a history of fever and sore throat. On examination, there is tonsillar exudate and cervical lymphadenopathy and a diagnosis of tonsillitis is made. A course of penicillin is prescribed.What is the mechanism of action of penicillin?
Your Answer:
Correct Answer: Inhibition of cell wall synthesis
Explanation:Penicillin is bactericidal and produces its antimicrobial action by preventing cross-linkage between the linear peptidoglycan polymer chains that make up the bacterial cell wall. This action inhibits cell wall synthesis.
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This question is part of the following fields:
- Infections
- Pharmacology
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Question 22
Incorrect
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Which of the following bacteria is a rod-shaped, oxidase-positive, opportunistic gram-negative bacteria that can cause a catheter-related urinary tract infection (UTI)?
Your Answer:
Correct Answer: Pseudomonas aeruginosa
Explanation:Listeria monocytogenes is a gram-positive bacteria that does not produce spores. Staphylococcus aureus is a gram-positive bacteria, while Candida albicans is a gram-positive yeast with a single bud. Among the choices, gram-negative bacteria include only Klebsiella pneumoniae and Pseudomonas aeruginosa. Pseudomonas aeruginosa is an oxidase-positive bacterium, while Klebsiella pneumoniae is an oxidase-negative bacterium. P. aeruginosa can cause urinary tract infections (UTIs) and is spread through poor hygiene or contaminated medical equipment or devices, such as catheters that haven’t been fully sterilized.
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This question is part of the following fields:
- Infections
- Microbiology
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Question 23
Incorrect
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You've been summoned to the resuscitation area to assist a patient who is having a seizure. As part of the treatment protocol, a benzodiazepine dose is given.Which of the following statements about the use of benzodiazepines in seizures is correct?
Your Answer:
Correct Answer: Lorazepam can be given by the rectal route
Explanation:A single dose of IV benzodiazepine will terminate the seizure in 60 to 80 percent of patients who present with seizures.Because benzodiazepines are lipid-soluble, they cross the blood-brain barrier quickly. This explains their quick onset of action.As a first-line treatment, IV lorazepam should be given. If IV lorazepam is not available, IV diazepam can be used instead, and buccal midazolam can be used if intravenous access cannot be established quickly. Lorazepam can be administered via the rectal route, but it is less reliable and has a lower absorption rate and bioavailability.
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This question is part of the following fields:
- CNS Pharmacology
- Pharmacology
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Question 24
Incorrect
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Intracellular [Ca2+] rise in cardiac excitation-contraction coupling is mainly as a result of:
Your Answer:
Correct Answer: Ca 2+ release from sarcoplasmic reticulum
Explanation:Although Ca2+entry during the action potential (AP) is essential for contraction, it only accounts for about 25% of the rise in intracellular Ca2+. The rest is released from Ca2+stores in the sarcoplasmic reticulum (SR). APs travel down invaginations of the sarcolemma called T-tubules, which are close to, but do not touch, the terminal cisternae of the SR. During the AP plateau, Ca2+enters the cell and activates Ca2+sensitive Ca2+release channels in the sarcoplasmic reticulum allowing stored Ca2+to flood into the cytosol; this is called Ca2+-induced Ca2+release. The amount of Ca2+released is dependent on how much is stored, and on the size of the initial Ca2+influx during the AP.
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This question is part of the following fields:
- Cardiovascular
- Physiology
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Question 25
Incorrect
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A 66-year-old male presents to his family physician with the complaint of increasing fatigue and lethargy, along with itching, especially after a hot bath. He also complains of increased sweating and dizziness. On examination, he has a plethoric appearance. Abdominal examination shows the presence of splenomegaly. A basic panel of blood tests is ordered in which her Hb comes out to be 17 g/dL. Which one of the following treatment options will be most suitable in this case?
Your Answer:
Correct Answer: Venesection
Explanation:The clinical and laboratory findings, in this case, support a diagnosis of polycythaemia vera. A plethoric appearance, lethargy, splenomegaly and itching are common in this disease. Patients may also have gouty arthritis, Budd-Chiari syndrome, erythromelalgia, stroke, myocardial infarction or DVT. The average age for diagnosis of Polycythaemia Vera is 65-74 years. It is a haematological malignancy in which there is overproduction of all three cell lines. Venesection is the treatment of choice as it would cause a decrease in the number of red blood cells within the body.Erythropoietin is given in patients with chronic renal failure as they lack this hormone. Administration of erythropoietin in such patients causes stimulation of the bone marrow to produce red blood cells. Desferrioxamine is a chelating agent for iron and is given to patients with iron overload due to repeated blood transfusions, e.g. in thalassemia patients.Penicillamine is a chelating agent for Copper, given as treatment in Wilson’s disease.
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This question is part of the following fields:
- Haematology
- Pathology
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Question 26
Incorrect
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Insulin is a very important peptide hormone produced by the islets of Langerhans in the pancreas.Insulin is synthesised by which of the following cell types within the islets of Langerhans? Select ONE answer only.
Your Answer:
Correct Answer: Beta cells
Explanation:Insulin is produced by beta cells, located centrally within the islets of Langerhans, in the endocrine tissues of the pancreas. Insulin is a polypeptide hormone consisting of two short chains (A and B) linked by disulphide bonds. Proinsulin is synthesised as a single-chain peptide. Within storage granules, a connecting peptide (C peptide) is removed by proteases to yield insulin. Insulin release is stimulated initially during eating by the parasympathetic nervous system and gut hormones such as secretin, but most output is driven by the rise in plasma glucose concentration that occurs after a meal. The effects of insulin are mediated by the receptor tyrosine kinase.
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This question is part of the following fields:
- Endocrine Physiology
- Physiology
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Question 27
Incorrect
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Question 28
Incorrect
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A 5 day old, full term neonate is with a unilateral purulent eye discharge noticed earlier that day is brought in. On gram stain of the exudate, no bacteria are seen. What is the most likely causative pathogen?
Your Answer:
Correct Answer: Chlamydia trachomatis
Explanation:Conjunctivitis occurring in the first 28 days of life (Ophthalmia neonatorum) is most commonly caused by Chlamydia trachomatis in the UK.
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This question is part of the following fields:
- Microbiology
- Pathogens
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Question 29
Incorrect
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You investigated a patient with a chest infection and want to start antibiotics right away. The patient says they she can't take cephalosporins when you ask about allergies.Choose the 'second-generation' cephalosporin from the following choices?
Your Answer:
Correct Answer: Cefuroxime
Explanation:Cephalosporins of the first generation include cephalexin, cefradine, and cefadroxil. Urinary tract infections, respiratory tract infections, otitis media, and skin and soft-tissue infections are all treated with them.Second-generation cephalosporins include cefuroxime, cefaclor, and cefoxitin. These cephalosporins are less vulnerable to beta-lactamase inactivation than the ‘first-generation’ cephalosporins. As a result, they’re effective against germs that are resistant to other antibiotics, and they’re especially effective against Haemophilus influenzae.Cephalosporins of the third generation include cefotaxime, ceftazidime, and ceftriaxone. They are more effective against Gram-negative bacteria than second generation’ cephalosporins. They are, however, less effective against Gram-positive bacteria such Staphylococcus aureus than second-generation cephalosporins.
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This question is part of the following fields:
- Infections
- Pharmacology
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Question 30
Incorrect
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A 74-year-old woman with a history of ischaemic heart disease and heart failure is complaining of worsening oedema, bloating, and a loss of appetite. She has ascites and peripheral oedema on examination. Her oedema is being controlled by an oral diuretic, but it appears that this is no longer enough. You discuss her care with the on-call cardiology registrar, who believes she is very likely to have significant gut oedema that is interfering with her diuretic absorption and that she will need to change her medication.Which of the following oral diuretics is most likely to help you overcome this problem?
Your Answer:
Correct Answer: Bumetanide
Explanation:Bumetanide is primarily used in patients with heart failure who have failed to respond to high doses of furosemide. Bumetanide and furosemide differ primarily in terms of bioavailability and pharmacodynamic potency. In the intestine, furosemide is only partially absorbed, with a bioavailability of 40-50 percent. Bumetanide, on the other hand, is almost completely absorbed in the intestine and has a bioavailability of about 80%. As a result, when it has a better bioavailability than furosemide, it is commonly used in patients with gut oedema.When taken alone, Bendroflumethiazide is a moderately potent diuretic that is unlikely to control her oedema.Mannitol is a type of osmotic diuretic used to treat cerebral oedema and high intracranial pressure.Acetazolamide is a weak diuretic that inhibits carbonic anhydrase. It’s a rare occurrence.
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This question is part of the following fields:
- Cardiovascular Pharmacology
- Pharmacology
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