Case-based MCQ

🧠 Case-based MCQ 🔸 #MCQ_58 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The Correct answer is A: Internal hemorrhoids are highly vascularized submucosal cushions located in the anal canal. They are classified as: First degree if no prolapse is present. Second degree if prolapse occurs with spontaneous reduction. Third degree if they require manual reduction. Fourth degree if they are irreducible. Treatment is based on the symptoms and degree of prolapse. Nearly all patients with first- and second degree hemorrhoids should initially be placed on a trial of conservative measures including a bowel management program with high fiber diet to avoid straining and constipation, frequent warm baths, and an anti-inflammatory topical cream. ❌Choice B, C, D are not correct: If symptoms continue, both rubber band ligation (a small rubber band is placed at the neck of the hemorrhoid resulting in eventual death and detachment of tissue) and infrared coagulation (controlled burn of the vessels at the neck of the hemorrhoid) are good alternatives to surgical therapy. ❌Choice E is not correct: For refractory first- and second-degree hemorrhoids, most third-degree and all fourth-degree hemorrhoids, surgical hemorrhoidectomy is the treatment of choice. ✅Summarized Points: The best initial therapy for first and second degree internal hemorrhoid is conservative measures such as High fiber diet, frequent sitz baths, and topical steroid ointment.

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🧠 Case-based MCQ 🔸 #MCQ_58 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 A 46-year-old male truck driver presents for evaluation of bright red rectal bleeding with bowel movements. He also has the feeling that something protrudes through his anus while he strains to move his bowels but that it withdraws into the bowel when he relaxes. He has no abdominal pain, weight loss, or other symptoms. A colonoscopy reveals no polyps or tumors but does note internal hemorrhoids. Which of the following is the best initial treatment for him? A. High fiber diet, frequent sitz baths, and topical steroid ointment B. Rubber band ligation C. Sclerotherapy injection D. Infrared coagulation E. Surgical hemorrhoidectomy

🧠 Case-based MCQ 🔸 #MCQ_57 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The correct answer is A. The ECG shows sinus bradycardia and Osborn waves in the setting of environmental exposure that led to profound hypothermia. Osborn waves are characterized by a positive J-point deflection in the precordial leads with reciprocal negative J-point deflection in leads aVR and V1. They are not pathognomonic for hypothermia but are commonly seen with core temperatures < 32°C. Other ECG abnormalities associated with hypothermia include shivering artifact, prolonged QTc interval, low voltage, ventricular dysrhythmias, and bradydysrhythmias, including slow junctional rhythms, atrioventricular blocks, and atrial fibrillation with slow ventricular response. Treatment with antidysrhythmics, atropine, and transcutaneous pacing can be considered, but these cardiac abnormalities usually resolve with warming alone. ❌Choice B is not correct: An accessory electrical pathway, as seen in Wolff-Parkinson-White syndrome, will result in short PR intervals and delta waves. ❌Choice C is not correct: Arrhythmogenic right ventricular cardiomyopathy (ARVC) can lead to sudden cardiac death in young adults and is associated with epsilon wave, a small positive deflection at the end of the QRS complex. Treatment for ARVC includes antidysrhythmic drugs, anticoagulation, insertion of implantable cardioverter-defibrillator, and in severe cases, heart transplantation. ❌Choice D is not correct: Transmural myocardial ischemia caused by sudden and complete occlusion of a coronary artery will result in ST segment elevations within the affected region. Those types of changes are not evident in the above ECG. ✅Summarized Points: Osborn waves produce prominent convex deflections at the J point (junction of QRS and ST segments) that are best seen in the precordial leads. The J waves or Osborn waves are characteristic of severe hypothermia and resolve with rewarming.

🧠 Case-based MCQ 🔸 #MCQ_57 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 A 27-year-old man is brought to the emergency department by paramedics after being found minimally responsive on the street. There is no evidence of traumatic injuries on physical exam. Blood glucose level is 6.9 mmol/L (3.3‐5.8). Which of the following conditions is associated with the patient’s clinical presentation and the ECG shown below? A. Environmental exposure B. Accessory electrical pathway C. Right ventricular cardiomyopathy D. Transmural myocardial ischemia

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🧠 Case-based MCQ 🔸 #MCQ_57 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The Correct answer is D As history and examination cannot distinguish between viral and bacterial infection in young infants, all febrile infants age ≤60 days should undergo a full sepsis evaluation with blood, urine, and cerebrospinal fluid cultures. Infectious manifestations are often subtle at this age (e.g., fever can be the only symptom), though some infants may have hypothermia, lethargy, poor feeding, or decreased urine output. Regardless of initial laboratory data, all febrile infants age ≤60 days should be hospitalized. As culture data are pending, empiric intravenous antibiotics should be administered empirically based on the infant's age. Group B Streptococcus (GBS) and Escherichia coil are the most common pathogens in patients age <28 days. Patients are also evaluated for Listeria monocytogenes as it is potentially devastating even though far less common. The recommended empiric regimen is ampicillin plus either gentamicin or cefotaxime. Ampicillin provides good coverage for GBS and L monocytogenes. E Coli Is often resistant to ampicillin but usually sensitive to gentamicin or cefotaxime. Cefotaxime is often used when meningitis is suspected, owing to better penetration of the cerebrospinal fluid. ❌Choice A and B are not correct: Ampicillin should be included, but ceftriaxone is generally avoided in infants age ≤28 days as it can potentially displace bilirubin from albumin-binding sites and increase the risk for kernicterus. Cefotaxime does not increase the risk for hyperbilirubinemia. ❌Choice C is not correct: Vancomycin is indicated when there is a high risk of Streptococcus pneumoniae meningitis in infants age >28 days and/or when methicillin-resistant Staphylococcus aureus (MRSA) is suspected (e.g., due to pre-existing influenza infection and concurrent skin and soft-tissue infection). MRSA is not a common pathogen in neonatal sepsis. Ceftriaxone can potentially displace bilirubin from albumin-binding sites in infants age ≤28 days and increase the risk for kernicterus. ❌Choice E is not correct: Oral antibiotics are inappropriate at the outset as bacteria can rapidly spread hematogenously to vital organs. ✅Summarized Points: All febrile infants age <60 days should undergo blood, urine, and cerebrospinal fluid evaluation. Fever may be the only manifestation of a serious bacterial infection. When culture results are pending, ampicillin plus either gentamicin or cefotaxime should be given to cover Group B Streptococcus, Escherichia coli, and Listeria monocytogenes

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🧠 Case-based MCQ 🔸 #MCQ_57 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 A 12-day-old girl is brought to the emergency department for fever. The infant seems sleepier than usual and is less interested in feeding today. The patient was born full-term by spontaneous labor and vaginal delivery and had an uneventful nursery course. Her mother's prenatal laboratory results were normal, and the group B Streptococcus screen was negative. The patient's temperature is 38.3 C (101 F), blood pressure is 84/44 mm Hg, pulse is 162/min, and respirations are 42/min. Examination shows a sleepy but arousable infant She breastfeeds for 15 minutes in the emergency department without difficulty. Complete blood count, urinalysis, and cerebrospinal fluid profile are normal. Blood, urine, and cerebrospinal fluid cultures are pending. Which of the following is the most appropriate next step in the management of this infant?   A. Intramuscular ceftriaxone B. Intravenous ampicillin plus ceftriaxone C. Intravenous vancomycin plus ceftriaxone D. Intravenous ampicillin plus gentamicin E. Oral cephalexin

🧠 Case-based MCQ 🔸 #MCQ_56 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The Correct answer is D When taken in excess, medications for Alzheimer's disease such as donepezil can result in symptoms similar to that of organophosphate poisoning. In such cases, pralidoxime is given to restore activity of acetylcholinesterase, which then catalyzes the breakdown of excessive acetylcholine to reverse symptoms. Atropine does not act on nicotinic cholinergic receptors and thus cannot treat symptoms of neuromuscular dysfunction, for which pralidoxime is still necessary. Pralidoxime has poor blood-brain barrier penetration and can lead to a transient worsening of acetylcholinesterase inhibition following administration, which is why atropine is typically administered first to treat CNS symptoms and prevent further acetylcholinesterase inhibition.   ❌Choice A is not correct: Carbachol directly binds to acetylcholine receptors of both muscarinic and nicotinic type and is used in the treatment of glaucoma. It would further exacerbate this patient's symptoms of acetylcholine excess and must be avoided in this patient. ❌Choice B is not correct: Physostigmine can be used as an antidote in atropine overdose or as a treatment for myasthenia gravis. However, in this patient with symptoms of acetylcholine excess, it would lead to exacerbation of this patient's symptoms by further increasing cholinergic stimulation. ❌Choice C is not correct: Pancuronium belongs to the class of nondepolarizing muscle relaxants that bind to acetylcholine receptors at the neuromuscular junction, which blocks nicotinic stimulation by acetylcholine. Even though the administration of pancuronium would lead to a reversal of neuromuscular symptoms in this patient, muscular paralysis and possibly even respiratory impairment would result. The risks of pancuronium, therefore, outweigh its potential benefits, especially considering that safer alternatives are available. ❌Choice E is not correct: Benztropine is a selective antagonist of muscarinic receptors that particularly decreases cholinergic overactivity in the CNS. It is typically used to treat tremor in Parkinson disease and extrapyramidal symptoms caused by antipsychotics. However, since this patient's muscarinic symptoms have mostly resolved following the administration of atropine, an additional muscarinic inhibitor would not be particularly useful. ✅Summarized Points: This patient presents with symptoms of muscarinic acetylcholine excess (e.g., diarrhea, diaphoresis, bradycardia, bronchospasm, salivation, lacrimation, miosis) and nicotinic acetylcholine excess (e.g., muscle weakness). Atropine can only reverse the muscarinic effects.

🧠 Case-based MCQ 🔸 #MCQ_55 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 A 61-year-old man with Alzheimer's disease is brought to the emergency department 20 minutes after ingesting an unknown amount of his medications in a suicide attempt. He reports abdominal cramps, diarrhea, diaphoresis, and muscular weakness and spasms in his extremities. His temperature is 38.4°C (101.1°F), pulse is 51/min, respirations are 12/min and labored, and blood pressure is 88/56 mm Hg. Physical examination shows excessive salivation and tearing, and small pupils bilaterally. Treatment with atropine is initiated. Shortly after, most of his symptoms have resolved, but he continues to have muscular spasms. Administration of which of the following is the most appropriate next step in management of this patient? A. Carbachol B. Physostigmine C. Pancuronium D. Pralidoxime E. Benztropine

🧠 Case-based MCQ 🔸 #MCQ_55 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The Correct answer is E Peritonsillar abscess (PTA) is a potential complication of untreated streptococcal pharyngitis. This patient's fever, dysphagia, unilateral peritonsillar swelling, uvula deviation away from the swollen tonsil, trismus, and voice changes are concerning for PTA. In addition to Streptococcus pyogenes (group A Streptococcus), the abscess is usually comprised of Staphylococcus aureus and respiratory anaerobes. When the diagnosis is suspected on examination, the patient should be referred to an otolaryngologist for needle aspiration, incision and drainage, or tonsillectomy. If the patient is cooperative, needle aspiration is the procedure of choice as it is better tolerated as an outpatient, less painful, and less invasive than incision and drainage. If possible, broad-spectrum parenteral antibiotics are recommended after diagnostic and therapeutic needle aspiration so that culture data are not obscured. Patients can switch to oral antibiotics after clinical improvement and fever resolution. Drainage, antibiotics, analgesia, and hydration result in resolution in >90% of cases. Delays in treatment can result in complications such as airway obstruction or infection spread from the peritonsillar space to other deep neck spaces and the bloodstream. ❌Choice A is not correct: Although airway obstruction is a potentially fatal, albeit rare, complication of PTA, endotracheal intubation is not indicated in this patient given the lack of stridor, dyspnea, or other signs of acute airway obstruction. ❌Choice B is not correct: To avoid obscuring culture data, broad-spectrum parenteral antibiotics are recommended after diagnostic and therapeutic needle aspiration. After clinical improvement and fever resolution, patients can transition to oral antibiotics. ❌Choice C and D are not correct: Neck imaging is not necessary given the classic clinical features of peritonsillar abscess in this patient. In patients with severe trismus, when the posterior oropharynx cannot be adequately visualized or if there is a concern for spread beyond the peritonsillar space, CT with intravenous contrast is the preferred imaging modality for delineating infections of the deep neck space. X-ray does not provide enough soft tissue detail. ✅Summarized Points: Peritonsillar abscess is a potential complication of streptococcal pharyngitis. Classic findings include dysphagia, unilateral peritonsillar swelling, uvula deviation, and trismus. The purulence should be drained promptly and broad-spectrum antibiotics administered intravenously

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🧠 Case-based MCQ 🔸 #MCQ_54 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 A 15-year-old girl comes to the physician with 4 days of fever and worsening sore throat, voice changes, and difficulty opening her mouth. She has prescribed antibiotics for streptococcal pharyngitis 2 days ago but did not take the pills due to difficulty swallowing. The patient has no underlying health problems, takes no medications, and her immunizations are up-to-date. Her temperature is 39.4 C (103 F), blood pressure is 115/64 mm Hg, pulse is 110/min, and respirations are 17/min. Oral examination is somewhat limited due to trismus, but an inflamed oropharyngeal mucosa, 4+ right tonsil covered with exudates, and leftward uvula deviation are seen. Multiple small, mobile, and tender lymph nodes are palpable in the right neck. Her voice is muffled but she has no stridor. Lung, cardiac, and abdominal examinations are normal. Which of the following is the best next step in the management of this patient? A. Endotracheal intubation B. Intravenous antibiotics C. Neck CT scan with contrast D. Neck x-ray E. Tonsillar needle aspiration