Case-based MCQ

🧠 Case-based MCQ 🔸 #MCQ_53 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The Correct answer is C This patient's clinical features are most consistent with acute pancreatitis. Pancreatitis is characterized by: Persistent, moderate-to-severe epigastric abdominal pain Pain that radiates to the back and may be relieved by sitting up and leaning forward Nausea and vomiting Variable physical examination findings, which may range from minimal tenderness in the epigastric area to severe tenderness with guarding and rebound Gallstones and chronic alcohol abuse account for about 75% of cases of acute pancreatitis. Nearly one-third of patients have chest x-ray abnormalities, including pleural effusions, atelectasis, elevated hemidiaphragm, or pulmonary infiltrates. These complications are often due to activated pancreatic enzymes (e.g., phospholipase, trypsin) and cytokines (e.g., tumor necrosis factor) that are released from the pancreas into the circulation and cause focal or systemic inflammation. Other potential complications include ileus, acute respiratory distress syndrome, and renal failure. ❌Choice A is not correct: Infra-abdominal abscess often presents in a subacute or insidious fashion with fever, nausea, vomiting, and/or abdominal pain. This patient's acute symptom onset is less consistent with an abdominal abscess. ❌Choice B is not correct: Mesenteric ischemia usually presents with severe acute periumbilical abdominal pain that is out of proportion to findings on physical examination. Risk factors include advanced age, diffuse atherosclerosis, valvular abnormality, cardiac arrhythmias (i.e., atrial fibrillation), and recent myocardial infarction (MI). Mesenteric ischemia would be less likely than pancreatitis in a patient of this age, even with atherosclerotic risk factors. ❌Choice D is not correct: Acute MI (especially inferior MI) can occasionally present with nausea, vomiting, and epigastric pain. However, pain improving with sitting up or leaning forward is not consistent with MI, and abdominal tenderness is more characteristic of pancreatitis. ❌Choice E is not correct: Patients with perforated peptic ulcer usually complain of sudden-onset epigastric pain, nausea, vomiting, and hematemesis, and may show peritoneal signs (e.g., guarding, rigidity, rebound tenderness) on physical examination. Upright chest x-ray will show free air under the diaphragm. ✅Summarized Points: Acute pancreatitis is characterized by epigastric abdominal pain associated with nausea and vomiting. Alcohol abuse and gallstone disease are the most common causes. Potential complications include pleural effusion, acute respiratory distress syndrome, ileus, and renal failure.

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🧠 Case-based MCQ 🔸 #MCQ_53 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 A 47-year-old man comes to the emergency department with upper abdominal pain. He describes it as nagging and constant and rates it 6/10. The pain started 6 hours ago and was not relieved by over-the-counter antacids. It gets somewhat better when he sits up and leans forward. The patient has had 2 episodes of vomiting since the pain started. He smokes a pack of cigarettes daily. He drinks 4-6 cans of beer a day and several more on weekends. He does not use illicit drugs. The patient's temperature is 37.8 C (100 F), blood pressure is 100/70 mm Hg, pulse is 110/min, and respirations are 20/min. Abdominal examination shows mild epigastric tenderness without guarding or rebound. Electrocardiogram shows sinus tachycardia and T-wave inversion in leads V4-V6. Chest x-ray shows a small left-sided pleural effusion. Which of the following is the most likely diagnosis in this patient? A. Intra-abdominal abscess B. Mesenteric ischemia C. Acute pancreatitis D. Myocardial infarction E. Peptic ulcer perforation

🧠 Case-based MCQ 🔸 #MCQ_52 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The Correct answer is A Euthyroid sick syndrome (ESS) encompasses a variety of alterations in thyroid physiology, the most common of which is termed "low T3 syndrome" and is thought to be primarily the result of decreased conversion of T4 to T3. T4 is produced exclusively in the thyroid gland, whereas T3 is produced mainly by peripheral conversion of T4 by deiodination. Factors in acute illness that inhibit peripheral deiodination include high endogenous cortisol levels, inflammatory cytokines (e.g., tumor necrosis factor), starvation, and certain medications (e.g., glucocorticoids, amiodarone). TSH and T4 levels are often normal in ESS, although they also may fall in severe or prolonged cases, and ESS may represent transient central hypothyroidism rather than a true euthyroid state. The patient's results showing low T3, normal free T4, and normal TSH are consistent with ESS due to sepsis. ESS is considered by some experts to be an adaptive response to stress, and thyroid hormone supplementation in ESS has not been found to improve clinical outcomes. ❌Choice B is not correct: Antithyroid peroxidase antibodies are a marker for chronic lymphocytic (Hashimoto) thyroiditis. They are also a predictor of progression to overt hypothyroidism in patients with subclinical hypothyroidism (normal T4, elevated TSH). They are not useful in the acute evaluation of patients with normal TSH. ❌Choice C is not correct: Reverse T3 (rT3) is an inactive metabolite of T4. In severe nonthyroidal illness (e.g., ESS), clearance of rT3 is reduced and levels will be elevated. rT3 is primarily used in patients with low TSH to differentiate central hypothyroidism (low T4 leads to low rT3) from ESS. ❌Choice D is not correct: Treatment should therefore be deferred unless abnormal thyroid function persists after the patient has returned to baseline health. ❌Choice E is not correct: T3 has a very short half-life, and treatment with liothyronine (oral T3 supplement) produces wide fluctuations in blood levels. Therefore, liothyronine supplementation is not recommended for routine use. ✅Summarized Points: Euthyroid sick syndrome is often characterized by low T3 levels with normal TSH and T4 in patients with acute illness. It is primarily due to decreased peripheral conversion of T4 to T3. Treatment is not recommended unless abnormal thyroid function persists after the patient has returned to baseline health.

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🧠 Case-based MCQ 🔸 #MCQ_52 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 A 54-year-old man has been in the intensive care unit for the past 10 days recovering from an exploratory laparotomy performed for a perforated duodenal ulcer. Postoperatively he developed pneumonia and sepsis. His thyroid hormone studies are abnormal. He does not have any previous history of thyroid disease. Physical examination of the thyroid gland is normal. Labs show:   Thyroid-stimulating 2 µU/mL (0.4-5.0)   Free thyroxine (T4), serum 60 nmol/L (60-145)   Triiodothyronine (T3), serum 0.7 nmol/L (1.1-3.0)   Which of the following is the best next step in the management of this patient's thyroid abnormalities? A. Repeat thyroid function tests in 8 weeks B. Assay for antithyroid peroxidase antibody C. Measure reverse T3 level D. Start levothyroxine (T4) therapy E. Start liothyronine (T3) therapy

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🧠 Case-based MCQ 🔸 #MCQ_51 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The Correct answer is D Mittelschmerz is a common, benign phenomenon in women of reproductive age that is caused by follicular enlargement or rupture of the follicular cyst during ovulation, which leads to the release of small amounts of intraperitoneal fluid and subsequent peritoneal irritation. The pain is self-limited and usually subsides within hours to two days. Patients should be reassured and receive symptomatic treatment with nonsteroidal anti-inflammatory drugs (NSAIDs) as needed.   Choice A is not correct: A CT scan of the pelvis can be considered in patients with pelvic pain and abnormal findings (e.g., tenderness to palpation) if the diagnosis remains uncertain after laboratory evaluation and other imaging modalities are unavailable or inconclusive. This is, however, not the case in this patient. Furthermore, due to the radiation exposure associated with a CT scan, it is not the preferred imaging method for the evaluation of a young patient's reproductive organs. ❌Choice B is not correct: Diagnostic laparoscopy is indicated in patients with acute pelvic pain, if the diagnosis cannot be established with less invasive methods or if a surgical condition (e.g., appendicitis, ovarian torsion) is suspected. This patient has episodic pain and a normal abdominal and pelvic exam. Therefore, invasive diagnostic methods are not warranted at this time. ❌Choice C is not correct: Combined oral contraceptive pills can be used in the management of a variety of gynecological conditions such as primary dysmenorrhea. Although primary dysmenorrhea also commonly presents with episodic pelvic pain in adolescent women with a normal physical examination, the pain typically occurs immediately before or at the onset of the menstrual period, rather than midcycle as in this patient. ❌Choice E is not correct: Pelvic ultrasonography should be performed in postmenarchal adolescents with pelvic pain and adnexal mass or tenderness on examination to evaluate for ovarian cysts, ovarian torsion, and gynecological neoplasms. Although this patient complains of pelvic pain, her examination shows no abnormalities. Imaging is, therefore, not indicated at this time. ✅Summarized Points: Recurrent midcycle, unilateral, lower abdominal pain in an adolescent girl is suggestive of mittelschmerz.

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🧠 Case-based MCQ 🔸 #MCQ_51 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 A 17-year-old girl comes to the physician because of left lower abdominal pain for 1 day. She describes the pain as 6 out of 10 in intensity. Over the past 5 months, she has had similar episodes of pain that occur once a month and last 1 to 2 days. Menses occur at regular 28-day intervals and last 5 to 6 days. Menarche was at the age of 13 years, and her last menstrual period was 2 weeks ago. She has been sexually active with 1 male partner in the past and has used condoms inconsistently. She tested negative for sexually transmitted infections on her last visit 6 months ago. Abdominal and pelvic examination shows no abnormalities. A urine pregnancy test is negative. Which of the following is the most appropriate next step in the management of this patient's symptoms?   A. CT scan of the pelvis B. Diagnostic laparoscopy C. Combined oral contraceptive pill D. Reassurance E. Pelvic ultrasonography

🧠 Case-based MCQ 🔸 #MCQ_50 🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤🔤 The Correct answer is B This patient's symptoms for the last 2 weeks are suggesting acute bacterial rhinosinusitis (ABRS).Acute rhinosinusitis is the symptomatic inflammation of the nasal and sinus mucosa for <4 weeks. The majority of cases are due to viral upper respiratory pathogens (e.g., influenza virus, rhinovirus, adenovirus) and resolve within 10 days. However, 2%-10% of patients develop a secondary bacterial infection, most commonly with Streptococcus pneumoniae, Haemophilus influenzae, or Moraxella catarrhalis. Diagnosis of ABRS is typically made when ≥1 of the following is present: Persistent symptoms/signs of rhinosinusitis for >10 days Severe symptoms, high fever (>39 C [102.2 F]), purulent nasal discharge, and/or facial pain for >3 consecutive days "Double sickening" - initial improvement of viral upper respiratory symptoms for 5-6 days, followed by clinical deterioration (e.g., worsened fever, headache, nasal discharge) Patients with ABRS are usually treated with 5-7 days of oral amoxicillin-clavulanate to reduce symptom duration. Intranasal saline irrigation and analgesics are also often recommended ❌Choice A is not correct: Reassurance and supportive treatment with antipyretics, analgesics, and nasal decongestants are usually sufficient in the treatment of patients with viral rhinosinusitis. However, because this patient has had symptoms for more than 10 days and a mucopurulent discharge suggestive of a bacterial infection, a different treatment is indicated. ❌Choice C is not correct: A CT scan of the paranasal sinuses is not routinely performed in acute sinusitis. It may be used if complications (e.g., osteomyelitis, orbital cellulitis) occur, to rule out differential diagnoses (e.g., neoplasms), or preoperatively in patients with chronic sinusitis (e.g., surgical debridement of necrotic tissue and/or removal of anatomical obstructions). ❌Choice D is not correct: X-ray of the sinuses is usually not recommended in acute sinusitis because it does not help to differentiate between etiologies, and findings from it rarely influence the choice of treatment. ❌Choice E is not correct: Patients with poorly controlled diabetes mellitus (particularly with ketoacidosis) are at risk for rhino-orbital mucormycosis, which is treated with intravenous fungal medications (e.g., Amphotericin B). Manifestations typically progress rapidly and include fever, nasal necrosis, facial swelling, sinusitis, and headache. This patient is on antidiabetic mediations likely has well-controlled diabetes mellitus; he would be at low risk for mucormycosis. ✅Summarized Points: Acute rhinosinusitis is most commonly due to viral pathogens and usually resolves within 10 days. Patients with persistent symptoms >10 days, severe symptoms, or deterioration after several days of improvement often have acute bacterial rhinosinusitis, which is usually treated empirically with 5-7 days of oral amoxicillin-clavulanate. 

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