A 65 y/o post-MI patient on loop diuretics becomes oliguric. Labs show serum urea 16 mmol/L, creatinine 220 µmol/L, and urine Na+ <20 mmol/L. What is the most likely cause of his acute kidney injury?
Anonymous Quiz
26%
Acute tubular necrosis
63%
Prerenal hypoperfusion
11%
Acute interstitial nephritis
0%
Postrenal obstruction
Maxemo EMREE 26-27
A 65 y/o post-MI patient on loop diuretics becomes oliguric. Labs show serum urea 16 mmol/L, creatinine 220 µmol/L, and urine Na+ <20 mmol/L. What is the most likely cause of his acute kidney injury?
💡 EXPLANATION:
Prerenal AKI is characterized by a disproportionately elevated urea, oliguria, and urine Na+ <20 mmol/L due to intact tubular sodium reabsorption in response to hypoperfusion from low cardiac output or diuretics.
A 30 y/o man is brought to the ED after prolonged heat exposure in the desert. Urine is dark brown; dipstick is positive for blood but microscopy shows no RBCs. Serum creatinine is elevated. Which mechanism best explains his renal failure?
Anonymous Quiz
60%
Tubular obstruction and oxidative damage by myoglobin
15%
Autoimmune destruction of the glomerular basement membrane
20%
Direct ischemic injury to the renal papillae
5%
Interstitial inflammation secondary to an allergic reaction
Maxemo EMREE 26-27
A 30 y/o man is brought to the ED after prolonged heat exposure in the desert. Urine is dark brown; dipstick is positive for blood but microscopy shows no RBCs. Serum creatinine is elevated. Which mechanism best explains his renal failure?
💡 EXPLANATION:
Heat stroke caused rhabdomyolysis, releasing myoglobin. Myoglobin is filtered by the kidneys, causing direct oxidative toxicity and tubular obstruction, leading to acute tubular necrosis. The dipstick detects myoglobin as false-positive blood.
A 50 y/o diabetic man presents with a BP of 140/90 mmHg and microalbuminuria (45 mg/day). Which medication is the most appropriate next step to slow the progression of his renal disease?
Anonymous Quiz
29%
Start amlodipine
57%
Start lisinopril
14%
Start furosemide
0%
Start metoprolol
Maxemo EMREE 26-27
A 50 y/o diabetic man presents with a BP of 140/90 mmHg and microalbuminuria (45 mg/day). Which medication is the most appropriate next step to slow the progression of his renal disease?
💡 EXPLANATION:
Lisinopril (an ACE inhibitor) is the drug of choice for diabetic patients with microalbuminuria. It slows nephropathy progression by dilating the efferent arteriole, thereby reducing intraglomerular pressure.
A 62 y/o man presents with acute onset right-sided facial droop, right arm weakness, and expressive aphasia. Which of the following is the most likely occluded vessel?
Anonymous Quiz
67%
Left middle cerebral artery
19%
Right middle cerebral artery
5%
Left anterior cerebral artery
10%
Left posterior cerebral artery
Maxemo EMREE 26-27
A 62 y/o man presents with acute onset right-sided facial droop, right arm weakness, and expressive aphasia. Which of the following is the most likely occluded vessel?
💡 EXPLANATION:
Left MCA occlusion classically presents with contralateral (right-sided) facial and upper extremity weakness, along with expressive (Broca's) aphasia due to involvement of the dominant cerebral hemisphere.
A 40 y/o F presents with a sudden, worst headache of her life during exertion, followed by vomiting. Non-contrast head CT reveals blood in the basal cisterns. What is the most appropriate next step in investigation?
Anonymous Quiz
23%
Lumbar puncture
31%
Magnetic resonance imaging
46%
Computed tomography angiography
0%
Electroencephalogram
Maxemo EMREE 26-27
A 40 y/o F presents with a sudden, worst headache of her life during exertion, followed by vomiting. Non-contrast head CT reveals blood in the basal cisterns. What is the most appropriate next step in investigation?
💡 EXPLANATION:
Non-contrast CT is the initial test for subarachnoid hemorrhage. Once confirmed, computed tomography angiography (CTA) is the immediate next step to identify the source of bleeding (e.g., ruptured aneurysm) prior to surgical intervention.
A 28 y/o F with Myasthenia Gravis presents to the ED with sudden severe respiratory weakness following recent antibiotic use. Pupils are normal. What is the most appropriate next step in management?
Anonymous Quiz
29%
Administer intravenous edrophonium
50%
Perform endotracheal intubation
13%
Administer intravenous immunoglobulin
8%
Increase pyridostigmine dosage
Maxemo EMREE 26-27
A 28 y/o F with Myasthenia Gravis presents to the ED with sudden severe respiratory weakness following recent antibiotic use. Pupils are normal. What is the most appropriate next step in management?
💡 EXPLANATION:
In a myasthenic crisis presenting with severe respiratory weakness, securing the airway via endotracheal intubation is the immediate first priority to prevent respiratory failure.
DAILY FOCUS TEST (DFT)
🔬 Today's Test: BIOSTATISTICS
👉 https://app.maxemo.app/s/dft-emree
Yesterday's Ranks🏆
INTERNAL MEDICINE
1. Reyansh Malhotra
2. Rizwan H
3. Sara
4. Samyak99
5. anjali
6. Silverlin
7. Shruti p
8. Siddharth Sharma
9. Mahmoud_k
10. Ahmed
⏳ Test Ends at 07:00 PM
Join channel 👇
https://t.me/studywithmaxemoemree
🔬 Today's Test: BIOSTATISTICS
👉 https://app.maxemo.app/s/dft-emree
Yesterday's Ranks🏆
INTERNAL MEDICINE
1. Reyansh Malhotra
2. Rizwan H
3. Sara
4. Samyak99
5. anjali
6. Silverlin
7. Shruti p
8. Siddharth Sharma
9. Mahmoud_k
10. Ahmed
⏳ Test Ends at 07:00 PM
Join channel 👇
https://t.me/studywithmaxemoemree
A 68 y/o M presents with a resting tremor, rigidity, bradykinesia, and a shuffling gait. Which of the following is the primary pathophysiological mechanism underlying his condition?
Anonymous Quiz
80%
Decreased dopamine leading to increased acetylcholine tone
8%
Degeneration of upper and lower motor neurons
4%
Autoimmune destruction of acetylcholine receptors
8%
Reduced gamma-aminobutyric acid (GABA) in the striatum
Maxemo EMREE 26-27
A 68 y/o M presents with a resting tremor, rigidity, bradykinesia, and a shuffling gait. Which of the following is the primary pathophysiological mechanism underlying his condition?
💡 EXPLANATION:
Parkinson disease results from dopaminergic neuron loss in the substantia nigra. Decreased dopamine causes a relative increase in acetylcholine tone, leading to motor inhibition and the classic triad of tremor, rigidity, and bradykinesia.
A 22 y/o man presents with ascending weakness and absent reflexes 1 week after a diarrheal illness. CSF analysis shows high protein with normal WBC count. Which of the following best describes the underlying pathology?
Anonymous Quiz
4%
Degeneration of motor neurons in the anterior horn
50%
Autoimmune demyelination of peripheral nerves
29%
Autoimmune demyelination of central nervous system
17%
Antibody-mediated blockade of acetylcholine receptors
Maxemo EMREE 26-27
A 22 y/o man presents with ascending weakness and absent reflexes 1 week after a diarrheal illness. CSF analysis shows high protein with normal WBC count. Which of the following best describes the underlying pathology?
💡 EXPLANATION:
Guillain-Barré syndrome is a post-infectious autoimmune condition causing demyelination of peripheral nerves. Diagnosis is supported by albuminocytologic dissociation (elevated protein with normal WBC) on CSF analysis.
A 4 y/o boy presents with a 2/6 systolic murmur at the left lower sternal border. The murmur intensity decreases upon standing and increases when lying supine. He is otherwise asymptomatic. What is the most likely diagnosis?
Anonymous Quiz
17%
Ventricular septal defect
21%
Atrial septal defect
25%
Innocent murmur
38%
Mitral valve prolapse
A 9 y/o girl presents with migratory polyarthritis and painless subcutaneous nodules. Which laboratory test provides the essential evidence to confirm the underlying diagnosis?
Anonymous Quiz
22%
Rheumatoid factor level
9%
Antinuclear antibody (ANA)
70%
Anti-streptolysin O (ASO) titer
0%
Erythrocyte sedimentation rate (ESR)