usmle questions

Repeated USMLE Questions Step 1- 308

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A 26-year-old man presents to the clinic with a complaint of recurrent episodes of bloating, flatulence and diarrhea following eating dairy products. He mentions that he does not experience these symptoms if he does not drink milk or if he is fasting. What is the most likely cause of diarrhea in this patient? A-Inflammatory B-Osmotic … Read more

Pharmacology MCQs- 229

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Studies are done on normal volunteers for phase 1 clinical trials of a new drug. The volume of distribution and clearance has been measured. The researchers now are calculating the half-life of the drug. Assuming that the volume of distribution is 60 L and the clearance is 3 L/hour, what is the approximate half-life of … Read more

Repeated USMLE Questions Step 1- 307

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A 32-year-old woman with a history of generalized anxiety disorder develops numbness of her face particularly around her mouth. Physical examination and x-ray show no abnormalities other than markedly increased respiratory rate. Laboratory investigations are as follows: PO2: 100 mmHg PCO2: 30 mmHg Bicarbonate: 18 mEq/L pH of blood: 7.51 Which of these findings shows … Read more

Pharmacology MCQs- 228

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A 40-year-old man who works in a manufacture of explosives presents to the clinic for a routine physical examination. Medical history reveals that the patient experiences episodes of headache and palpitation every Monday. Physical examination, laboratory tests and ECG show normal results. The patient questions if the chemicals related to his job could be responsible … Read more

Repeated USMLE Questions Step 1- 306

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A 37-year-old woman complains of watery diarrhea, abdominal cramps and periodic facial flushing for the last six months. Examination reveals bilateral wheezing and slightly enlarged liver. Urine analysis shows high levels of 5-hydroxyindoleacetic acid (5-HIAA). Multiple tumors are detected by a CT scan. What is the most likely primary site of these tumors? A-Colon B-Esophagus … Read more