Free Questions and Answers for All Medical Students all over the World
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
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
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
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
A 45-year-old woman is sent to the emergency room from a vision center after examining her eyes to get new glasses. While she was in the waiting room, she developed severe ocular pain in her right eye and she started seeing halos around light. Which of these agents most likely is the reason for this … Read more
A week old female presents for her first checkup. Examination reveals jaundice and splenomegaly. Laboratory investigations show: Total bilirubin level: 27 mg/dL Direct bilirubin: 0.6 mg/dL Hgb: 10.1 g/dL Reticulocytes: 6% A blood smear shows burr cells and spherocytosis. Which of these tests will be positive in this patient? A-Acid hemolysis test B-Coomb’s test C-Osmotic … Read more