USMLE Step 1

A 55-year-old man has a long history of liver cirrhosis visits his physician with a new complaint. Recently he noticed abnormal lesion on his abdomen. His physician recognized these lesions as caput medusae. Which veins are most likely involved in this case? A- Azygos and hemiazygos veins B- Esophageal venous plexus C- Paraumbilical and epigastric … Read more

A 22-year-old man visits his physician for evaluation of new symptoms after the use of isoniazid treatment for TB. His skin is inflamed, had diarrhea and feeling like not himself. What is the vitamin deficiency responsible for this patient’s new symptoms? A- Thiamine deficiency B- Riboflavin deficiency C- Niacin deficiency D- Folic acid deficiency E- … Read more

A 54 year old man presents to the emergency room complaining of progressive shortness of breath for 3 weeks. He has a long history of left sided heart failure treated by enalapril. Chest x-ray reveals bilateral pulmonary edema. After receiving the appropriate treatment, he is hospitalized for further investigations. Which of these findings is most … Read more

The World Health Organization develops health care services to help low-economic countries to improve the quality of primary health care for elderly people. What is the most common cause of death in low-economic countries? A- Diarrheal diseases B- Lower respiratory tract infections C- HIV/AIDS D- Ischemic heart disease E- Stroke Answer: The most common cause … Read more

A 23-year-old man presents to the emergency room complaining of massive watery diarrhea for 6 hours. He doesn’t have any vomiting or abdominal pain. Stool culture reveals a curved; gram negative rod which secretes an enterotoxin contains subunit A and a binding subunit B. What is the most likely reason for this patient’s massive diarrhea? … Read more