Repeated USMLE Questions Step 1 (80)

A 27 year-old man presents with a movement disorder characterized by restlessness and a compelling needs to be in a constant motion. He had a diagnosis of psychosis two weeks ago and he started treatment right after his last visit. What is the most likely diagnosis? A- Restless leg syndrome B- Dystonia C- Akathisia D- [...]

By | November 19th, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (79)

A 54-year-old man complains of sudden onset of severe chest tearing pain. The pain started an hour ago and radiating to his upper back. On physical examination, his pulse is 90/min., his blood pressure in his left arm is 140/90 while it is 110/70 in his right arm. Chest x-ray shows widening of the mediastinum. [...]

By | November 13th, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (78)

A 13-year-old boy with a history of sickle cell disease complains of severe pain in his right leg. History, physical examination and radiology reveal diagnosis of osteomyelitis. What is the causative organism most likely responsible for this infection? A-Listeria monocytogenes B-Pseudomonas aeruginosa C-Salmonella enteritidis D-Serratia marcescens E-Streptococcus viridans Answer: Salmonella enteritidis is the most likely [...]

By | November 6th, 2016|USMLE Step 1|2 Comments

Repeated USMLE Questions Step 1 (77)

A 42-year-old woman with a history of renal insufficiency visits her physician with a recent respiratory tract infection. Her physician wants to prescribe antibiotic for her infection. Which of these antibiotics does NOT need adjustment because of her renal insufficiency? A-Cefazolin B-Cefoxitin C-Ceftriaxone D-Cephalexin E-Fosfomycin Answer: The only drug of the listed ones that is [...]

By | November 1st, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (76)

A 33-year-old man presents to his physician to discuss his plans for treatment of hyperthyroidism. One of the options is potassium perchlorate. What is the mechanism of action of potassium perchlorate as anti-thyroid? A-Blocking of coupling of iodo-tyrosines B-Blocking of peroxidase catalyzed reactions C-Blocking of peripheral deiodination of T3 and T4 D-Competitive inhibition of iodide [...]

By | October 30th, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (75)

Workers in the aniline dye industry are more susceptible to bladder cancer than general population. Studies show that animals, when exposed to beta-naphthylamine develop liver cancer but not bladder cancer. What is the most likely explanation of this finding A-Metabolism of beta-naphthylamine by human cytochrome 450 system in the liver B-Detoxification of beta-naphthylamine by glucuronic [...]

By | October 26th, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (74)

A 23-year-old man from Southwestern Africa develops hemolytic anemia after taking primaquine, malarial prophylactic drug. what is the enzyme deficiency? A- Aldolase B- Glucose-6-phosphate dehydrogenase C- Isocitrate dehydrogenase D- Lactate dehydrogenase E- Uridyl transferase Answer: Glucose-6-phosphate dehydrogenase is the rate limiting enzyme in HMP shunt. Its deficiency leads to low levels of NADPH which is [...]

By | October 22nd, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (73)

A 13-year-old girl, refugee from Syria, presents for a routine medical examination. She has a history of rheumatic fever. She complains of mild shortness of breath when she exercises in gem class. She is absent of school for 3 weeks and her parents explain that she has multiple absentees because they are worried that she [...]

By | October 11th, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (72)

A 2-year old girl is presented with rectal bleeding. Her mom noticed blood in her BM yesterday and was worried about it and she decided to go to your clinic to examine her daughter. There is no pain, nausea or vomiting. The girl is healthy and her routine physical examination 2 months ago was normal. [...]

By | October 7th, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (71)

A 54 year-old man with a history of chronic obstructive pulmonary disease (COPD) presents by his son to the emergency room semi-unconscious with shortness of breath. He has nausea, diarrhea and restlessness for the last four hours.  His arterial oxygen saturation is 88% with room air. His ECG shows normal sinus rhythm with non-specific changes [...]

By | October 4th, 2016|USMLE Step 1|0 Comments