Repeated USMLE Questions Step 1 (90)

A 23-year-old woman represents to her physician with ptosis, meiosis and anhidrosis in the left eye. Which one of the following drugs is used to determine whether this lesion is preganglionic or postganglionic? A-Albuterol B-Atenolol C-Cocaine D-Epinephrine E-Phenylephrine Answer: This is a typical case of Horner’s syndrome. Indirect sympathomimetic drugs such as cocaine act on [...]

By | March 3rd, 2017|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (89)

A 12-year-old boy was brought to the emergency room after he sustained a crush injury in a car accident. His condition stabilized after 6 hours but he becomes oliguric and his urine is brown in color. Diagnosis of rhabdomyolysis is suspected. Which one of these conditions is most likely found in this patient? A-Hypercalcemia B-Hypocalcemia [...]

By | February 27th, 2017|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (88)

An American couple decide to travel to Sub Saharan Africa this summer. They visit their family physician for prophylaxis against malaria. Their past history indicates that they both had severe nausea and dizziness when they took mefloquine in a previous trip to West Africa and they had to discontinue their medication. Which of these recommendation [...]

By | February 24th, 2017|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (87)

A 36 year-old man with a long history of depression visits her physician for persistent lower back pain. He takes amitriptyline once a day. His physician prescribes an opioid for his pain. Which one of these opioids may predispose to prolonged QRS? A-Fentanyl B-Hydrocodone C-Meperidine D-Morphine E-Propoxyphene Answer: Propoxyphene is the only one of the [...]

By | February 20th, 2017|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (86)

A 12-year old student develops allergic reaction on her ears after wearing new earrings. Her mother is concerned because she always have the same reaction when she wears any jewelry. This allergic reaction is considered which type of hypersensitivity? A- Type 1 B- Type ll C- Type lll D- Type lV Answer: This is most [...]

By | January 3rd, 2017|USMLE Step 1|2 Comments

Repeated USMLE Questions Step 1 (85)

A 65-year-old man presents with gradual low back pain increasing in intensity for the last six months. X-ray shows several osteoblastic lesions on lower vertebra and pelvic bones. Additional investigations reveal that those lesions are metastases. Which of these is most likely the primary cancer in this patient? A-Chronic lymphocytic leukemia B-Hodgkin’s lymphoma C-Prostatic cancer [...]

By | January 3rd, 2017|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (84)

A 21 year-old man is admitted for bacterial meningitis. The patient has severe headache and blurred vision. His housemates report that he had gait disturbance and repeated falls on his way to the hospital. CT scan of the head reveals enlarged ventricles. What is the mechanism of enlarged ventricle in this patient? A- Increased production [...]

By | December 31st, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (83)

A 1-year-old boy is brought to the physician by his parents due to repeated upper respiratory tract infections and oral fungal infections. Physical examination reveals low set ears and fish-like mouth. Laboratory tests reveal hypocalcemia and chest x-ray shows no thymus shadow. What is the most likely cause of hypocalcemia in this case? A- Decreased [...]

By | December 18th, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (82)

A 24-year-old man with a history of Aids is currently managed by antiretroviral therapy  (HAART) containing a protease-inhibitor, a nucleoside reverse transcriptase inhibitor and a non-nucleoside reverse transcriptase inhibitor. Which one of these drugs is a non-nucleoside reverse transcriptase inhibitor? A- Etravirine B- Indinavir C- Lamivudine D- Saquinavir E- Zidovudine Answer: Etravirine is the only [...]

By | December 16th, 2016|USMLE Step 1|0 Comments

Repeated USMLE Questions Step 1 (81)

A 14-year-old boy complains of difficulty walking and pain over his left leg. He plays with the basketball school team and he regularly does strenuous exercise.  Examination reveals sensory loss between the first and second toes. What is the most likely affected nerve related to this condition? A- Superficial peroneal nerve B- Deep peroneal [...]

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