Repeated USMLE Questions Step 1- Review- 50

Q- A 64-year-old male presents to the ER with sudden left-sided paralysis. The patient had a history of a compound fractured femur 2 months ago. His medical history includes myocardial infarction and atrial fibrillation. Which one of the following is most likely responsible for this patient’s condition?

A-Fat embolism

B-Thromboembolism from the left atrium

C-Thromboembolism from the right ventricle

D-Venous thromboembolism from the deep leg veins

B-Thromboembolism from the left atrium- Fat embolism usually occurs 1-3 days following severe compound fractures. Thromboembolism from the right side of the heart and venous system travel to the lung and can’t get past it to the brain. Emboli to the brain and other organs come from embolism from left atrium, a complication of atrial fibrillation.

Q- Common myeloid progenitor will give rise to which one of the following types of cells?

A-B lymphocytes


C-Natural killer (NK) cells

D-T lymphocytes

B-Eosinophils- It is the only type of cells of the answer options generated from common myeloid progenitor. Other types of cells on the list are generated from common lymphoid progenitor.

Q- Which one of the following conditions is a polyarticular rheumatoid arthritis which is characterized by splenomegaly, leucopenia and leg ulcers?

A-Ankylosing spondylitis

B-Felty syndrome

C-Psoriatic arthritis

D-Still disease

B-Felty syndrome- Neutropenia in Felty syndrome causes splenomegaly and bone marrow failure. Still disease is a juvenile rheumatoid arthritis and accompanied with fever, lymphadenopathy and periarticular swelling.

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