USMLE Step 1

USMLE Step 1 QUESTION of the DAY!

Mr. Ryan was mowing his lawn on a hot August day when he began to experience chest pain. After sitting down the pain went away. He said he has never experienced anything like that before. Mr. Ryan most likely experienced:

A) Acute myocardial infarction
B) Unstable Angina
C) Stable Angina
D) Prinzmetal’s angina
E) GERD

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Answer: C) Stable Angina. It is the most common form of angina pectoris. Typical presentation is it begins during strenuous activity and it is relieved by rest. Stable angina results from chronic stenosis of the coronary arteries.


USMLE Step 1 D.O.C. of the DAY!

Drug of choice for

Staphylococcus aureus causing sepsis, osteomyelitis

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Oxacillin or Nafcillin



FACT of the DAY!

HIV
-causative agent of AIDS
-HIV 1: most common type found everywhere
-HIV 2: found in West Africa, less virulent, possible false negative on ELISA test.
-genome is two identical strands of RNA with 3 major genes:
Env: gp41-mediates cell fusion and gp120-binds to CD4 receptors
Gag: core capsid protein- P24 seriologic marker
Pol: reverse transcriptase, integrase, protease
-TESTS: ELISA- good sensitivity, good specificity, used for screening
Western blot- extremely specific, confirms positive ELISA