USMLE Step 1

USMLE Step 1 QUESTION of the DAY!

A 64 year-old man has severe swelling of his lower extremities and difficulty breathing. On physical exam, breath sounds are absent at the base of both lungs.
All of the following are causes of Left-sided congestive heart failure except:

A) Cor pulmonale
B) Systemic Hypertension
C) Myocarditis
D) Cardiomyopathy
E) Congenital heart disease


(scroll for answer)




















Answer: A) Cor pulmonale is an etiology of Right-sided CHF. Systemic HTN, myocarditis, cardiomyopathy can be causes of both Right and Left-sided CHF. Congenital heart disease is not an etiology of Right-Sided CHF, only Left-sided.


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

Drug of choice for

Mycoplasma pneumoniae causing atypical pneumonia

(scroll for answer)

























Erythromycin



FACT of the DAY!

Drug Profile: Tetracycline
Mechanism- bacteriostatic, reversibly bind to the 30s ribosomal subunit preventing the addition of new amino acids onto growing peptide chain
Effective against- gram (+) and gram (-), anaerobes, spirochetes, mycoplasma, rickettsiae, chlamydiae, and some protozoa
ADR’s- teeth discoloration, depression of skeletal growth, GI distress, hepatotoxicity, photosensitivity; contraindicated in pregnancy and children due to effects on teeth and bones