Key takeaway: After measles exposure, give MMR within 72 hours to eligible patients—even if they’ve already had 1 dose—while reserving immune globulin for high-risk groups. 

Synovial fluid aspiration for Gram stain and culture is the highest-yield diagnostic step in suspected septic arthritis, and crystals or lack of fever do not rule it out. 

In pediatric organophosphate poisoning, atropine treats muscarinic symptoms, but pralidoxime is added to reverse acetylcholinesterase inhibition (especially when respiratory compromise/weakness is present). <...

A loud/accenuated P2 plus a tricuspid regurgitation holosystolic murmur strongly suggests clinically significant pulmonary hypertension with right-sided strain.