Stridor
From FOAM EMed Index
Some good films here - focused on pediatrics http://dontforgetthebubbles.com/stridor-drooling/
Specifically about croup http://lifeinthefastlane.com/ccc/croup/
This post focuses on adults and medications and therapies http://www.pharmacyjoe.com/pharmacotherapy-for-stridor-in-adult-icu-patients/