Friday, March 10, 2006


Friday March 10, 2006
Frog Sign

Q: What is Frog sign?

A: In Paroxysmal Supra-Ventricular Tachycardia (PSVT) a rapid and regular bulging seen in the neck. These are actually prominent jugular venous A waves due to atrial contraction against the closed tricuspid valve, and termed as "frog sign".

1. Brief report: the hemodynamic mechanism of pounding in the neck in atrioventricular nodal reentrant tachycardia - N Engl J Med. 1992 Sep 10;327(11):772-4.

2. Evaluation of Patients with Palpitations - NEJM, May, 1998, Volume 338:1369-1373