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