Frog sign


Frog sign is seen in case of –


A. Atrial Fibrillation

B. Atrial flutter

C. AVNRT

D. AVRT



What is the mechanism of Frog Sign?


AVNRT – There is AV dissociation

Canon A waves -occur with AV dissociation result from simultaneous contractions of the atria and ventricles against closed mitral and tricuspid valves

Canon A waves – cause reflux of blood into the neck veins.


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