The "frog sign" is nothing more than the cannon-type "a" waves produced by the nearly simultaneous contractions of the atria and ventricles while the mitral and tricuspid valves are closed in the setting of a rapid tachyarrhythmia. This causes an abrupt increase in right atrial pressure that is transmitted in reversal of flow in the superior vena cava resulting in jugular venous pulsations. | Cardiophilia
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🐸The frog sign in AVNRT (Atrioventricular Nodal Reentrant Tachycardia) refers to prominent neck pulsations caused by simultaneous contraction of the atria and ventricles. Since the tricuspid valve is closed during these contractions, blood gets pushed back into the veins, making the neck veins visibly pulsate like a frog's throat. It's a hallmark physical finding in AVNRT and indicates the heart is beating very fast due to an abnormal electrical circuit in the AV node. This sign is often seen d
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