🐸 The "Frog Sign" in AVNRT: A Key Physical Finding A hallmark of AVNRT is prominent neck pulsations ("frog sign") due to simultaneous atrial and ventricular contraction against a closed tricuspid valve, resulting in retrograde cannon A-waves in the jugular veins. Mechanism & Implication: · Pathognomonic of typical AVNRT (slow-fast), due to 1:1 retrograde atrial activation. · High Specificity: Strongly suggests a supraventricular tachycardia (SVT) utilizing the AV node. Clinical Relevance: A rap
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🐸 The "Frog Sign" in AVNRT: A Key Physical Finding A hallmark of AVNRT is prominent neck pulsations ("frog sign") due to simultaneous atrial and ventricular contraction against a closed tricuspid valve, resulting in retrograde cannon A-waves in the jugular veins. Mechanism & Implication: · Pathognomonic of typical AVNRT (slow-fast), due to 1:1 retrograde atrial activation. · High Specificity: Strongly suggests a supraventricular tachycardia (SVT) utilizing the AV node. Clinical Relevance: A rap
31.1K views5 months ago
FacebookAbdallah Othman
Understanding the Frog Sign in Diagnosing AVNRT: What You Need to Know
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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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🐸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
23K viewsDec 1, 2024
FacebookAbdallah Othman
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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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