Atrioventricular Nodal Reentrant Tachycardia (AVNRT): Mechanism & Management 🔹 Primary Mechanism & Ablation Target AVNRT is a macro-reentrant supraventricular tachycardia dependent on dual atrioventricular (AV) nodal physiology. The typical (slow-fast) circuit uses the slow pathway for antegrade conduction and the fast pathway for retrograde conduction. Catheter ablation targeting the slow pathway is the definitive therapy. The standard anatomical target is the right inferior nodal extension wi
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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
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