Anatomical Differential Diagnosis for Arrhythmias

 • SA node: Sinus bradycardia, Sick Sinus Syndrome (SSS)

 • AV node: Junctional escape rhythm, Conduction blocks (1°, 3° and Type 1 2°)

 • His-purkinje system: Conduction blocks (1°, 3°, and Type II 2°)

 • Ventricles: Ventricular Escape Rhythm (i.e. idioventricular rhythm)

Tachy-arrhythmias (ventricular rate > 100 bpm)

 • SA node: Sinus tachycardia

 • Atria: Premature Atrial Contractions (PACs), Atrial Flutter (AFL), Atrial Fibrillation (AF), Paroxysmal supraventricular tachycardias (PST), Focal Atrial Tachycardia (FAT), Multifocal Atrial Tachycardia (MAT)

 • AV node: AV re-entrant tachycardia (AVRT), AV nodal re-entrant tachycardia (AVNRT)

 • Ventricles: Premature Ventricular Contractions (PVC), Ventricular tachycardia (V-tach, VT), Monomorphic VT, Polymorphic VT (i.e. Torsades de Pointes), Ventricular Fibrillation (V-Fib, VF)



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