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Supraventricular Tachycardias - Pathophysiology
Conduction pathways through SA Node, Atrium, AV Node, Bundle of His, and Ventricle
Supraventricular Tachycardias ... Node, Atrium, AV ... Fibrillation • AV ... • AV Reentry ... Tachycardia #
Anatomical Differential Diagnosis for Arrhythmias
 • SA node: Sinus bradycardia, Sick Sinus Syndrome (SSS)
 • AV
SA node: Sinus tachycardia ... , Focal Atrial Tachycardia ... tachycardia (AVRT ... tachycardia (AVNRT ... ), Ventricular tachycardia
Limb Lead Reversal
In order to understand why the leads look the way they do, we must
As for the aVL/aVF ... remember that aVL ... /aVF/aVR are all ... Einthovens #Triangle #aVL ... #aVR #aVF
Narrow Complex Tachycardias (Simplified)

Irregular Narrow Complex Tachycardia:
 1. Atrial fibrillation
	- Usually the correct answer
 2. Multifocal
Narrow Complex Tachycardias ... Narrow Complex Tachycardia ... Multifocal Atrial Tachycardia ... Narrow Complex Tachycardia ... Sinus tachycardia
Lead AVR on ECG
1. Acute myocardial infarction: ST elevation > 1.5 mm in aVR, indicative of
findings: Sinus tachycardia ... narrow cornplex tachycardia ... Narrow complex tachycardia ... , AVRT, atrial tachycardia ... wide cornplex tachycardia
Tachycardia - Differential Diagnosis Table - Wide vs Narrow, Regular vs Irregular

Regular Rhythm - Narrow Complex
Tachycardia - Differential ... Narrow Complex Tachycardia ... Determine whether AF ... • HyperK vs AF ... abnormality • Beware AV
Algorithm for the Evaluation of Regular, Wide-Complex Tachycardia
1. aVR: Is the initial deflection in aVR positive?
, Wide-Complex Tachycardia ... 1. aVR: Is the ... deflection in aVR ... AV Dissociation: ... #WideComplex #Tachycardia
Treatment of Stable Wide-Complex Tachycardia
Regular
 • If ventricular tachycardia or uncertain rhythm:
    -
Stable Wide-Complex Tachycardia ... If ventricular tachycardia ... (AF + WPW) ... polymorphic ventricular tachycardia ... #WideComplex #Tachycardia
Causes of Tachycardia - Differential Diagnosis Algorithm
Narrow Complex - Regular:
 • Sinus tachycardia
 • Atrial flutter
Causes of Tachycardia ... Atrial flutter • AV ... • AV reentrant ... tachycardia • ... Atrial tachycardia
Ventricular Tachycardia in Wide Complex Tachycardia - Telemetry Diagnosis
 • Lead V1 - LBBB Criteria
 •
Ventricular Tachycardia ... in Wide Complex Tachycardia ... RWPT) • Lead aVR ... #Ventricular #Tachycardia