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Narrow Complex Tachycardias (Simplified)

Irregular Narrow Complex Tachycardia:
 1. Atrial fibrillation
	- Usually the correct answer
 2. Multifocal
Narrow Complex Tachycardias ... Sinus tachycardia ... retrograde) - AVNRT ... , AVRT, Junctional ... differential #diagnosis #causes
Supraventricular Tachycardias - Pathophysiology
Conduction pathways through SA Node, Atrium, AV Node, Bundle of His, and Ventricle
Supraventricular Tachycardias ... • Atrial Tachycardia ... Nodal Reentry Tachycardia ... • AV Reentry Tachycardia ... conduction #pathways #avnrt
Tachycardia - Differential Diagnosis Framework
Narrow-Complex:
 • Regular: Sinus Tachycardia, Junctional Tachycardia, Atrial Tachycardia, Atrial Flutter, AVRT
Tachycardia - Differential ... , Atrial Tachycardia ... Atrial Flutter, AVRT ... WPW), AVnRT (ie ... , Antidromic AVRT
Anatomical Differential Diagnosis for Arrhythmias
 • SA node: Sinus bradycardia, Sick Sinus Syndrome (SSS)
 • AV
SA node: Sinus tachycardia ... (AVRT), AV nodal ... re-entrant tachycardia ... (AVNRT) • Ventricles ... Differential #Diagnosis #Causes
Lead AVR on ECG
1. Acute myocardial infarction: ST elevation > 1.5 mm in aVR, indicative of
Lead AVR on ECG ... aVR • Classic EKG ... (AVRT) in WPW: ... ddx: AVNRT, AVRT ... electrocardiogram #diagnosis #ekg
Tachyarrhythmia Framework - Differential Diagnosis
 • Narrow QRS - Regular Rhythm: Sinus tachycardia, AVNRT, Orthodromic AVRT,
Rhythm: Sinus tachycardia ... , AVNRT, Orthodromic ... AVRT, Atrial Tachycardia ... flutter, Junctional tachycardia ... block, Antidromic AVRT
Treatment of Stable Narrow-Complex Tachycardia
Regular Rhythm:
 • Attempt vagal maneuvers
 • Give adenosine 6 milligrams IV
Converts - Probably AVnRT ... Control rate (e.g ... Treat underlying cause ... Control rate (e.g ... Treat underlying cause
Lead aVR on EKG
Lead aVR can provide some unique insight into 5 different conditions:

 - Acute
Lead aVR on EKG ... TCA-like overdose - AVRT ... narrow complex tachycardias ... in wide complex tachycardias ... Diagnosis #Cardiology #EKG
Supraventricular Tachycardia EKG

Here’s a great ECG case of a 50-year-old lady who presented with palpitations

Her heart
Supraventricular Tachycardia ... great ECG case of ... @EM_RESUS #AVRT ... Supraventricular #Tachycardia ... #Cardiology #EKG
Supraventricular Tachycardia (SVT) - Differential Diagnosis Framework and Management

Regular SVT: Sinus Tachycardia, AVNRT, AVRT, Atrial Flutter,
Supraventricular Tachycardia ... Regular SVT: Sinus Tachycardia ... , AVNRT, AVRT, Atrial ... Ectopic Atrial Tachycardia ... Supraventricular #Tachycardia