Preexcitation

ECG STAT January 1, 2026

Wolff-Parkinson White (WPW) Syndrome

Key Points Pattern vs syndrome: WPW pattern = pre-excitation on ECG without symptoms. WPW syndrome = pattern plus tachyarrhythmia symptoms (palpitations, syncope, “seizure,” aborted sudden cardiac arrest). Mechanism: Congenital accessory…

ECG STAT January 1, 2026

WPW Syndrome and Pseudo-MI Patterns

Key Points: WPW alters ventricular depolarization, producing secondary repolarization abnormalities that can mimic or mask myocardial infarction. ST-segment deviation in WPW is often non-ischemic, driven by abnormal activation via the…

ECG STAT September 14, 2025

Atrioventricular Reciprocating Tachycardia (AVRT)

Key Points AVRT is a macroreentrant SVT that uses both the AV node and an accessory pathway. Orthodromic AVRT conducts down the AV node and up the pathway and is…

ECG STAT September 1, 2025

Preexcitation Syndromes

Key Points Terminology: WPW pattern = ECG evidence of pre-excitation without symptoms. WPW syndrome = pattern plus symptomatic tachyarrhythmia (e.g., AVRT, pre-excited AF). Mechanism: An atrioventricular accessory pathway (e.g., Kent;…

ECG STAT September 1, 2025

Delta Waves: Basics

Key Points: Definition: A delta wave is the slurred upstroke at the start of the QRS, produced by early ventricular activation through an accessory pathway that bypasses the AV node….

ECG STAT July 11, 2025

Atrial Flutter 1:1 Conduction

Key Points Rare, dangerous presentation. When atrial flutter conducts 1:1 through the AV node (or an accessory pathway), the ventricular rate can approach the atrial rate ~240–320 bpm, producing rapid…

ECG STAT February 13, 2025

Atrial Fibrillation with WPW

Key Points: WPW Syndrome: A condition characterized by ventricular pre-excitation due to a congenital accessory pathway, often associated with symptomatic arrhythmias. ECG Recognition: The WPW pattern is best identified when…

ECG STAT October 9, 2024

WPW with Antidromic SVT

Key Points WPW Syndrome: Wolff-Parkinson-White (WPW) syndrome is a condition characterized by ventricular pre-excitation due to a congenital accessory pathway in patients with symptomatic arrhythmias. ECG Recognition: The classic WPW…

ECG STAT October 9, 2024

WPW with Orthodromic SVT

Key Points WPW syndrome is caused by congenital ventricular pre-excitation via an accessory pathway. The classic sinus rhythm pattern includes a short PR interval, delta wave, and a widened QRS,…

Weekly Workout April 29, 2024

Post cardioversion ECG of SVT in patient with palpitations and near syncope

A 29-year-old woman presents to the emergency department with an episode of palpitations and near syncope. She reports several similar episodes in the past that were brief in duration and…

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