Related Experiment Video
Updated: Aug 6, 2026

Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice
Published on: June 29, 2022
A Concealed Typical AVNRT: U Wave Contribution in Simulating Long RP Supraventricular Tachycardia
Gabriela-Elena Marascu1,2, Alexandru Deaconu1,2, Viviana Alexandra Gondos3
1Faculty of Medicine Carol Davila University of Medicine and Pharmacy Bucharest Romania.
Abstract:
Accurate identification of P waves on electrocardiogram (ECG) is essential in supraventricular tachycardias because U waves may resemble retrograde P waves, producing a pseudo-long RP interval and hiding typical atrioventricular nodal reentrant tachycardia (AVNRT). A 40-year-old woman presented with regular narrow-complex tachycardia with a positive deflection immediately following the T wave, creating the impression of a long RP tachycardia. The electrophysiological study revealed a short VA interval with an H-A-V activation sequence, characteristic of typical slow-fast AVNRT. This case emphasizes the diagnostic challenge posed by U waves at higher heart rates, which can obscure the true arrhythmia mechanism.
Related Concept Videos
Dysrhythmias IV: Characteristics of Bradyarrhythmias
Dysrhythmias III: Characteristics of Dysrhythmias
Disturbances in Heart Rhythm
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Conduction System of the Heart
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
Electrophysiology of Normal Cardiac Rhythm

