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A novel electrocardiographic criterion for differentiating a left from right ventricular outflow tract tachycardia

Naoki Yoshida1, Takumi Yamada, H Thomas McElderry

  • 1Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, Alabama, USA.

Journal of Cardiovascular Electrophysiology
|March 12, 2014
PubMed

Insights

A new electrocardiogram (ECG) index, V2S/V3R, accurately differentiates left from right ventricular outflow tract origins of idiopathic ventricular arrhythmias (VA). This novel index offers superior diagnostic performance compared to existing criteria for identifying VA origins.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Idiopathic ventricular arrhythmias (VA) from the outflow tract (OT-VA) can originate from either the left or right ventricles.
  • Existing electrocardiogram (ECG) criteria for differentiating these origins have limited accuracy and clinical utility.

Purpose of the Study:

  • To develop and validate a novel, more accurate ECG criterion for distinguishing between left and right ventricular outflow tract origins of idiopathic VA.
  • To improve the diagnostic capability of surface ECG in localizing the origin of OT-VAs.

Main Methods:

  • The study analyzed ECGs from 207 patients with OT-VAs undergoing catheter ablation, categorizing origins into right ventricular outflow tract (RVOT) and left ventricular outflow tract (LVOT).
  • A new index, V2S/V3R (S-wave amplitude in lead V2 divided by R-wave amplitude in lead V3), was calculated during VA beats.
  • Receiver operating characteristic (ROC) analysis was used to determine the diagnostic performance of the V2S/V3R index.

Main Results:

  • The V2S/V3R index was significantly lower in patients with LVOT origins compared to RVOT origins (P < 0.001).
  • The V2S/V3R index demonstrated high diagnostic accuracy (Area Under the Curve = 0.964), with a cutoff ≤1.5 predicting LVOT origin with 89% sensitivity and 94% specificity.
  • The V2S/V3R index outperformed all previously reported ECG criteria in differentiating left from right OT-VA origins.

Conclusions:

  • The V2S/V3R index is a highly accurate and superior ECG criterion for differentiating the origin of idiopathic ventricular arrhythmias from the left versus right ventricular outflow tracts.
  • This index provides improved diagnostic value independent of the precordial transition site, enhancing its clinical applicability.
Abstract

Keywords:
catheter ablationelectrocardiogrampremature ventricular contractionventricular outflow tractventricular tachycardia

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