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Distinct left bundle branch block pattern in ischemic and non-ischemic dilated cardiomyopathy

Antoni Bayes-Genis1, Laura Lopez, Xavier Viñolas

  • 1Servei de Cardiologia, Hospital de la Santa Creu i Sant Pau, C/ San Antonio Ma Claret 167, 08025, Barcelona, Spain. abayesgenis@hsp.santpau.es

European Journal of Heart Failure
|March 20, 2003
PubMed

Insights

Electrocardiogram (ECG) voltage in lead V3 can help differentiate dilated cardiomyopathy causes. This finding aids in distinguishing between ischemic and non-ischemic origins in patients with left bundle branch block (LBBB).

Area of Science:

  • Cardiology
  • Medical Diagnostics

Background:

  • Dilated cardiomyopathy (DCM) frequently presents with advanced left bundle branch block (LBBB) on electrocardiograms (ECG).
  • Differentiating the etiology of DCM, specifically ischemic (IC) versus non-ischemic (NIC), is crucial for appropriate patient management.

Purpose of the Study:

  • To investigate if specific patterns of LBBB on surface ECG can distinguish between ischemic and non-ischemic dilated cardiomyopathy.
  • To identify novel ECG criteria for differentiating DCM etiologies in the presence of LBBB.

Main Methods:

  • Analysis of ECGs from 41 patients with DCM and LBBB, categorized into NIC (n=26) and IC (n=15) groups.
  • Digital measurement of ECG duration and voltage, focusing on precordial leads (V1-V3).
  • Receiver operating characteristic (ROC) analysis to determine the discriminative power of ECG parameters.

Main Results:

  • No significant difference in S wave notching in leads V1-V3 between NIC and IC groups.
  • Significantly higher voltages in precordial leads V2, V3, and their sum (Sigma V1-V3) were observed in the NIC group.
  • ECG lead V3 voltage exceeding 2100 microV demonstrated high discriminative power (AUC=0.805), with 85% sensitivity and 73% specificity for identifying NIC.

Conclusions:

  • A single ECG criterion, the voltage of lead V3, is a valuable parameter.
  • This parameter can effectively identify patients with dilated cardiomyopathy of non-ischemic origin when advanced LBBB is present.
Abstract

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