Electrocardiographic left ventricular hypertrophy predicts arrhythmia and mortality in patients with ischemic cardiomyopathy.

Abstract

PURPOSE:

The relatively low incidence of device-treated ventricular arrhythmias in patients with ischemic cardiomyopathy (ICM) who receive implantable cardioverter defibrillators (ICDs) for primary prevention makes improved risk stratification of ICM patients a priority. Although Cornell product (CP) ECG left ventricular hypertrophy (LVH) has been associated with increased mortality in hypertensive patients and population-based studies, whether CP LVH can improve risk stratification of high-risk ICM patients is unclear. The aim of this study is to examine if electrocardiographic LVH predicts mortality and incident ventricular arrhythmia in patients with ICM.

METHODS:

All-cause mortality was examined in 317 patients with ICM and a history of non-sustained ventricular tachycardia (VT) who underwent electrophysiology testing. Incident VT and ventricular fibrillation (VF) were assessed in ICD recipients (n = 186). ECG LVH was defined by CP criteria: [(R (aVL) + S (V3)) + 6 mm in women] × QRS duration >2,440 mm ms.

RESULTS:

During 3 years of follow-up, mortality was 20% (64 of 317) and death or incident VT or VF occurred in 35% of ICD recipients. CP LVH was associated with significantly greater 3-year mortality (28% vs 15%, p = 0.015) and 3-year mortality or incident VT/VF in ICD patients (48% vs 35%, p = 0.011). In Cox multivariate models, CP LVH was an independent predictor of mortality in all patients (hazard ratio (HR) 1.81, 95% confidence interval (CI) 1.11-2.97, p = 0.020) and of the composite endpoint of mortality or incident ventricular arrhythmia in ICD patients (HR 1.82, 95% CI 1.12-3.00, p = 0.016).

CONCLUSIONS:

ECG LVH using CP criteria may enhance risk stratification in high-risk patients with ICM.

• Authors: Seth R Bender, Daniel J Friedman, Steven M Markowitz, Bruce B Lerman, Peter M Okin
• Journal: Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing (J Interv Card Electrophysiol) Vol. 34 Issue 3 Pg. 237-45 (Sep 2012) ISSN: 1572-8595 [Electronic] Netherlands
• PMID: 22354775 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Topics

• Aged
• Arrhythmias, Cardiac (mortality, physiopathology, prevention & control)
• Cardiomyopathies (mortality, physiopathology)
• Defibrillators, Implantable
• Electrocardiography
• Female
• Humans
• Hypertrophy, Left Ventricular (mortality, physiopathology)
• Incidence
• Male
• Myocardial Ischemia (mortality, physiopathology)
• Predictive Value of Tests
• Primary Prevention
• Proportional Hazards Models
• Prospective Studies
• Risk Assessment
• Risk Factors
• Tachycardia, Ventricular (mortality, physiopathology)
• Ventricular Fibrillation (mortality, physiopathology)