Relative Wall Thickness and the Risk for Ventricular Tachyarrhythmias in Patients With Left Ventricular Dysfunction.

Abstract

BACKGROUND:

Relative wall thickness (RWT), defined as 2 times posterior wall thickness divided by the left ventricular (LV) diastolic diameter, is a measure of LV geometry and may be a marker for adverse events in patients with LV dysfunction.

OBJECTIVES:

The aim of this study was to investigate the relationship between RWT and the risk for ventricular tachyarrhythmia (VA) in patients enrolled in the MADIT-CRT (Multicenter Automatic Defibrillator Implantation Trial With Cardiac Resynchronization Therapy) study.

METHODS:

The study population comprised 1,260 patients with mild heart failure and left bundle branch block.

RESULTS:

In a multivariable model, RWT was the most powerful echocardiographic measure for estimating the risk of VAs compared with commonly used echocardiographic variables. Patients with low RWT (<0.24) had 83% (p < 0.001) increased risk for VA and 68% (p < 0.001) increase in VA risk or death (VA/death) compared with patients with higher RWT values. Each 0.01-unit decrease in RWT was associated with 12% (p < 0.001) and 10% (p < 0.001) increases in the risk of VA and VA/death, respectively. Treatment with cardiac resynchronization therapy with defibrillator (CRT-D; CRT with implantable cardioverter-defibrillator) was associated with a greater increase in RWT compared with implantable cardioverter-defibrillator at 12 months (4.6 ± 6.8% vs. 1.5 ± 2.7%; p < 0.001), and every 10% increase in RWT in CRT-D patients was associated with 34% (p = 0.027) and 36% (p = 0.009) reductions in the risk of subsequent VA and VA/death, respectively.

CONCLUSIONS:

In patients with mild heart failure and left bundle branch block, decreased RWT was associated with an increase in the risk of VA and VA/death. CRT-D therapy was associated with a favorable increase in RWT and reduction in risk of VA and VA/death. (Multicenter Automatic Defibrillator Implantation Trial With Cardiac Resynchronization Therapy [MADIT-CRT]; NCT00180271).

• Authors: Yitschak Biton, Ilan Goldenberg, Valentina Kutyifa, Jayson R Baman, Scott Solomon, Arthur J Moss, Barbara Szepietowska, Scott McNitt, Bronislava Polonsky, Wojciech Zareba, Alon Barsheshet
• Journal: Journal of the American College of Cardiology (J Am Coll Cardiol) Vol. 67 Issue 3 Pg. 303-12 (Jan 26 2016) ISSN: 1558-3597 [Electronic] United States
• PMID: 26796396 (Publication Type: Journal Article, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2016 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.

Topics

• Aged
• Bundle-Branch Block (complications)
• Cardiac Resynchronization Therapy (adverse effects, methods)
• Defibrillators, Implantable (adverse effects)
• Echocardiography (methods)
• Female
• Heart Failure (complications, diagnosis, therapy)
• Heart Ventricles (pathology)
• Humans
• Male
• Middle Aged
• Organ Size
• Outcome Assessment, Health Care
• Risk Assessment (methods)
• Risk Factors
• Statistics as Topic
• Tachycardia, Ventricular (epidemiology, etiology, prevention & control)
• Ventricular Dysfunction, Left (diagnosis, etiology, physiopathology)