Characteristics of responders to cardiac resynchronization therapy: the impact of echocardiographic left ventricular volume.

Abstract:

BACKGROUND:One-third of patients who receive cardiac resynchronization therapy (CRT) are classified as nonresponders. Characteristics of responders to CRT have been studied in multiple clinical trials. HYPOTHESIS:Independent predictors of CRT response may be identified by studying a series of patients in routine clinical practice. METHOD:One hundred twenty-five patients were examined retrospectively from a multidisciplinary CRT clinic program. Echocardiographic CRT response was defined as a decrease in left ventricular (LV) end-systolic volume of ≥15% and/or absolute increase of 5% in LV ejection fraction at the 6-month visit. RESULTS:There were 81 responders and 44 nonresponders. By univariate analyses, female sex, nonischemic cardiomyopathy etiology, baseline QRS duration, the presence of left bundle branch block (LBBB), and left ventricular end-diastolic volume (LVEDV) index predicted CRT response. However, multivariate analysis demonstrated that only QRS duration, LBBB, and LVEDV index were independent predictors (QRS width, odds ratio [OR]: 1.027, 95% confidence interval [CI]: 1.004-1.050, P = 0.023; LBBB, OR: 3.568, 95% CI: 1.284-9.910, P = 0.015; LVEDV index, OR: 0.970, 95% CI: 0.953-0.987, P = 0.001). Although female sex and nonischemic etiology were associated with an improved CRT response on univariate analyses, after adjusting for LV volumes they were not independent predictors. CONCLUSIONS:QRS width, LBBB, and LVEDV index are independent predictors for echocardiographic CRT response. Previously reported differences in CRT response for sex and cardiomyopathy etiology are associated with differences in baseline LV volumes in our clinical practice.

journal_name

Clin Cardiol

journal_title

Clinical cardiology

authors

Park MY,Altman RK,Orencole M,Kumar P,Parks KA,Heist KE,Singh JP,Picard MH

doi

10.1002/clc.22043

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

777-80

issue

12

eissn

0160-9289

issn

1932-8737

journal_volume

35

pub_type

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