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Benefits of Cardiac Resynchronization Therapy for Heart Failure Patients With Narrow QRS Complexes and Coexisting Systolic Asynchrony by Echocardiography

Open access
Yu, Cheuk-Man, Chan, Yat-Sun, Zhang, Qing, Yip, Gabriel W.K., Chan, Chi-Kin, Kum, Leo C.C., Wu, LiWen, Lee, Alex Pui-Wai, Lam, Yat-Yin, Fung, Jeffrey Wing-Hong·2006·Journal of the American College of Cardiology

Abstract

OBJECTIVES This study was designed to evaluate the role of cardiac resynchronization therapy (CRT) in heart failure (HF) patients with narrow QRS complexes (<120 ms) and echocardiographic evidence of mechanical asynchrony. BACKGROUND Cardiac resynchronization therapy is currently recommended to advanced HF patients with prolonged QRS duration. Echocardiographic assessment of systolic mechanical asynchrony has been proven useful to predict a favorable response after CRT. METHODS A total of 102 HF patients with New York Heart Association (NYHA) functional class III or IV were enrolled. Among them, 51 had wide QRS (>120 ms) and 51 had narrow QRS (<120 ms). Tissue Doppler imaging (TDI) was employed to select patients with systolic asynchrony (increased asynchrony index) in the narrow-QRS group. Clinical and echocardiographic assessments were performed at baseline and 3 months after CRT. RESULTS There was a significant reduction of left ventricular (LV) end-systolic volume in both narrow (122 +/- 42 cc vs. 103 +/- 47 cc, p < 0.001) and wide (148 +/- 74 cc vs. 112 +/- 64 cc, p < 0.001) QRS groups. Improvement of NYHA functional class (both p < 0.001), maximal exercise capacity (both p < 0.05), 6-min hall-walk distance (both p < 0.01), ejection fraction (both p < 0.001), and mitral regurgitation (both p < 0.005) was also observed. In both groups, the degree of baseline mechanical asynchrony determined LV reverse remodeling to a similar extent, as shown by the superimposed regression lines. Withholding CRT for 4 weeks resulted in loss of echocardiographic benefits. CONCLUSIONS Cardiac resynchronization therapy for HF patients with narrow QRS complexes and coexisting mechanical asynchrony by TDI results in LV reverse remodeling and improvement of clinical status. The amplitude of benefit is similar to the wide-QRS group provided that similar extent of systolic asynchrony is selected.

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Metadata

Authors
Yu, C.-M., Chan, Y.-S., Zhang, Q., Yip, G. W. K., Chan, C.-K., Kum, L. C. C., Wu, L., Lee, A. P.-W., Lam, Y.-Y., & Fung, J. W.-H.
Venue
Journal of the American College of Cardiology
Publisher
Elsevier BV
Published
2006-12
Volume
48
Issue
11
Pages
2251-2257
ISSN
0735-1097 (ISSN-L)
OpenAlex
W2016088603
Cited by
273
References
19
FWCI
20.34
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Benefits of Cardiac Resynchronization Therapy for Heart Failure Patients With Narrow QRS Complexes and Coexisting Systolic Asynchrony by Echocardiography. https://app.cochat.ai/papers/10.1016/j.jacc.2006.07.054
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Yu, C.-M., Chan, Y.-S., Zhang, Q., Yip, G. W. K., Chan, C.-K., Kum, L. C. C., Wu, L., Lee, A. P.-W., Lam, Y.-Y., & Fung, J. W.-H. (2006). Benefits of Cardiac Resynchronization Therapy for Heart Failure Patients With Narrow QRS Complexes and Coexisting Systolic Asynchrony by Echocardiography. Journal of the American College of Cardiology. https://doi.org/10.1016/j.jacc.2006.07.054

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