CLINICAL STUDY: DIAGNOSTICS AND HEART FAILURE
Tissue doppler imaging predicts improved systolic performance and reversed left ventricular remodeling during long-term cardiac resynchronization therapy
Peter Søgaard, MD, DMSc*,*,
Henrik Egeblad, MD, DMSc, FESC*,
W. Yong Kim, MD, PhD*,
Henrik K. Jensen, MD, PhD*,
Anders K. Pedersen, MD, DMSc*,
Bent Ø. Kristensen, MD, DMSc* and
Peter T. Mortensen, MD*
* Department of Cardiology, Aarhus University Hospital, Aarhus, Denmark
Manuscript received September 11, 2001;
revised manuscript received April 17, 2002,
accepted May 20, 2002.
* Reprint requests and correspondence: Dr. Peter Søgaard, Department of Cardiology, Aarhus University Hospital, DK-8200 Aarhus North, Denmark. psogaard{at}dadlnet.dk
OBJECTIVES: We sought to evaluate the long-term impact of cardiac resynchronization therapy (CRT) on left ventricular (LV) performance and remodeling using three-dimensional echocardiography and tissue Doppler imaging (TDI).
BACKGROUND: Three-dimensional echocardiography and TDI allow rapid and accurate evaluation of LV volumes and performance.
METHODS: Twenty-five consecutive patients with severe heart failure and bundle branch block who underwent biventricular pacemaker implantation were included. Before and after implantation of the pacemaker, three-dimensional echocardiography and TDI were performed. These examinations were repeated at outpatient visits every six months.
RESULTS: Five patients (20%) died during one-year follow-up. In the remaining 20 patients, significant reductions in LV end-diastolic volume and LV end-systolic volume of 9.6 ± 14% and 16.5 ± 15%, respectively (p < 0.01), could be demonstrated during long-term follow-up. Accordingly, LV ejection fraction increased by 21.7 ± 18% (p < 0.01). According to a newly developed TDI techniquetissue trackingall regional myocardial segments improved their longitudinal systolic shortening (p < 0.01). The extent of the LV base displaying delayed longitudinal contraction, as detected by TDI before pacemaker implantation, predicted long-term efficacy of CRT. The QRS duration failed to predict resynchronization efficacy.
CONCLUSIONS: Cardiac resynchronization significantly improved LV function and reversed LV remodeling during long-term follow-up. Patients likely to benefit from CRT can be identified by TDI before implantation of a biventricular pacemaker.
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Abbreviations and Acronyms
| | CRT | | cardiac resynchronization therapy | | DLC | | delayed longitudinal contraction | | GSCA | | global systolic contraction amplitude | | LV | | left ventricle/ventricular | | LVEF | | left ventricular ejection fraction | | NYHA | | New York Heart Association | | RV | | right ventricle/ventricular | | SR | | strain rate | | TDI | | tissue Doppler imaging | | TT | | tissue tracking |
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