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(Circulation. 2002;105:1304.)
© 2002 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Cardiomyopathy and Arrhythmia Research and Education Center, University of California, San Francisco, Calif.
Correspondence to Leslie A. Saxon, MD, 500 Parnassus Ave, MU East Box 1354, San Francisco, CA 94143-1354. E-mail saxon{at}medicine.ucsf.edu
Background Long-term ventricular resynchronization therapy improves symptom status. Changes in left ventricular remodeling have not been adequately evaluated.
Methods and Results Fifty-three patients with systolic heart failure and bundle-branch block underwent implantation of biventricular stimulation (BVS) devices as part of a randomized trial. Echocardiograms were acquired at randomization and at 6-week intervals until completion of 12 weeks of continuous BVS. There were no changes in heart rate or QRS duration after 12 weeks of BVS. Serum norepinephrine values did not change with BVS. After 12 weeks of BVS, left atrial volume decreased. Left ventricular end-systolic and end-diastolic dimensions and left ventricular end-systolic volume also decreased after 12 weeks of BVS. Sphericity index did not change. Measures of systolic function, including left ventricular outflow tract and aortic velocity time integral and myocardial performance index, improved.
Conclusions Long-term resynchronization therapy results in atrial and ventricular reverse remodeling and improved hemodynamics.
Key Words: pacing ventricles remodeling
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