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Reverse remodelling of systolic left ventricular contraction pattern by long term cardiac resynchronisation therapy:
P Schuster1, S Faerestrand, O J Ohm
1Department of Heart Disease, Haukeland University Hospital, Institute of Medicine, University of Bergen, N-5021 Bergen, Norway. peter.schuster@med.uib.no
Heart (British Cardiac Society)
|November 18, 2004
Summary
Cardiac resynchronisation therapy (CRT) significantly improves heart failure (HF) outcomes by resynchronizing left ventricular (LV) movement. Long-term CRT enhances ejection fraction and reduces LV dimensions, improving overall cardiac function.
Area of Science:
- Cardiology
- Biomedical Engineering
Background:
- Heart failure (HF) is a complex condition often characterized by impaired left ventricular (LV) function and dyssynchronous contraction.
- Cardiac resynchronisation therapy (CRT) using biventricular pacing aims to improve cardiac mechanics in HF patients with conduction delays.
Purpose of the Study:
- To quantify the long-term effects of CRT on regional LV contraction patterns and hemodynamic function in HF patients.
- To assess the degree of mechanical resynchronization achieved by CRT over an extended follow-up period.
Main Methods:
- Utilized colour Doppler tissue velocity imaging (c-TVI) to examine regional changes in LV contraction patterns in 19 HF patients with bundle branch block.
- Compared time differences in systolic tissue velocity peaks (SYS) between interventricular septum and LV free wall segments at basal and mid LV sites.
Main Results:
- Long-term CRT (mean 9.8 months) significantly increased ejection fraction (21.8% to 30.8%) and reduced LV end-diastolic and end-systolic diameters.
- Baseline dyssynchrony, with LV free wall contraction delayed by up to 29 ms, was significantly reduced after CRT, indicating improved regional coordination.
Conclusions:
- Improved hemodynamic function during CRT is attributed to significant resynchronization of regional LV movement patterns.
- CRT demonstrates long-term efficacy in improving cardiac mechanics and function in selected HF patients.