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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
Published on: December 11, 2017
CRT in Patients with Heart Failure: Time Course of Perfusion and Wall Motion Changes
Alessia Gimelli1, Paolo Frumento, Guido Valle
1Gabriele Monasterio Foundation, CNR, 56124 Pisa, Italy.
Insights
Cardiac Resynchronization Therapy (CRT) significantly improves heart function and perfusion within two months. Key predictors of survival include end-diastolic volume, perfusion defects, and diabetes mellitus.
Area of Science:
- Cardiology
- Medical Imaging
- Heart Failure Management
Background:
- Limited data existed on the relationship between regional wall motion, perfusion, and left ventricular reverse remodeling following Cardiac Resynchronization Therapy (CRT).
- Understanding these dynamics is crucial for optimizing heart failure treatment.
Purpose of the Study:
- To investigate the short- and medium-term effects of CRT on regional myocardial perfusion, wall motion, and left ventricular remodeling.
- To identify predictors of survival in heart failure patients undergoing CRT.
Main Methods:
- Utilized Gated Single-Photon Emission Computed Tomography (G-SPECT) to assess myocardial perfusion and wall motion in 36 heart failure patients.
- Evaluations were performed before CRT (T0), at 2 months (T1), and 6 months (T2), with a clinical follow-up of 36 months.
Main Results:
- Significant improvements in perfusion (92%), left ventricular volumes, ejection fraction (EF), and regional wall motion were observed by 2 months post-CRT.
- These improvements largely stabilized by 6 months, indicating rapid therapeutic effects.
- Baseline perfusion defect extent showed a weak correlation with CRT response, while end-diastolic volume, perfusion defect size, and diabetes mellitus independently predicted survival.
Conclusions:
- The primary benefits of CRT on regional myocardial perfusion and wall motion manifest within the initial 2 months.
- Ventricular function recovery is modulated by volume overload, independent of reperfusion.
- Perfusion abnormalities and diabetes are significant independent predictors of long-term survival in CRT patients.
Abstract:
In patients treated with CRT no data relative to the relationship between regional wall motion and perfusion and reverse remodelling of the left ventricle at short and medium term followup were available. To this aim, 36 heart failure patients were studied by G-SPECT before (T0), within 2 months (T1) and 6 months (T2) after CRT. A clinical followup was completed for 36 months. In 30/36 patients there was an improvement of NYHA Class at T1 that persisted at T2. G-SPECT showed significant improvement of perfusion at T1 in 92% of patients without further changes at T2. A reduction of LV volumes, an increase of EF and an improvement of regional wall motion and thickening were observed at T1 versus baseline, with only minor changes at T2. Moreover, baseline extension of perfusion defects was scarcely correlated with improvement after CRT. Finally, end diastolic volume, perfusion defect and diabetes mellitus were independent predictors of survival. The main effects of CRT on regional myocardial perfusion and wall motion are obtained within 2 months. Volume overload modulates recovery of ventricular function independently of reperfusion and, with extension of perfusion abnormalities and diabetes were independent predictors of survival during followup.
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