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Acute decrease of left ventricular mechanical dyssynchrony and improvement of contractile state and energy efficiency
Jan J Schreuder1, Alessandro Castiglioni, Francesco Maisano
1Department of Cardiac Surgery, San Raffaele University Hospital, Milan, Italy. schreuder@libero.it
The Journal of Thoracic and Cardiovascular Surgery
|January 6, 2005
Summary
Surgical left ventricular restoration significantly improves heart function after a heart attack. The procedure enhances energy efficiency and reduces mechanical dyssynchrony, leading to better overall cardiac performance.
Area of Science:
- Cardiovascular Surgery
- Cardiac Mechanics
- Heart Failure Management
Background:
- Postinfarction left ventricular aneurysm impairs cardiac performance.
- Mechanical dyssynchrony and reduced energy efficiency are key issues in these patients.
Purpose of the Study:
- To evaluate the acute effects of endoventricular patch aneurysmectomy on left ventricular performance.
- To assess changes in mechanical dyssynchrony and energy efficiency following surgical restoration.
Main Methods:
- Nine patients with left ventricular postinfarction aneurysm underwent intraoperative assessment.
- A conductance volume catheter was used to analyze pressure-volume relationships, energy efficiency, and mechanical dyssynchrony.
- End-systolic elastance served as a load-independent index of contractile state.
Main Results:
- Endoventricular patch aneurysmectomy reduced end-diastolic volume by 37% and improved systolic function (+dP/dt(max) by 42%, ejection fraction by 16%).
- Diastolic function improved with reduced -dP/dt(max) (34%) and shortened tau (30%).
- Left ventricular energy efficiency increased by 36%, and mechanical dyssynchrony decreased by 33% (systolic) and 20% (diastolic).
Conclusions:
- Left ventricular restoration via endoventricular patch aneurysmectomy acutely improves contractile state and relaxation.
- The procedure significantly enhances left ventricular energy efficiency and reduces mechanical dyssynchrony.