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Myocardial protection during aortic valve replacement
Insights
Maintaining a beating heart during aortic valve replacement (AVR) with continuous coronary perfusion significantly improves post-operative cardiac performance compared to hypothermic arrest, reducing the need for inotropic support.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Myocardial Protection
Background:
- Aortic valve replacement (AVR) is a critical procedure for managing aortic valve disease.
- Effective myocardial protection strategies are essential to minimize cardiac damage during AVR.
- Current techniques include hypothermic arrest and continuous coronary perfusion.
Purpose of the Study:
- To compare the efficacy of two myocardial protection strategies during AVR.
- To evaluate the impact of sustained electrical fibrillation versus a beating heart on post-perfusion cardiac performance.
Main Methods:
- A prospective study comparing two groups of 40 patients undergoing AVR.
- Group A: Myocardial protection via topical hypothermic arrest or continuous coronary perfusion with sustained electrical fibrillation.
- Group B: Continuous coronary perfusion with the heart maintained in a beating state.
Main Results:
- Operative mortality was similar between groups (10% in Group A vs. 5% in Group B).
- Post-perfusion cardiac performance differed significantly: 43% of Group A patients required inotropic support versus only 3% in Group B.
- One patient in Group B experienced persistent ventricular fibrillation despite reversion attempts.
Conclusions:
- Continuous coronary perfusion with a beating heart is superior for myocardial preservation during AVR.
- This strategy leads to better post-operative cardiac function and reduced need for inotropic support.
- Maintaining the heart in a beating state optimizes myocardial protection in AVR patients.
Abstract:
The results following aortic valve replacement (AVR) were compared in 40 patients in whom the myocardium was protected by topical hypothermic arrest or continuous coronary perfusion with sustained electrical fibrillation (Group A) and 40 similar patients in whom the hearts were also continuously perfused but were kept in the beating state (Group B). The operative mortality was not greatly different between the two groups, being 10 and 5%, respectively. The postperfusion cardiac performance was strikingly different, however. Seventeen patients (43%) in Group A required inotropic support, while this was necessary in only 1 patient (3%) in Group B. In this instance, recurrent ventricular fibrillation persisted despite attempts at reversion. These data show that the myocardium is preserved best during AVR when continuous coronary perfusion is used and the heart is maintained in the beating state.