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Assessment of continuous cold blood cardioplegia in coronary artery bypass grafting
Y A Louagie1, E Gonzalez, J Jamart
1Unit of Cardiovascular, Surgery, University Hospital of Mont-Godinne (Catholic University of Louvain), Mont-Yvoir, Belgium.
Insights
Continuous retrograde cold blood cardioplegia (CBCP) significantly reduced major cardiac events. This method also improved both left and right ventricular function compared to intermittent antegrade or retrograde delivery.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Cardioplegia Delivery Techniques
Background:
- Cold blood cardioplegia (CBCP) is a critical component of cardiac surgery.
- Optimizing CBCP delivery is essential for improving patient outcomes.
- Previous methods varied in administration rate (intermittent vs. continuous) and direction (antegrade vs. retrograde).
Purpose of the Study:
- To compare the efficacy of continuous retrograde CBCP with intermittent antegrade and retrograde CBCP.
- To evaluate the impact of different CBCP delivery methods on major adverse cardiac events and hemodynamic performance.
Main Methods:
- A retrospective study of 298 patients undergoing isolated coronary artery bypass grafting.
- Patients were divided into three groups based on CBCP delivery: Group I (antegrade, intermittent), Group II (retrograde, intermittent), and Group III (retrograde, continuous).
- Demographic and clinical data, including major adverse cardiac outcomes and hemodynamic indices, were analyzed.
Main Results:
- The incidence of major adverse cardiac events was significantly lower in the continuous retrograde group (0.9%) compared to intermittent groups (7.0% and 8.0%).
- Continuous retrograde CBCP demonstrated superior left ventricular stroke work index compared to antegrade intermittent CBCP (p < 10(-4)).
- Right ventricular stroke work index showed marked improvement with continuous retrograde CBCP compared to both intermittent methods (p < 10(-5)).
Conclusions:
- Continuous retrograde cold blood cardioplegia significantly reduces major cardiac events.
- This delivery method leads to better left ventricular performance and improved right ventricular function.
- Continuous retrograde CBCP offers a superior alternative to intermittent delivery methods for improving myocardial protection during cardiac surgery.
Background:
A method of cold blood cardioplegia (CBCP) delivered continuously and in a retrograde manner was compared with methods differing only by their rate (intermittent) or way (antegrade) of administration.
Methods:
This study comprises 298 consecutive patients undergoing isolated coronary artery bypass grafting procedures performed by the same surgeon from 1992 to 1995. Three-vessel disease characterized 58.8% of the cases, and the left ventricular ejection fraction was less than 0.40 in 22.8%. In group I (n = 100), CBCP was administered in an antegrade and intermittent fashion; in group II (n = 87), CBCP was given in a retrograde and intermittent manner; in group III (n = 111), CBCP delivery was retrograde and continuous.
Results:
The incidence of major cardiac adverse outcome (death or need for intraaortic balloon counterpulsation) was 7.0% in group I, 8.0% in group II, and 0.9% in group III (p = 0.040). Repeated-measures analysis of hemodynamic indices showed a marked superiority of continuous retrograde compared with antegrade intermittent blood cardioplegia regarding left ventricular stroke work index (p < 10(-4)) and compared with both methods of intermittent CBCP regarding right ventricular stroke work index (p < 10(-5)).
Conclusions:
The use of continuous CBCP resulted in a significant reduction in major cardiac events, better left ventricular performance, and a marked improvement of right ventricular function in comparison with similar solutions of blood cardioplegia administered intermittently, independent of their way of delivery.