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Effects of coronary grafting technique upon reperfusion cardiac rhythm, ventricular function, and other variables
Insights
Traditional bypass grafting improved spontaneous cardiac rhythm but increased cardiac failure risk. Performing proximal anastomoses before cardiopulmonary bypass may be a safer alternative for coronary artery bypass surgery.
Area of Science:
- Cardiovascular Surgery
- Cardiac Electrophysiology
- Myocardial Protection
Background:
- Systematic evaluation of aortocoronary bypass grafting techniques on cardiac rhythm and function is lacking.
- Traditional grafting involves native artery reperfusion, while newer methods explore pre-bypass anastomoses and sequential grafting.
Purpose of the Study:
- To prospectively compare traditional grafting with a technique involving proximal anastomoses before cardiopulmonary bypass.
- To evaluate the impact of these techniques on reperfusion cardiac rhythm and ventricular function.
Main Methods:
- Prospective comparison of two aortocoronary bypass grafting techniques.
- Measurement of over 40 variables including biochemical, thermal, temporal, hemodynamic, and arrhythmias.
- Intraoperative and postoperative monitoring of cardiac rhythm and ventricular function.
Main Results:
- Spontaneous cardiac rhythm resumption was more frequent with traditional grafting, associated with higher cardioplegia volume and serum potassium.
- Traditional technique led to a higher incidence of postoperative cardiac failure and increased isoproterenol use.
- The newer technique showed potential benefits despite less frequent spontaneous rhythm resumption.
Conclusions:
- While traditional grafting may promote quicker spontaneous rhythm, it carries a higher risk of postoperative cardiac failure.
- Placement of proximal anastomoses before cardiopulmonary bypass appears to be a warranted and potentially safer approach.
Abstract:
The effects of different techniques of aortocoronary bypass grafting on reperfusion cardiac rhythm and ventricular function have not been systematically evaluated for possible advantages or disadvantages. The placement of proximal anastomoses before cardiopulmonary bypass and sequential coronary grafting with reperfusion via both the grafts and the native circulation were prospectively compared to traditional grafting and reperfusion via native arteries. More than 40 biochemical, thermal, temporal, hemodynamic, and other variables, including arrhythmias and myocardial failure, were measured intraoperatively and postoperatively. Spontaneous resumption of a cardiac rhythm occurred more frequently with traditional grafting technique in association with a larger cardioplegia volume and a higher serum potassium. However, the disadvantage of the traditional technique was a higher incidence of cardiac failure postoperatively and greater use of isoproterenol after discontinuation of bypass. While cardiac rhythm resumed spontaneously more often with the traditional technique, the increased incidence of cardiac failure postoperatively has serious implications. Thus, placement of proximal anastomoses before cardiopulmonary bypass seems warranted.