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Controlled initial hyperkalemic reperfusion after cardiac transplantation: coronary vascular resistance and blood
J K Kirklin1, J Neves, D C Naftel
1Department of Surgery, University of Alabama, Birmingham 35294.
Insights
Controlled hyperkalemic reperfusion in heart transplants showed initially high coronary blood flow and low resistance. However, increased potassium load correlated with delayed effective contraction, impacting graft function.
Area of Science:
- Cardiovascular Surgery
- Transplantation Medicine
- Cardiac Physiology
Background:
- Global ischemia is a critical factor in heart transplantation.
- Donor heart preservation and reperfusion strategies are vital for graft survival.
- Understanding coronary vascular response post-transplant is essential for optimizing outcomes.
Purpose of the Study:
- To investigate the coronary vascular response to controlled initial hyperkalemic reperfusion.
- To assess the relationship between potassium load and graft function recovery.
Main Methods:
- Studied 11 patients undergoing cardiac transplantation.
- Utilized controlled initial hyperkalemic crystalloid cardioplegia followed by oxygenated cardioplegia.
- Monitored coronary blood flow, coronary vascular resistance, and systemic vascular resistance.
Main Results:
- Coronary blood flow peaked in the first 1-2 minutes and remained normal for 10 minutes.
- Coronary vascular resistance was lower than normal initially, with a gradual increase.
- Higher potassium load during reperfusion was linked to a longer time to effective contraction.
Conclusions:
- Controlled hyperkalemic reperfusion supports initial coronary perfusion in transplanted hearts.
- The timing and extent of graft contraction are influenced by the potassium load during reperfusion.
- Further research may optimize reperfusion protocols to balance vascular response and functional recovery.
Abstract:
The coronary vascular response to controlled initial hyperkalemic reperfusion after global ischemia during cardiac transplantation was studied in 11 patients. The mean global ischemic time was 206 minutes (range, 143 to 245 minutes). All donor hearts received initial hyperkalemic crystalloid cardioplegia and subsequent oxygenated crystalloid cardioplegia during implantation. Coronary blood flow was highest during the first one to two minutes of controlled reperfusion but remained normal throughout the first ten minutes of reperfusion. Coronary vascular resistance was less than normal throughout the first ten minutes of controlled reperfusion, but there was a gradual increase throughout this period. Systemic vascular resistance remained within normal limits. The time to effective contraction was highly variable, but a greater potassium load during initial reperfusion was generally associated with a longer time to effective contraction.