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Evidence of improved microvascular perfusion when using antegrade and retrograde cardioplegia
1Department of Surgery, University of California Los Angeles Medical Center 90095-1741, USA.
Insights
Adding retrograde cardioplegia to antegrade cardioplegia significantly improves myocardial perfusion. This combined approach enhances microvascular distribution, ensuring better cardiac protection during procedures.
Area of Science:
- Cardiovascular Surgery
- Cardiac Physiology
- Myocardial Protection
Background:
- Optimal myocardial protection relies on maximal microvascular distribution of cardioplegic solutions.
- Antegrade cardioplegia is standard, but its perfusion limits are debated.
Purpose of the Study:
- To investigate if combined antegrade and retrograde cardioplegia improves myocardial microvascular perfusion compared to antegrade delivery alone.
Main Methods:
- Explanted human hearts underwent cardioplegic arrest and cardiectomy.
- Simultaneous antegrade (80 mm Hg) and retrograde (40 mm Hg) infusion of colored microsphere-labeled cardioplegia.
- Myocardial samples analyzed for microvascular flow distribution.
Main Results:
- Retrograde cardioplegia contributed 27% to 32% of total microvascular capillary flow.
- This perfusion occurred despite simultaneous delivery and lower retrograde pressure.
Conclusions:
- Antegrade cardioplegia alone does not perfuse all myocardial capillaries.
- Simultaneous retrograde cardioplegia substantially enhances overall microvascular distribution and perfusion.
- Combining antegrade and retrograde delivery improves cardioplegic solution distribution for better myocardial protection.
Background:
The maximum degree of microvascular distribution of cardioplegic solution is considered important to achieve optimum myocardial protection. This study attempts to demonstrate that the addition of retrograde cardioplegia to antegrade cardioplegia improves overall microvascular perfusion.
Methods:
Explanted human hearts (n = 6) were treated with cold cardioplegic arrest and bicaval cardiectomy. Blood cardioplegia (37 degrees C) containing colored microspheres (color A for antegrade, color B for retrograde) was simultaneously infused antegrade at a pressure of 80 mm Hg and retrograde at a pressure of 40 mm Hg for 2 minutes. The ventricular myocardium was then sampled at three sites to determine absolute and relative cardioplegic microvascular flow.
Results:
Of the total microvascular capillary flow, 27% to 32% was found to be the contribution of retrogradely delivered cardioplegia.
Conclusions:
Despite being delivered simultaneously and at a lower pressure, retrograde cardioplegia contributed substantially to overall microvascular perfusion. This suggests that antegrade cardioplegia alone does not perfuse all available myocardial capillaries and that the addition of retrograde cardioplegia enhances overall microvascular distribution and perfusion.