Improved distribution of antegrade cardioplegic solution with simultaneous coronary sinus occlusion following acute
1Department of Surgery, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115.
Insights
Simultaneous coronary sinus occlusion improves cardioplegic solution delivery to occluded heart muscle. This method enhances antegrade and retrograde distribution, benefiting myocardial protection during cardiac procedures.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Cardioplegia Delivery
Background:
- Effective delivery of cardioplegic solution is crucial for myocardial protection during cardiac surgery.
- Regional myocardial ischemia, such as that caused by Left Anterior Descending (LAD) occlusion, presents challenges for uniform solution distribution.
- Antegrade infusion is a common method, but its efficacy in ischemic regions can be limited.
Purpose of the Study:
- To evaluate the distribution of cardioplegic solution when infused antegradely with and without simultaneous coronary sinus occlusion.
- To determine if combined antegrade cardioplegia and coronary sinus occlusion improves solution delivery to the myocardium distal to LAD occlusion.
Main Methods:
- Sheep model with LAD occlusion and cardiopulmonary bypass.
- Arrest of the heart using cold cardioplegia, with subsequent doses administered antegradely.
- Group I: Antegrade cardioplegia (ACP) alone. Group II: ACP with simultaneous coronary sinus occlusion.
- Microspheres used to quantify antegrade distribution via the cardioplegic line and retrograde distribution via the anterior interventricular vein.
Main Results:
- Myocardium distal to LAD occlusion in Group II showed significantly greater antegrade cardioplegic solution distribution compared to Group I (subendocardium: 0.17 vs. 0.06 ml/g/min; subepicardium: 0.15 vs. 0.09 ml/g/min).
- Retrograde distribution (venous backflow) of cardioplegic solution was significantly higher in Group II (2181-2146 counts/g/min) compared to Group I (0 counts/g/min).
- These differences were statistically significant (P < 0.01 for most comparisons).
Conclusions:
- Simultaneous coronary sinus occlusion significantly enhances the distribution of antegrade cardioplegic solution to regionally occluded myocardium.
- The improved distribution is attributed to increased collateral flow and venous backflow.
- This combined approach offers a potential strategy to optimize myocardial protection in the setting of localized coronary artery occlusion.
Abstract:
This study was designed to evaluate the distribution of cardioplegic solution infused antegradely with simultaneous coronary sinus occlusion. After 1 hr LAD occlusion, sheep were placed on cardiopulmonary bypass. Hearts were arrested with 300 ml of cold cardioplegia and replenished with two additional doses. In group I (n = 10), antegrade cardioplegia (ACP) was given alone; in group II (n = 9), ACP was given in combination with simultaneous coronary sinus occlusion. Microspheres were infused into the cardioplegic line to determine the antegrade distribution of the solution, while a different microsphere was injected into the anterior interventricular vein to detect the venous backflow of the solution. The data showed that myocardium distal to LAD occlusion in group II received more antegrade (0.17 +/- 0.02 versus 0.06 +/- 0.02 ml/g/min, P less than 0.01, in subendocardium; and 0.15 +/- 0.03 versus 0.09 +/- 0.02 ml/g/min, P = NS, in subepicardium) and retrograde (2181 +/- 455 versus 0 counts/g/min, P less than 0.01, in subendocardium; and 2,146 +/- 527 versus 0 counts/g/min, P less than 0.01, in subepicardium) distribution of cardioplegic solution in comparison to group I. We therefore conclude that simultaneous coronary sinus occlusion significantly improves the distribution of antegrade cardioplegic solution to the regionally occluded myocardium by increasing collateral flow as well as venous backflow.
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