[Cooling of the myocardium: clinical comparison of 2 methods of administering the cardioplegic solution]
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Retrograde infusion of cardioplegic solution via the right atrium effectively cools the heart muscle during valve repair. This method ensures adequate hypothermia, crucial for protecting the hypertrophied myocardium.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Cardiothoracic Medicine
Background:
- Myocardial temperature management is critical during heart valve repair surgery.
- Antegrade infusion of cardioplegic solutions may lead to inadequate cooling, especially in hypertrophied ventricles.
Purpose of the Study:
- To compare the effectiveness of antegrade versus retrograde cardioplegic solution infusion on myocardial temperature dynamics.
- To evaluate the potential of retrograde infusion for achieving adequate myocardial hypothermia during prosthetic heart valve repair.
Main Methods:
- Prospective study comparing two groups of patients undergoing prosthetic heart valve repair.
- Group 1: Oxygenated cardioplegic solution infused antegrade via the aortic root.
- Group 2: Oxygenated cardioplegic solution infused retrograde via the right atrium.
Main Results:
- Retrograde infusion through the right atrium achieved adequate cooling of both ventricles, even in hypertrophied myocardium.
- Antegrade infusion did not yield comparable cooling results.
- Safe levels of myocardial hypothermia were attainable exclusively with retrograde infusion.
Conclusions:
- Retrograde infusion of cardioplegic solution via the right atrium is an effective method for myocardial protection during heart valve surgery.
- This technique combines perfusion and local hypothermia, offering superior cooling compared to antegrade infusion.
- The findings support the use of retrograde infusion for optimizing myocardial temperature management in specific patient populations.
Abstract:
The authors studied the dynamics of changes in myocardial temperature in injection of an oxygenated cardioplegic solution through the root of the aorta (group 1 of patients) and through the right atrium (group 2) during prosthetic repair of the heart valves. Retrograde injection of the cardioplegic solution through the right atrium ensured adequate cooling of the hypertrophied myocardium of both ventricles and did not yield to antegrade infusion. It proved possible to attain a safe level of right-atrial hypothermia only when the cardioplegic solution was infused through the right atrium. This is due to the fact that the method combined the features of perfusion and local hypothermia.