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[Deep selective myocardial hypothermia (author's transl)]
Insights
This study introduces a novel myocardial protection method using cold Ringer lactate perfusion to prevent cardiac ischemia during aortic clamping. This technique offers superior protection compared to existing methods in over 250 cardiac surgeries.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Cardiomyocyte Physiology
Context:
- Cardiac surgery often involves aortic clamping, leading to myocardial ischemia.
- Existing methods for myocardial protection include coronary perfusion and hypothermia.
- Shumway's technique is a conventional approach to hypothermic cardiac arrest.
Purpose:
- To present a new method for myocardial protection during cardiac surgery.
- To evaluate the efficacy of cold Ringer lactate perfusion in preventing ischemia-reperfusion injury.
- To compare this novel technique with established methods like Shumway's.
Summary:
- A technique involving perfusion of coronary arteries with 4 liters of 4°C Ringer lactate solution was employed.
- This induces a uniform, deep hypothermia and cardiac asystole (flat electrocardiogram) during aortic clamping.
- Reperfusion upon aortic clamp release restores cardiac temperature and function.
Impact:
- The method has been successfully used in over 250 cardiothoracic operations, including valve replacements, bypass procedures, and transplants.
- This technique has demonstrated superior outcomes compared to traditional coronary perfusion or Shumway's hypothermia methods.
- Offers enhanced myocardial protection, potentially reducing perioperative complications in cardiac surgery.
Abstract:
This new method of myocardial protection was used to prevent complications of cardiac ischaemia during clamping of the aorta. 4 litres of Ringer lactate at 4 degrees C are used to perfuse the coronary arteries and produce a total, uniform and deep fall of all the pericardial and myocardial system. This results in a flat electrocardiogram, i.e. the interruption of electrical activity of the cardiac cells. This effect persists until the aortic clamp is released which results in reoxygenation, a rise in temperature and the restoration of function. The method has been used in more than 250 operations with extracorporeal circulation (valves, bypass procedures, transplants). Up until the present, it has proved superior to techniques of coronary perfusion or hypothermia obtained using Shumway's technique.