Related Experiment Videos
A technique of myocardial protection during aorto-coronary bypass in high-risk patients
Insights
Profound myocardial hypothermia, achieved through efficient topical cooling, is crucial for protecting the heart during aortic cross-clamping. This method safely extends surgical ischemic times to over two hours.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Cardiothoracic Research
Background:
- Myocardial protection during aortic cross-clamping is critical in cardiac surgery.
- Maintaining low myocardial temperatures is essential to minimize ischemic injury.
- Current methods require optimization for prolonged surgical procedures.
Purpose of the Study:
- To present an effective method for achieving profound myocardial hypothermia.
- To demonstrate the safety and efficacy of topical cooling for myocardial protection.
- To evaluate the impact of this method on extended surgical ischemic times.
Main Methods:
- Utilizing a single dose of crystalloid cardioplegic solution.
- Implementing highly efficient topical cooling with continuous fluid circulation (0-2°C at 2 L/min).
- Employing a 10-15 meter metal coil immersed in an ice-salt bath with a water pump for enhanced heat exchange.
Main Results:
- Achieved and maintained myocardial temperatures below 15°C.
- Demonstrated a stable profound myocardial hypothermia.
- Safely extended the permissible aortic cross-clamp time to over two hours.
Conclusions:
- Efficient topical cooling is a reliable method for achieving profound myocardial hypothermia.
- This technique enhances myocardial protection during cardiac surgery.
- The method allows for significantly longer ischemic periods, improving surgical feasibility.
Abstract:
In the authors' opinion, profound myocardial hypothermia is imperative in myocardial protection while the aorta is cross-clamped. They based their own protection method, beside using a single dose of crystalloid cardioplegic solution, on very efficient topical cooling, by which myocardial temperature is reduced to below 15 degrees C. Very efficient topical cooling is achieved by a high flow (2 l/min) of continuously cooled fluid (0 degrees C- +2 degrees C). The great temperature-reducing capacity of the cooling system is due to 10-15 metres long metal coil tubing which is immersed in an ice-salt cold bath. The water pump placed in the bath makes heat exchange even more efficient. The described method of myocardial protection with stable profound myocardial hypothermia safely prolongs the ischaemic time during operation to more than two hours.