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Continuous normothermic retrograde cardioplegia for valve surgery
A T Martella1, D M Hoffman, T Nakao
1Department of Cardiothoracic Surgery, Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, New York.
The Journal of Heart Valve Disease
|July 1, 1994
Summary
Continuous warm blood cardioplegia during normothermic cardiopulmonary bypass (CPB) in valvular surgery reduced perioperative myocardial infarction and improved cardiac output. This warm heart surgery technique also led to a higher incidence of spontaneous sinus rhythm and shorter reperfusion times compared to cold cardioplegia.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Cardioplegia Techniques
Background:
- Intermittent cold blood cardioplegia is a standard technique for myocardial protection during valvular surgery.
- Normothermic cardiopulmonary bypass (CPB) offers potential advantages but requires effective myocardial preservation strategies.
Purpose of the Study:
- To evaluate continuous warm blood cardioplegia delivered retrogradely via the coronary sinus (CNRC) as an alternative to intermittent cold blood cardioplegia (ICBC) for valvular surgery.
- To compare perioperative outcomes between warm and cold cardioplegia techniques.
Main Methods:
- A prospective study of 137 consecutive patients undergoing valve repair or replacement using normothermic CPB.
- Eighty-six patients received continuous normothermic retrograde blood cardioplegia (CNRC), while 51 received intermittent cold blood cardioplegia (ICBC).
- Groups were matched for key demographic and clinical characteristics.
Main Results:
- The CNRC group showed significantly lower prevalence of perioperative myocardial infarction (4.6% vs. 8.0%, p < 0.05).
- Cardiac output immediately post-bypass was significantly higher in the CNRC group (p < 0.01).
- CNRC patients had a higher incidence of spontaneous sinus rhythm (93% vs. 27%, p < 0.001) and shorter reperfusion times (43 min vs. 75 min, p < 0.001).
Conclusions:
- Continuous normothermic retrograde blood cardioplegia via the coronary sinus is a safe and effective alternative to intermittent cold cardioplegia for valvular surgery.
- This warm heart surgery approach improves myocardial protection, enhances early cardiac function, and facilitates faster recovery.