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Reinfusion potassium blood cardioplegia versus cold blood reinfusion alone in elective revascularization
1Division of Cardiothoracic Surgery, St. Louis University Medical Center, MO 63110-0250.
Insights
Adding potassium to cold blood cardioplegia (CBC) showed no significant advantage over cold blood alone for myocardial protection in cardiac surgery. Both methods provided similar outcomes regarding cardiac function and enzyme release post-operation.
Area of Science:
- Cardiology
- Cardiac Surgery
- Cardioplegia
Background:
- Cold blood cardioplegia (CBC) is a standard method for myocardial protection during cardiac surgery.
- The role of potassium in reinfusion CBC requires further investigation to optimize its efficacy.
Purpose of the Study:
- To evaluate the efficacy of adding potassium to reinfusion cold blood cardioplegia compared to cold blood alone.
- To determine if potassium supplementation offers enhanced myocardial protection.
Main Methods:
- Prospective randomized study of 40 patients undergoing cardiac surgery.
- Patients were divided into two groups: one receiving potassium-enriched CBC, the other receiving cold blood only for subsequent infusions.
- Key clinical and biochemical markers were assessed post-reperfusion.
Main Results:
- No significant differences were observed in cardiac index, CPK isoenzyme release, or LDH isoenzyme ratio between the groups.
- Postoperative outcomes, including new Q-wave appearance and inotropic agent requirement, were comparable.
- Cross-clamp time, infusate volume, and temperature were similar in both study groups.
Conclusions:
- Following initial arrest with potassium, cold blood alone is as effective as potassium-supplemented cold blood cardioplegia for protecting ischemic myocardium.
- The addition of potassium to reinfusion CBC does not appear to offer a significant clinical advantage.
Abstract:
The purpose of this study was to determine if the addition of potassium to reinfusion cold blood cardioplegia (CBC) offers an advantage over cold blood alone. Forty patients matched for age, left ventricular function, extent of coronary disease and number of vessels bypassed were prospectively randomized. Each patient received an initial dose of CBC (10 cc/kg) with potassium. Group I patients (n = 23) received subsequent infusions of CBC (5 cc/kg) containing potassium while Group II patients (n = 17) received cold blood only. The cross-clamp time, mean infusate volume and temperature were not significantly different in the two groups. Following reperfusion, the cardiac index and the CPK isoenzyme release at 0.5, 1, 8, and 12 h after cross-clamp release were not significantly different between the groups. The postoperative appearance of new Q-waves, inotropic agent requirement, and reversal of the lactate dehydrogenase (LDH) isoenzyme ratio were also not significantly different in the two groups. The study demonstrated that following initial arrest with potassium, cold blood is equally as effective as potassium blood cardioplegia in protecting the ischemic myocardium.