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Ann Thorac Surg 1984;38:268-274
© 1984 The Society of Thoracic Surgeons

Articles

Comparison of the Protective Properties of Four Clinical Crystalloid Cardioplegic Solutions in the Rat Heart

Lary A. Robinson, M.D.*, Mark V. Braimbridge, F.R.C.S., David J. Hearse, D.Sc.

Heart Research Unit, The Rayne Institute, St. Thomas' Hospital, London, England the Department of Surgery, Duke University Medical Center, Durham, NC

* Address reprint requests to Dr. Robinson, Section of Thoracic and Cardiovascular Surgery, University of Nebraska Medical Center, 42nd St and Dewey Ave, Omaha, NE 68105


   Abstract
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 Abstract
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Although few surgeons dispute the benefits of high-potassium crystalloid cardioplegia, objective comparison of the efficacy of various formulations is difficult in clinical practice. We compared four commonly used cardioplegic solutions in the isolated rat heart (N = 6 for each solution) subjected to 180 minutes of hypothermic (20°C) ischemic arrest with multidose cardioplegia (3 minutes every half-hour). The clinical solutions studied were St. Thomas' Hospital solution, Tyers' solution, lactated Ringer's solution with added potassium, and a balanced saline solution with glucose and potassium. Postischemic recovery of function was expressed as a percentage of preischemic control values. Release of creatine kinase during reperfusion was measured as an additional index of protection.

St. Thomas' Hospital solution provided almost complete recovery of all indexes of cardiac function following ischemia including 88.1 ± 1.6% recovery of aortic flow, compared with poor recovery for the Tyers', lactated Ringer's, and balanced saline solutions (20.6 ± 6.5%, 12.5 ± 6.4%, and 9.6 ± 4.2%, respectively) (p < 0.001). Spontaneous defibrillation was rapid (less than 1 minute) and complete (100%) in all hearts in the St. Thomas' Hospital solution group, but much less satisfactory with the other formulations. Finally, St. Thomas' Hospital solution had a low postischemic level of creatine kinase leakage, contrasting with significantly higher enzyme release in the other solutions tested (p < 0.001).

Although differences in composition are subtle, all potassium crystalloid cardioplegic solutions are not alike in the myocardial protection they provide. Comparative studies under controlled conditions are important to define which formulation is superior for clinical application.


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Presented at the Thirtieth Annual Meeting of the Southern Thoracic Surgical Association, Marco Island, FL, Nov 3–5, 1983.

This work was supported in part by grants from the British Heart Foundation and the St. Thomas' Hospital Research Endowments Fund.


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 Abstract
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