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Ann Thorac Surg 1995;60:797-800
© 1995 The Society of Thoracic Surgeons
Division of Cardiothoracic Surgery, The Children's Hospital of Buffalo and School of Medicine, The State University of New York at Buffalo, Buffalo, New York
Abstract
Background. The development of myocardial protective strategies depends on a complete understanding of the pathophysiology of myocardial ischemia and reperfusion. This article reviews the rationale for inclusion of metabolic substrates in cardioplegic solutions on the basis of our current understanding of the underlying pathophysiologic pathways and speculates on the inclusion of future additives that await further investigation.
Methods. The pathophysiology of myocardial ischemia and reperfusion was evaluated from an extensive review of the pertinent literature. Experimental and clinical studies supporting the inclusion of metabolic substrates in clinical cardioplegic solutions were reviewed and summarized. Speculation on possible future additives to these formulas was made on the basis of encouraging, albeit preliminary, experimental data.
Results. Sound experimental and clinical evidence supports the inclusion of glucose, amino acids, calcium chelators, and oxygen as fundamental substrate additives to current cardioplegic solutions. Antioxidants, calcium-channel blockers, and tricarboxylic acid cycle intermediates may be of value. Adenosine, potassium--adenosine triphosphate channel modulators, and nitric oxide may join these lists after further research.
Conclusions. Substrate enhancement of clinical cardioplegic solutions is based on physiologic principles that have been confirmed in the clinical setting. Further definition of the intricacies of myocardial ischemia and reperfusion promises to expand the current list of additives.
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