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The Journal of Thoracic and Cardiovascular Surgery, Vol 86, 659-666, Copyright © 1983 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Improved myocardial preservation during global ischemia by continuous retrograde coronary sinus perfusion

SF Bolling, JT Flaherty, BH Bulkley, VL Gott and TJ Gardner

To investigate whether retrograde continuous low-pressure perfusion of the coronary sinus could deliver cardioplegic solutions with oxygen and substrate beyond stenoses and result in improved myocardial preservation, we subjected 41 canine hearts to 90 minutes of ischemia with an occlusion on the circumflex coronary artery. There were four groups: Group I, antegrade (aortic root) crystalloid cardioplegia every 30 minutes during ischemia; Group II, antegrade plus topical cooling; Group III, continuous retrograde perfusion; Group IV, same as Group III, with an oxygenated perfluorocarbon. All solutions had a PO2 of 400 to 500 mm Hg. Intramyocardial oxygen and carbon dioxide tensions (PO2 and PCO2) and mean myocardial temperatures were monitored during ischemia, and left ventricular (LV) function was assessed before ischemia and after reperfusion. After global ischemia, the circumflex occlusion was released and the hearts reperfused. Following 60 minutes of reperfusion, isovolumic developed pressure returned to 36% +/- 4% and 41% +/- 5% of preischemic levels, respectively, in Groups I and II. By contrast, Groups III and IV (retrograde perfusion) had a significantly greater percent of recovery (78% +/- 5% and 73% +/- 5%). Circumflex area intramyocardial PO2 fell 20 and 25 mm Hg below preischemic levels in Groups I and II during ischemia, whereas in Group III, intramyocardial PO2 in the circumflex region remained near preischemic levels, and in Group IV, it rose 19 mm Hg. Mean myocardial temperature during ischemia in the circumflex area was significantly higher in Group I than in Groups II, III, and IV. Peak intramyocardial PCO2 in the circumflex region was significantly less in the retrogradely perfused hearts. Retrograde coronary sinus perfusion resulted in significant improvement in recovery of LV function, uniform myocardial cooling, normal intramyocardial PO2, and less intramyocardial PCO2 accumulation, despite the presence of a total circumflex coronary artery occlusion.

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