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Ann Thorac Surg 1996;61:1310-1314
© 1996 The Society of Thoracic Surgeons

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Original Articles: Cardiovascular

Clinical Trial of Retrograde Warm Blood Reperfusion Versus Standard Cold Topical Irrigation of Transplanted Hearts

Departments of Surgery, Pathology, and Medical Biology, Montreal Heart Institute, Montreal, Quebec, Canada

Background. A prospective, randomized clinical study involving 34 patients undergoing heart transplantation compared myocardial preservation of donor hearts maintained with continuous reperfusion with retrograde warm blood cardioplegia during surgical implantation versus the standard cold topical irrigation.

Methods. Hearts in both groups were arrested with a standard crystalloid solution and maintained in a cold saline solution during transportation. In the retrograde group, cardioplegia was administered through a catheter in the coronary sinus during surgical implantation. An average of 471 ± 30 mL of hyperkalemic crystalloid solution diluted 1:4 in warm blood from the oxygenator was infused. In the standard group, the heart was kept cold by topical irrigation of cold saline solution and was reperfused only when the ascending aorta was unclamped.

Results. Preoperative characteristics of donors and recipients were similar in the two cohorts. Ischemic time averaged 139 ± 12 minutes in the retrograde group compared with 130 ± 11 minutes in the standard group (p = 0.57). Cardiopulmonary bypass time averaged 89 ± 4 minutes in the retrograde group and 110 ± 12 minutes in the standard group (p = 0.12). Defibrillation at reperfusion was performed in 4 patients (4/17, 24%) in the retrograde group and 12 patients (12/18, 67%) in the standard group (p = 0.01). There were no deaths in the retrograde group (0/17), whereas in the standard group, 3 patients (3/17) died of early graft failure (p = 0.11). Four early graft failures occurred in the standard group (p = 0.06). Two patients (2/17, 12%) were weaned from bypass with ventricular assist devices in the standard group. The number of subendocardial necrotic cells in the first two weekly endomyocardial biopsy specimens averaged 2.7 ± 0.8 cells/mm² in the retrograde group and 5.9 ± 2.4 cells/mm² in the standard group (p = 0.12).

Conclusions. Retrograde warm blood reperfusion appears to improve the initial recovery of transplanted hearts. The technique is easy to use and may be a useful approach to graft protection during surgical implantation.

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Invited Commentary

Davis C. Drinkwater, Jr
Ann. Thorac. Surg. 1996 61: 1314-1315. [Extract] [Full Text]

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