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Ann Thorac Surg 1998;66:2037-2043
© 1998 The Society of Thoracic Surgeons
a Division of Cardiothoracic Surgery and Biometrics Center, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
Accepted for publication June 11, 1998.
Address reprint requests to Dr McCully, Division of Cardiothoracic Surgery, Beth Israel Deaconess Medical Center, Harvard Institutes of Medicine, 77 Avenue Louis Pasteur, Room 144, Boston, MA 02115
Background. Recently we have reported a novel myoprotective protocol "adenosine-enhanced ischemic preconditioning" (APC), which extends and amends the protection afforded by ischemic preconditioning (IPC) by both reducing myocardial infarct size and enhancing postischemic functional recovery in the mature rabbit heart. However, the efficacy of APC in the senescent myocardium was unknown.
Methods. The efficacy of APC was investigated in senescent rabbit hearts and compared with magnesium-supplemented potassium cardioplegia (K/Mg) and IPC. Global ischemia (GI) hearts were subjected to 30 minutes of global ischemia and 120 minutes of reperfusion. Ischemic preconditioning hearts received 5 minutes of global ischemia and 5 minutes of reperfusion before global ischemia. Magnesium-supplemented potassium cardioplegia hearts received cardioplegia just before global ischemia. Adenosine-enhanced ischemic preconditioning hearts received a bolus injection of adenosine in concert with IPC. To separate the effects of adenosine from that of APC, a control group (ADO) received a bolus injection of adenosine 10 minutes before global ischemia.
Results. Infarct size was significantly decreased to 18.9% ± 2.7% with IPC (p < 0.05 versus GI); 17.0% ± 1.0% with ADO (p < 0.05 versus GI); 7.7% ± 1.3% with K/Mg (p < 0.05 versus GI, IPC, and ADO); and 2.1% ± 0.6% with APC (p < 0.05 versus GI, IPC, ADO, and K/Mg; not significant versus control). Only APC and K/Mg significantly enhanced postischemic functional recovery (not significant versus control).
Conclusions. Adenosine-enhanced ischemic preconditioning provides similar protection to K/Mg cardioplegia, significantly enhancing postischemic functional recovery and decreasing infarct size in the senescent myocardium.
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