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J Thorac Cardiovasc Surg 1998;116:154-158
© 1998 Mosby, Inc.

Cardiopulmonary Support And Physiology

Adenosine-enhanced ischemic preconditioning provides enhanced postischemic recovery and limitation of infarct size in the rabbit heart

This study was supported by the National Institutes of Health (HL 29077) and the American Heart Association.

Received for publication April 17, 1997. Revisions requested June 6, 1997; revisions received Feb. 11, 1998. Accepted for publication Feb. 19, 1998. Address for reprints: James D. McCully, PhD, Division of Cardiothoracic Surgery, Beth Israel Deaconess Medical Center, 110 Francis St., Suite 2C, Boston, MA 02215.

Objective: The purpose of this study was to determine the effect of an intracoronary bolus injection of adenosine used in concert with ischemic preconditioning on postischemic functional recovery and infarct size reduction in the rabbit heart and to compare adenosine-enhanced ischemic preconditioning with ischemic preconditioning and magnesium-supplemented potassium cardioplegia.
Methods: New Zealand White rabbits (n = 36) were used for Langendorff perfusion. Control hearts were perfused at 37° C for 180 minutes; global ischemic hearts received 30 minutes of global ischemia and 120 minutes of reperfusion; magnesium-supplemented potassium cardioplegic hearts received cardioplegia 5 minutes before global ischemia; ischemic preconditioned hearts received 5 minutes of zero-flow global ischemia and 5 minutes of reperfusion before global ischemia; adenosine-enhanced ischemic preconditioned hearts received a bolus injection of adenosine just before the preconditioning. To separate the effects of adenosine from adenosine-enhanced ischemic preconditioning, a control group received a bolus injection of adenosine 10 minutes before global ischemia.
Results: Infarct volume in global ischemic hearts was 32.9% ± 5.1% and 1.03% ± 0.3% in control hearts. The infarct volume decreased (10.23% ± 2.6% and 7.0% ± 1.6%, respectively; p < 0.001 versus global ischemia) in the ischemic preconditioned group and control group, but this did not enhance postischemic functional recovery. Magnesium-supplemented potassium cardioplegia and adenosine-enhanced ischemic preconditioning significantly decreased infarct volume (2.9% ± 0.8% and 2.8% ± 0.55%, respectively; p < 0.001 versus global ischemia, p = 0.02 versus ischemic preconditioning and p = 0.05 versus control group) and significantly enhanced postischemic functional recovery.
Conclusions: Adenosine-enhanced ischemic preconditioning is superior to ischemic preconditioning and provides equal protection to that afforded by magnesium-supplemented potassium cardioplegia.

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