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Ann Thorac Surg 1994;58:1481-1485
© 1994 The Society of Thoracic Surgeons
Division of Cardiothoracic Surgery, University of Texas Medical Branch, Galveston, Texas USA
Accepted for publication May 9, 1994.
* Address reprint requests to Dr Illes, Division of Cardiothoracic Surgery, University of Texas Medical Branch, Room 6.120 John Sealy, Galveston, TX 77550-0528.
Ischemic preconditioning has not been investigated in a clinically relevant model of hypothermic multidose cardioplegia arrest. Using isolated rabbit hearts perfused on a Langendorff apparatus, ischemic preconditioning was investigated as an adjunct to crystalloid cardioplegia during a 2.5-hour ischemic period at 15 °C. After baseline functional data were obtained, ischemic preconditioning was induced with either 1 minute or 5 minutes of normothermic ischemia, followed by 5 minutes of reperfusion before the arrest period. Control hearts underwent no ischemic preconditioning. The control hearts exhibited a decrement in both the peak developed pressure and diastolic function, as measured by the slope of the diastolic pressure-volume relationship, of from 107 ± 2 to 68 ± 7 mm Hg (p < 0.005) and from 0.99 ± 0.2 to 2.95 ± 0.44 mm Hg/0.1 mL (p < 0.005), respectively. Hearts exposed to either 1 or 5 minutes of normothermic ischemia showed no significant change in the slope of the diastolic pressure-volume relationship. Hearts exposed to 1 or 5 minutes of normothermic ischemia also had a significant decrease in the peak developed pressure of from 107 ± 6 to 92 ± 2 mm Hg and from 102 ± 3 to 85 ± 4 mm Hg, respectively (p < 0.05). However, ischemic preconditioning brought about a significant improvement in the postischemic peak developed pressure, as opposed to that seen for the control hearts (p < 0.05). Creatine kinase washout was significantly higher in the control hearts only. High-energy phosphate levels, lactate levels, the percentage wet weight, and tissue creatine phosphate levels were not significantly different among the groups. Our findings suggest ischemic preconditioning may be useful in cases with an anticipated prolonged cross-clamp period, if this effect is validated by future investigations.
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