Heart Energy Metabolism after Intestinal Ischaemia and Reperfusion

G. Stefanutti, Paisarn Vejchapipat, Stephen R. Williams, Agostino Pierro, Simon Eaton

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Background/Purpose: Multiple organ failure subsequent to intestinal ischaemia and reperfusion (I/R) includes cardiac failure, but little is known about heart energy metabolism in this setting. This study investigates the effects of intestinal I/R on heart energy metabolism and evaluates the effects of moderate hypothermia. Methods: Adult rats underwent intestinal ischaemia for 60 minutes followed by 120 minutes of reperfusion. Animals were maintained at either normothermia (36° to 38°C) or moderate hypothermia (30° to 32°C). In experiment A, 2 groups were studied: (1) sham at normothermia; (2) I/R at normothermia. After death, the heart was removed. Cardiac phosphoenergetics were assessed by 31p magnetic resonance spectroscopy; data are expressed as micromoles per gram. In experiment B, 4 groups were studied: (1) sham at normothermia, (2) I/R at normothermia, (3) sham at hypothermia, (4) I/R at hypothermia. At the end of the experiment, the heart was harvested. The activity of carnitine palmitoyl transferase I (CPT I), an important enzyme in the control of fatty acid oxidation, was measured; data are expressed as nanomoles per minute per unit citrate synthase. Results are expressed as mean ± SEM. Results: In experiment A, there were no differences between the 2 study groups in cardiac phosphocreatine, inorganic phosphate, adenosine triphosphate (ATP), or in the ratio of inorganic phosphate to ATP. In experiment B, CPT I activity was decreased significantly after I/R at normothermia compared with normothermic sham, but this enzyme inhibition was prevented by hypothermia (3.9 ± 0.2; v I/R). Conclusions: These results suggest that although cardiac ATP supply was maintained during intestinal I/R at normothermia, the balance of substrate utilisation was shifted from fatty acid oxidation to carbohydrate utilisation. However, moderate hypothermia modified these changes. The beneficial effect of moderate hypothermia on cardiac metabolism during intestinal I/R has potential clinical application in various surgical conditions. © 2004 Elsevier Inc. All rights reserved.
    Original languageEnglish
    Pages (from-to)179-183
    Number of pages4
    JournalJournal of Pediatric Surgery
    Volume39
    Issue number2
    DOIs
    Publication statusPublished - Feb 2004

    Keywords

    • Heat energy metabolism
    • Hypothermia
    • Ischaemia reperfusion injury

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