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Markers of cellular dysoxia during orthotopic liver transplantation in pigs

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Abstract

Objective: To characterize global, regional, and end-organ markers of cellular dysoxia during orthotopic liver transplantation and early reperfusion in pigs.

Design: Descriptive study.

Setting: University hospital research laboratory.

Animals and interventions: 7 fasted, anesthetized, and mechanically ventilated Yorkshire pigs underwent orthotopic liver transplantation. Oxygen consumption (VO2) and oxygen delivery (DO2) were both calculated using standard formulae. Gastric interstitial pH and the gastroarterial partial pressure of carbondioxide (PCO2) gradient were measured with a gastric tonometer. The following were determined from arterial blood samples: serum lactate to pyruvate ratio, serum 3-hydroxybu-tyrate to acetoacetate ratio, plasma free fatty acids, and plasma free and total carnitine levels.

Measurements and results: Data were collected 1 h after induction of anesthesia (I), at the end of the an-hepatic phase (A), and 1 h after reperfusion (R). Median (range) VO2 values obtained at the specified time points were: I 318 (206–1860), A 210 (152–408), R 330 (214–424) ml/kg per min, respectively (NS); DO2 values were: 11828 (1382–3259), A 1219 (452–2492), R 1741 (1345–12071) ml/kg per min, respectively (NS). The lactate to pyruvate ratio, reflecting the redox potential of the cytosol, progressively increased: I 22 (9–46), A 29 (16–68), R 43 (23–55) (P<0.05). Gastric interstitial pH, as well as the gastroarterial PCO2 gradient values at the specified time points did not reach statistical significance. Levels of ketone bodies (3-hydroxybutyrate+acetoacetate) remained lower than 0.120 mmol/1. The ketone body ratio did not significantly vary over time (NS). Plasma esterified and free carnitine concentrations and free fatty acid values remained within normal limits (NS). Among these markers, the ketone body ratio presented the largest area under the receiver operating characteristic curve as a marker of postoperative mortality, with an inflexion point at 0.9.

Conclusions: In this study, orthotopic liver transplantation was associated with significant variations over time in the redox potential of the cytosol. Postoperative mortality was, however, related to the redox state of the liver mitochondria. Our data suggest the occurrence of abnormal tissue oxygenation during liver transplantation.

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Authors and Affiliations

  1. Division of Critical Care, Ste.-Justine Hospital, University of Montreal, H3T 1C5, Montreal, Canada

    A. de Jaeger, F. Proulx, M. A. Dugas, B. Boeuf & J. Lacroix

  2. Department of Pediatrics and Surgery, Ste.-Justine Hospital, University of Montreal, H3T 1C5, Montreal, Canada

    T. Yandza & A. Manika

  3. Medical Genetics Service, Ste.-Justine Hospital, University of Montreal, H3T1C5, Montreal, Canada

    M. Lambert

Authors
  1. A. de Jaeger
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  2. F. Proulx
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  3. T. Yandza
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  4. M. A. Dugas
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  5. B. Boeuf
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  6. A. Manika
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  7. J. Lacroix
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  8. M. Lambert
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Additional information

This study was made possible by the “Prix SPÉCIA”, granted from the “Société de Réanimation de Langue Française” (F.P.); and through special funding from Fujisawa Laboratories (T. Y.)

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de Jaeger, A., Proulx, F., Yandza, T. et al. Markers of cellular dysoxia during orthotopic liver transplantation in pigs. Intensive Care Med 24, 268–275 (1998). https://doi.org/10.1007/s001340050564

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  • DOI: https://doi.org/10.1007/s001340050564

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