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Comparison of Vasodilators in Dual Vessel Normothermic Ex Vivo Liver Machine Perfusion of Rat Liver Grafts

J. M. Gassner, F. Strobl, J. Michelotto, K. Kristina, V. Muth, M. Zimmer, L. Gilles, S. Moosburner, J. Pratschke, I. Sauer, N. Raschzok

Department of Surgery, Experimental Surgery, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany

Meeting: 2022 American Transplant Congress

Abstract number: 943

Keywords: Hepatic artery, Liver, Machine preservation, Rat

Topic: Basic Science » Basic Science » 15 - Machine Perfusion and Organ Rehabililtation - Basic

Session Information

Session Name: Machine Perfusion and Organ Rehabilitation - Basic

Session Type: Poster Abstract

Date: Sunday, June 5, 2022

Session Time: 7:00pm-8:00pm

 Presentation Time: 7:00pm-8:00pm

Location: Hynes Halls C & D

*Purpose: Small animal models of normothermic ex vivo liver machine perfusion (NEVLP) comparable to clinically used protocols are vital to perform translational studies on organ rehabilitation by NEVLP.

*Methods: 12 male Sprague-Dawley rat livers were perfused via the portal vein as well as the hepatic artery using a custom-built small animal perfusion circuit with integrated dialysis circuit for 6 hours. The composition of the erythrocyte-supplemented perfusate and vasodilators were adapted to clinical protocols of NEVLP. Continuous epoprostenol infusion was compared to on demand administration of either verapamil or metamizole with respect to arterial pressure control and perfusion outcome.

*Results: Arterial pressure was maintained best with on demand bolus application with metamizole and Verapamil (Part at 6h: 94.6 vs. 82.9 mmHg, respectively; p=0.58), while epoprostenol led to escalating arterial pressures in 50% of experiments. All experiments showed initial lactate clearance (LactateT0h: 2,98mmol/L ±0,74 SD) with levels slightly increasing after 2h. Epoprostenol resulted in the highest endpoint lactate (2.22 mmol/L ± 1.12 SD). Bile production was greatest with metamizole in total, especially shown within the last hour of perfusion (Bile5h-6h: 1366mg vs. 571mg and 401mg; p<0.001). Repeated administration of metamizole in the second half led to a decrease in bile pH (pHT6: 7.90 ± 0.13). ALT release over the course of the perfusion was lowest with Verapamil compared to metamizole and epoprostenol (86.5 U/L ± 34.2 SD; 137.7 U/L ± 68.0 SD; 153.8 U/L ± 55.9 SD, respectively).

*Conclusions: D. Higher doses of epoprostenol had to be used in our rat NEVLP compared to clinical protocols. It also appears to have a negative effect on lactate clearance by influencing hepatic metabolism. Metamizole shows good results but is not generally approved for clinical use. Verapamil combines high vasodilative efficiency and optimal perfusion outcome in rat liver grafts and thus should be evaluated in transplantation studies after 6 hours of NEVLP.

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To cite this abstract in AMA style:

Gassner JM, Strobl F, Michelotto J, Kristina K, Muth V, Zimmer M, Gilles L, Moosburner S, Pratschke J, Sauer I, Raschzok N. Comparison of Vasodilators in Dual Vessel Normothermic Ex Vivo Liver Machine Perfusion of Rat Liver Grafts [abstract]. Am J Transplant. 2022; 22 (suppl 3). https://atcmeetingabstracts.com/abstract/comparison-of-vasodilators-in-dual-vessel-normothermic-ex-vivo-liver-machine-perfusion-of-rat-liver-grafts/. Accessed May 9, 2025.

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