title: Partial hepatectomy hemodynamics changes: Experimental data explained by closed-loop lumped modeling.
abstract: The liver function may be degraded after partial liver ablation surgery. Adverse liver hemodynamics have been shown to be associated to liver failure. The link between these hemodynamics changes and ablation size is however poorly understood. This article proposes to explain with a closed-loop lumped model the hemodynamics changes observed during twelve surgeries in pigs. The portal venous tree is modeled with a pressure-dependent variable resistor. The variables measured, before liver ablation, are used to tune the model parameters. Then, the liver partial ablation is simulated with the model and the simulated pressures and flows are compared with post-operative measurements. Fluid infusion and blood losses occur during the surgery. The closed-loop model presented accounts for these blood volume changes. Moreover, the impact of blood volume changes and the liver lobe mass estimations on the simulated variables is studied. The typical increase of portal pressure, increase of liver pressure loss, slight decrease of portal flow and major decrease in arterial flow are quantitatively captured by the model for a 75% hepatectomy. It appears that the 75% decrease in hepatic arterial flow can be explained by the resistance increase induced by the surgery, and that no hepatic arterial buffer response (HABR) mechanism is needed to account for this change. The different post-operative states, observed in experiments, are reproduced with the proposed model. Thus, an explanation for inter-subjects post-operative variability is proposed. The presented framework can easily be adapted to other species circulations and to different pathologies for clinical hepatic applications.
authors.affiliation: Inria, Paris, France; Sorbonne Universités UPMC Univ Paris 6, Laboratoire Jacques-Louis Lions, France.
authors.forename: Chloe
authors.initials: C
authors.lastname: Audebert
authors.affiliation: Inserm Unité 1193, Villejuif, France.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bekheit
authors.affiliation: Inserm Unité 1193, Villejuif, France; CHRU, hôpitaux de Tours,Chirurgie Hépato-biliaire et Pancréatique, Transplantation Hépatique, Tours, France.
authors.forename: Petru
authors.initials: P
authors.lastname: Bucur
authors.affiliation: Inserm Unité 1193, Villejuif, France; AP-HP, Hôpital Paul Brousse, Centre Hépato-Biliaire, Villejuif, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Vibert
authors.affiliation: Inria, Paris, France; Sorbonne Universités UPMC Univ Paris 6, Laboratoire Jacques-Louis Lions, France. Electronic address: irene.vignon-clementel@inria.fr.
authors.forename: Irene E
authors.initials: IE
authors.lastname: Vignon-Clementel
mesh_terms: D000818:Animals; D006439:Hemodynamics; D006498:Hepatectomy; D006499:Hepatic Artery / Q000502:physiology; D008099:Liver / Q000502:physiology; D008102:Liver Circulation / Q000502:physiology*; D008955:Models, Cardiovascular; D011169:Portal Vein / Q000502:physiology; D013552:Swine
keywords: Closed-loop lumped model; Hemodynamics; Hepatectomy; Surgery simulation; Swine; Validation