Ischemic preconditioning-induced hyperperfusion correlates with hepatoprotection after liver resection.
OBJECTIVE
To characterize the impact of the Pringle maneuver (PM) and ischemic preconditioning (IP) on total blood supply to the liver following hepatectomies.


METHODS
Sixty one consecutive patients who underwent hepatic resection under inflow occlusion were randomized either to receive PM alone (n = 31) or IP (10 min of ischemia followed by 10 min of reperfusion) prior to PM (n = 30). Quantification of liver perfusion was measured by Doppler probes at the hepatic artery and portal vein at various time points after reperfusion of remnant livers.


RESULTS
Occlusion times of 33 +/- 12 min (mean +/- SD) and 34 +/- 14 min and the extent of resected liver tissue (2.7 segments) were similar in both groups. In controls (PM), on reperfusion of liver remnants for 15 min, portal perfusion markedly decreased by 29% while there was a slight increase of 8% in the arterial blood flow. In contrast, following IP + PM the portal vein flow remained unchanged during reperfusion and a significantly increased arterial blood flow (+56% vs baseline) was observed. In accordance with a better postischemic blood supply of the liver, hepatocellular injury, as measured by alanine aminotransferase (ALT) levels on day 1 was considerably lower in group B compared to group A (247 +/- 210 U/I vs 550 +/- 650 U/I, P < 0.05). Additionally, ALT levels were significantly correlated to the hepatic artery inflow.


CONCLUSIONS
IP prevents postischemic flow reduction of the portal vein and simultaneously increases arterial perfusion, suggesting that improved hepatic macrocirculation is a protective mechanism following hepatectomy.
Heizmann
Oleg
O
Department of Surgery, University Hospital Basel, CH-4031 Basel, Switzerland. oheizmann@uhbs.ch
Meimarakis
Georgios
G
Volk
Andreas
A
Matz
Daniel
D
Oertli
Daniel
D
Schauer
Rolf J
RJ
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001158:Arteries / Q000473:pathology; D005260:Female; D006801:Humans; D019194:Ischemic Preconditioning / Q000379:methods*; D008099:Liver / Q000473:pathology* / Q000601:surgery*; D008107:Liver Diseases / Q000601:surgery; D008297:Male; D008833:Microcirculation; D008875:Middle Aged; D010477:Perfusion; D016016:Proportional Hazards Models; D013997:Time Factors
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