Trauma- and sepsis-induced hepatic ischemia and reperfusion injury

Role of angiotensin II

T. Tadros, D. L. Traber, David Herndon

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Hypothesis: We hypothesized that angiotensin II, a potent vasoconstrictor, is involved in the occurrence of hepatic ischemia after burn and sepsis, and that administration of angiotensin II antagonist DuP753 would ameliorate this process. Design: Randomized animal study. Setting: University laboratory, investigational intensive care unit, University of Texas Medical Branch, Galveston. Materials: Female pigs (n = 18, weighing 20-25 kg). Interventions: All animals were prepared with ultrasonic flow probes on the portal vein and the common hepatic artery. Catheters were inserted in the superior mesenteric and left hepatic veins. After 5 days all animals were anesthetized and 12 of them received 40% total body surface area third-degree burn. Escherichia coli lipopolysaccharide (100 μg/kg) was intravenously administered at 18 hours postburn DuP753 was administered intravenously in a dose of 1 μg/kg to 6 pigs immediately after the burn. All animals were studied for 42 hours. Main Outcome Measures: Systemic and hepatic hemodynamics were measured and blood samples were drawn for determinations of arterial, mixed venous, and portal blood gases at baseline and at 14 consecutive time points, starting 1 hour after the burn. Results: Burn caused a 4.6-fold increase in hepatic arterial vascular resistance and a 49% decrease in hepatic arterial blood flow. Postburn administration of angiotensin II receptor blocker DuP753 yielded a significant improvement in the hepatic arterial hemodynamics (only 12% increase in hepatic arterial vascular resistance and 8% decrease in hepatic arterial blood flow, P<.05 vs nontreated group, analysis of variance [ANOVA]). Postlipopolysaccharide hepatic arterial blood flow was significantly reduced (12% of baseline, P<.05, ANOVA), in contrast to DuP753-treated animals (64% of baseline, P<.05 vs nontreated group, ANOVA). Postburn blocking of angiotensin II receptors yielded a significant improvement in postlipopolysaccharide portal venous blood flow (85% of baseline vs 48% of baseline in nontreated animals, P<.05, ANOVA). Postburn endotoxemia resulted in a significant decrease of hepatic oxygen delivery (22% of baseline) and hepatic oxygen consumption (30% of baseline), while no marked changes were observed in the DuP753-treated group (P<.05 vs nontreated group, ANOVA). Conclusions: Angiotensin II seems to play a pivotal role in burn- and sepsis-induced hepatic ischemia and reperfusion injury. Blocking angiotensin II receptors by DuP753 seems to abrogate this adverse effect of thermal injuries and sepsis on hepatic perfusion and oxygenation.

Original languageEnglish (US)
Pages (from-to)766-772
Number of pages7
JournalArchives of Surgery
Volume135
Issue number7
StatePublished - 2000
Externally publishedYes

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Reperfusion Injury
Angiotensin II
Sepsis
Liver
Wounds and Injuries
Analysis of Variance
Angiotensin Receptors
Vascular Resistance
Swine
Hemodynamics
Endotoxemia
Hepatic Veins
Angiotensin Receptor Antagonists
Body Surface Area
Hepatic Artery
Vasoconstrictor Agents
Portal Vein
Burns
Ultrasonics
Oxygen Consumption

ASJC Scopus subject areas

  • Surgery

Cite this

Trauma- and sepsis-induced hepatic ischemia and reperfusion injury : Role of angiotensin II. / Tadros, T.; Traber, D. L.; Herndon, David.

In: Archives of Surgery, Vol. 135, No. 7, 2000, p. 766-772.

Research output: Contribution to journalArticle

Tadros, T, Traber, DL & Herndon, D 2000, 'Trauma- and sepsis-induced hepatic ischemia and reperfusion injury: Role of angiotensin II', Archives of Surgery, vol. 135, no. 7, pp. 766-772.
Tadros, T. ; Traber, D. L. ; Herndon, David. / Trauma- and sepsis-induced hepatic ischemia and reperfusion injury : Role of angiotensin II. In: Archives of Surgery. 2000 ; Vol. 135, No. 7. pp. 766-772.
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abstract = "Hypothesis: We hypothesized that angiotensin II, a potent vasoconstrictor, is involved in the occurrence of hepatic ischemia after burn and sepsis, and that administration of angiotensin II antagonist DuP753 would ameliorate this process. Design: Randomized animal study. Setting: University laboratory, investigational intensive care unit, University of Texas Medical Branch, Galveston. Materials: Female pigs (n = 18, weighing 20-25 kg). Interventions: All animals were prepared with ultrasonic flow probes on the portal vein and the common hepatic artery. Catheters were inserted in the superior mesenteric and left hepatic veins. After 5 days all animals were anesthetized and 12 of them received 40{\%} total body surface area third-degree burn. Escherichia coli lipopolysaccharide (100 μg/kg) was intravenously administered at 18 hours postburn DuP753 was administered intravenously in a dose of 1 μg/kg to 6 pigs immediately after the burn. All animals were studied for 42 hours. Main Outcome Measures: Systemic and hepatic hemodynamics were measured and blood samples were drawn for determinations of arterial, mixed venous, and portal blood gases at baseline and at 14 consecutive time points, starting 1 hour after the burn. Results: Burn caused a 4.6-fold increase in hepatic arterial vascular resistance and a 49{\%} decrease in hepatic arterial blood flow. Postburn administration of angiotensin II receptor blocker DuP753 yielded a significant improvement in the hepatic arterial hemodynamics (only 12{\%} increase in hepatic arterial vascular resistance and 8{\%} decrease in hepatic arterial blood flow, P<.05 vs nontreated group, analysis of variance [ANOVA]). Postlipopolysaccharide hepatic arterial blood flow was significantly reduced (12{\%} of baseline, P<.05, ANOVA), in contrast to DuP753-treated animals (64{\%} of baseline, P<.05 vs nontreated group, ANOVA). Postburn blocking of angiotensin II receptors yielded a significant improvement in postlipopolysaccharide portal venous blood flow (85{\%} of baseline vs 48{\%} of baseline in nontreated animals, P<.05, ANOVA). Postburn endotoxemia resulted in a significant decrease of hepatic oxygen delivery (22{\%} of baseline) and hepatic oxygen consumption (30{\%} of baseline), while no marked changes were observed in the DuP753-treated group (P<.05 vs nontreated group, ANOVA). Conclusions: Angiotensin II seems to play a pivotal role in burn- and sepsis-induced hepatic ischemia and reperfusion injury. Blocking angiotensin II receptors by DuP753 seems to abrogate this adverse effect of thermal injuries and sepsis on hepatic perfusion and oxygenation.",
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AU - Traber, D. L.

AU - Herndon, David

PY - 2000

Y1 - 2000

N2 - Hypothesis: We hypothesized that angiotensin II, a potent vasoconstrictor, is involved in the occurrence of hepatic ischemia after burn and sepsis, and that administration of angiotensin II antagonist DuP753 would ameliorate this process. Design: Randomized animal study. Setting: University laboratory, investigational intensive care unit, University of Texas Medical Branch, Galveston. Materials: Female pigs (n = 18, weighing 20-25 kg). Interventions: All animals were prepared with ultrasonic flow probes on the portal vein and the common hepatic artery. Catheters were inserted in the superior mesenteric and left hepatic veins. After 5 days all animals were anesthetized and 12 of them received 40% total body surface area third-degree burn. Escherichia coli lipopolysaccharide (100 μg/kg) was intravenously administered at 18 hours postburn DuP753 was administered intravenously in a dose of 1 μg/kg to 6 pigs immediately after the burn. All animals were studied for 42 hours. Main Outcome Measures: Systemic and hepatic hemodynamics were measured and blood samples were drawn for determinations of arterial, mixed venous, and portal blood gases at baseline and at 14 consecutive time points, starting 1 hour after the burn. Results: Burn caused a 4.6-fold increase in hepatic arterial vascular resistance and a 49% decrease in hepatic arterial blood flow. Postburn administration of angiotensin II receptor blocker DuP753 yielded a significant improvement in the hepatic arterial hemodynamics (only 12% increase in hepatic arterial vascular resistance and 8% decrease in hepatic arterial blood flow, P<.05 vs nontreated group, analysis of variance [ANOVA]). Postlipopolysaccharide hepatic arterial blood flow was significantly reduced (12% of baseline, P<.05, ANOVA), in contrast to DuP753-treated animals (64% of baseline, P<.05 vs nontreated group, ANOVA). Postburn blocking of angiotensin II receptors yielded a significant improvement in postlipopolysaccharide portal venous blood flow (85% of baseline vs 48% of baseline in nontreated animals, P<.05, ANOVA). Postburn endotoxemia resulted in a significant decrease of hepatic oxygen delivery (22% of baseline) and hepatic oxygen consumption (30% of baseline), while no marked changes were observed in the DuP753-treated group (P<.05 vs nontreated group, ANOVA). Conclusions: Angiotensin II seems to play a pivotal role in burn- and sepsis-induced hepatic ischemia and reperfusion injury. Blocking angiotensin II receptors by DuP753 seems to abrogate this adverse effect of thermal injuries and sepsis on hepatic perfusion and oxygenation.

AB - Hypothesis: We hypothesized that angiotensin II, a potent vasoconstrictor, is involved in the occurrence of hepatic ischemia after burn and sepsis, and that administration of angiotensin II antagonist DuP753 would ameliorate this process. Design: Randomized animal study. Setting: University laboratory, investigational intensive care unit, University of Texas Medical Branch, Galveston. Materials: Female pigs (n = 18, weighing 20-25 kg). Interventions: All animals were prepared with ultrasonic flow probes on the portal vein and the common hepatic artery. Catheters were inserted in the superior mesenteric and left hepatic veins. After 5 days all animals were anesthetized and 12 of them received 40% total body surface area third-degree burn. Escherichia coli lipopolysaccharide (100 μg/kg) was intravenously administered at 18 hours postburn DuP753 was administered intravenously in a dose of 1 μg/kg to 6 pigs immediately after the burn. All animals were studied for 42 hours. Main Outcome Measures: Systemic and hepatic hemodynamics were measured and blood samples were drawn for determinations of arterial, mixed venous, and portal blood gases at baseline and at 14 consecutive time points, starting 1 hour after the burn. Results: Burn caused a 4.6-fold increase in hepatic arterial vascular resistance and a 49% decrease in hepatic arterial blood flow. Postburn administration of angiotensin II receptor blocker DuP753 yielded a significant improvement in the hepatic arterial hemodynamics (only 12% increase in hepatic arterial vascular resistance and 8% decrease in hepatic arterial blood flow, P<.05 vs nontreated group, analysis of variance [ANOVA]). Postlipopolysaccharide hepatic arterial blood flow was significantly reduced (12% of baseline, P<.05, ANOVA), in contrast to DuP753-treated animals (64% of baseline, P<.05 vs nontreated group, ANOVA). Postburn blocking of angiotensin II receptors yielded a significant improvement in postlipopolysaccharide portal venous blood flow (85% of baseline vs 48% of baseline in nontreated animals, P<.05, ANOVA). Postburn endotoxemia resulted in a significant decrease of hepatic oxygen delivery (22% of baseline) and hepatic oxygen consumption (30% of baseline), while no marked changes were observed in the DuP753-treated group (P<.05 vs nontreated group, ANOVA). Conclusions: Angiotensin II seems to play a pivotal role in burn- and sepsis-induced hepatic ischemia and reperfusion injury. Blocking angiotensin II receptors by DuP753 seems to abrogate this adverse effect of thermal injuries and sepsis on hepatic perfusion and oxygenation.

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