Effect of Methylene Blue on the Hemodynamic Instability Resulting From Liver Ischemia and Reperfusion in Rabbits

• Published in: Transplantation proceedings Vol. 43; no. 10; pp. 3643 - 3651
• Main Authors: Rosique, R.G, Rosique, M.J.F, Rosique, I.A, Tirapelli, L.F, Castro e Silva, O, dos Santos, J.S, Evora, P.R.B
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01-12-2011; Elsevier
• Subjects: Animals; Biological and medical sciences; Biomarkers - blood; Blood Gas Analysis; Cardiovascular Agents - pharmacology; Disease Models, Animal; Fundamental and applied biological sciences. Psychology; Fundamental immunology; Gastroenterology. Liver. Pancreas. Abdomen; Hemodynamics - drug effects; Liver - blood supply; Liver - drug effects; Liver - pathology; Liver Circulation - drug effects; Liver. Biliary tract. Portal circulation. Exocrine pancreas; Male; Medical sciences; Methylene Blue - pharmacology; Other diseases. Semiology; Primary Graft Dysfunction - blood; Primary Graft Dysfunction - drug therapy; Primary Graft Dysfunction - pathology; Primary Graft Dysfunction - physiopathology; Rabbits; Reperfusion Injury - blood; Reperfusion Injury - drug therapy; Reperfusion Injury - pathology; Reperfusion Injury - physiopathology; Surgery; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Time Factors; Tissue, organ and graft immunology; Ischemia reperfusion; Rabbit; Cardiovascular disease; Hepatic disease; Transplantation; Lagomorpha; Methylene blue; Vascular disease; Medicine; Vertebrata; Mammalia; Reperfusion; Treatment; Surgery; Animal; Digestive diseases; Graft; Instability; Hemodynamics; Liver ischemia
• DOI: 10.1016/j.transproceed.2011.08.108
• EISSN: 1873-2623
• ISSN: 0041-1345

Abstract The experimental investigation was performed to study the effects of methylene blue (MB) on hemodynamic, biochemical, and tissue changes among rabbits undergoing liver ischemia and reperfusion (IR). Twenty-four rabbits were randomized into 5 groups: 1, SHAM, control; 2, MB infusion bolus (3 mg/kg); 3, IR, hepatic ischemia for 60 minutes followed by 120 minutes of reperfusion; 4, MB-R, undergoing ischemia that had received an MB bolus infusion (3 mg/kg) prior to reperfusion; 5, R-MB, undergoing ischemia and MB bolus infusion after hemodynamic instability caused by reperfusion. The analysis included continuous recording of vital signs. Blood samples were collected at 0, 60, and 180 minutes of IR to determine blood gases as well as biochemical markers of liver function, nitric oxide, lipid peroxidation, and neutrophil activity. At the end of each experiment, liver tissue samples were collected for histological evaluation of parenchymae markers. Statistical analysis used two-way analysis of variance (ANOVA) tests with significance set at P < .05. Vital signs significantly improved with MB infusion, irrespective of whether it was applied before or after reperfusion. Blood gas data revealed different patterns among the SHAM, MB, IR, MB-R, and R-MB groups, without statistical significance, except for favorable lactate results in the R-MB group ( P < .01), which displayed greater survival. Biochemical tests did not show significant differences among the groups, whereas histological analysis revealed favorable appearances for the MB-R and R-MB groups. The MB effect lasted long after reperfusion, suggesting that improvement in the hemodynamic parameters was not based on liver integrity, but rather was possibly related to endothelial function.