Lactate levels in bowel strangulation with experimental animal model

Area of Science:

• Surgical Research
• Biomedical Engineering
• Animal Models

Background:

• Bowel strangulation is a common surgical emergency.
• Blood lactate concentration is a known predictive marker for critical illness.
• The temporal dynamics of lactate changes in bowel strangulation are not well understood.

Purpose of the Study:

• To investigate the progressive changes in blood lactate levels following induced bowel strangulation in a mouse model.
• To determine the time course of lactate elevation and pH changes after mesenteric artery and vein ligation.
• To establish a novel animal model for studying bowel strangulation pathophysiology.

Main Methods:

• Thirty-six mice were randomly assigned to six groups (0, 8, 16, 24, 48, 72 hours post-operation).
• Bowel strangulation was induced by ligating a segment of the terminal ileum and its vasculature.
• Arterial blood was collected for lactate concentration and pH measurement using a blood gas analyzer.

Main Results:

• A significant increase in lactate concentration and a significant decrease in pH were observed by 8 hours post-strangulation (P < 0.05).
• Elevated lactate levels persisted from 8 to 72 hours after the operation.
• The study identified an 8-hour time lag between the induction of strangulation and the marked increase in lactate.

Conclusions:

• This study is the first to report a mouse model of bowel strangulation.
• Blood lactate increases significantly 8 hours after bowel strangulation, suggesting it as an early indicator.
• The established animal model provides a platform for identifying more specific biomarkers for bowel strangulation.