In vitro evaluation of a customized solution for use in attenuating effects of ischemia and reperfusion in the equine small intestine.

This research study examined the capacity of a custom-made solution to decrease the negative effects of low blood flow (ischemia) and subsequent reoxygenation (reperfusion) in the small intestine (jejunum) of a horse, concluding that using the custom solution at a slower flow rate during reperfusion yielded better results.

Research Methodology

• Segments of the small intestine (jejunum) were obtained from 21 healthy adult horses. These were maintained in isolation and subjected to reduced blood flow conditions.
• Arterial blood flow to these segments was reduced to a mere 20% of the normal rate for 40 minutes, simulating the body’s response to shock or severe illness.
• Following this period of ischemia, researchers stimulated reperfusion by reintroducing blood flow for 60 minutes, aiming to mirror the body’s natural recovery process after a period of reduced blood flow.

Application of the Customized Solution

• For one group of horses, the customized solution was administered at a rate of 1 ml/minute during the low-flow ischemia and 3 ml/minute during reperfusion.
• For the second group of horses, the customized solution was provided at the same rate during low-flow ischemia, but the rate was increased to 7 ml/minute during reperfusion.
• A control group of horses was given a lactated Ringer’s solution (a commonly used replacement fluid) at the same rates as the customized solution.

Investigation Variables and Measurements

• Different measurements were taken, including metabolic, hemodynamic (blood pressure and flow), histologic (structural cells and tissues), and permeability variables.

Key Findings

• The group that had a slower flow rate during reperfusion (3 ml/min) had better results than both the control group and the group with the higher flow rate (7 ml/min).
• This result was evident in less histomorphological injury and reduced permeability of the mucosal layer to albumin, suggesting less damage to the intestinal tissue.

Conclusion

The application of a customized solution intravenously at a lower flow rate during the reperfusion phase can effectively shield the equine small intestine from injuries associated with low-flow ischemia and reperfusion.