Effects of heparin treatment on colonic torsion-associated hemodynamic and plasma eicosanoid changes in anesthetized ponies.

The research seeks to study the effect of a drug named sodium heparin on horses dealing with a fatal condition known as large colon torsion. The study performs this using a control group as well as a group using the medication, assessing parameters such as systemic arterial pressure and plasma eicosanoid concentrations.

Methodology

• The study was carried out on 20 anesthetized ponies which were divided into four groups: control; control/heparin; torsion; torsion/heparin. The splitting into four groups helped in creating a more comprehensive comparison, with and without the presence of the condition (colon torsion), and with and without the heparin treatment.
• The colon torsion was artificially induced in the relevant groups through a 720-degree rotation of cecum and colon.
• A period of torsion and reperfusion (the restoration of blood flow) was allowed for each of the torsion groups. The reperfusion time was one hour, during which the ‘torsion/heparin’ group received an administration of heparin thirty minutes into the experiment
• The data collected from the experiment was then analyzed, with parametric data being evaluated via a split-plot analysis of variance and histopathologic data being analyzed with a Kruskal-Wallis one-way analysis of variance by ranks.

Findings

• It was found that the administration of heparin was effective in preventing hypotension (low blood pressure) that is typically induced by correcting colon torsion. The drug also prevented an increase in vascular resistance and thromboxane concentration.
• Heparin was successful in significantly increasing the blood flow in the colon for up to 40 minutes during the reperfusion process.
• The study also found that heparin did not have an effect on the concentration of prostacyclin, a hormone-like compound that inhibits platelet aggregation and is often used as a vasodilator.
• Additionally, heparin didn’t affect the large colon’s histologic appearance (the microscopic structure of tissue).

Conclusions

The study’s findings suggest that sodium heparin could be effective in treating large colon torsion in horses, at least in terms of managing some of the condition’s symptoms like hypotension, vascular resistance, and thromboxane concentration. These findings could potentially be important for further research and treatment of colon torsion in horses and possibly other species.