Indwelling cecal catheters for fluid administration in ponies.

This research explored the effects of two different fluid solutions administered through cecal catheters in six healthy ponies, to understand its impact on various physiological parameters. The researchers concluded that while hydration and electrolyte balance could be maintained using this method, there were related complications.

Experiment Procedure

The study administered two distinct fluid solutions to six healthy ponies through percutaneous cecal catheters. These catheters are small, flexible tubes inserted into the cecum of the ponies, a pouch connected to the junction of the small and large intestines.

• Each pony served as its own control, with changes in physiological parameters observed relative to their initial state.
• The response to each fluid solution was monitored separately, not comparing the effects of one solution to the other.
• The method aimed to understand whether introducing fluids directly into the cecum could effectively maintain hydration and electrolyte balance in ponies.

Observed Effects on Physiological Parameters

The researchers checked the impact on a series of physical and biological parameters including:

• Body weight
• A complete blood count (CBC) to measure different components of the ponies’ blood.
• Packed cell volume (PCV), serving as a measure of the volume percentage of red blood cells in blood.
• Various blood chemistry factors, such as plasma fibrinogen concentration, blood urea nitrogen (BUN), and serum creatinine, Ca, total CO2 (TCO2), Na, Cl, K, and P, used to gauge the ponies’ overall health and organ function.
• Fractional clearance (FC) of Na, Cl, K, and P, a measure of how effectively these electrolytes are removed from the body.

Results and Conclusion

The results indicated that administration of the solutions impacted various physiological parameters:

• During the administration of the first solution, there was a significant increase in the fractional clearance of sodium (FCNa) and chloride (FCCl), whereas the fractional clearance of potassium (FCK) and blood urea nitrogen (BUN) levels reduced significantly.
• With the second solution, there was a significant increase in FCNa and serum phosphorus (P), whereas PCV reduced significantly.
• However, complications arose during the study, including catheter-related problems, diarrhoea, laminitis, and hypocalcemia (low calcium levels in the blood).
• All ponies developed peritonitis, an inflammation of the lining of the abdominal cavity, suggesting the procedure may cause health issues.

In conclusion, while the administration of crystalloid solutions intracecally proved useful in maintaining the ponies’ hydration and electrolyte balance, the procedure was associated with additional complications. Careful consideration may be needed before applying this hydration technique broadly.