The effect of diuretics on the faecal excretion of water and electrolytes in horses.

This research study examines the impact of diuretics on the excretion of water and electrolytes in horses, finding that specific medicines can significantly influence the body’s chemical balance and bowel movement timings.

Objective and Sample

• The study was designed to measure the effects of two diuretics, frusemide and hydrochlorothiazide, on the plasma, urinary, and faecal electrolytes in ponies. The average weight of the ponies involved in the study was 180 kg.

Changes in Electrolyte Levels

• The researchers found that a rapid loss of substantial amounts of sodium in urine did not significantly influence the plasma sodium concentration. The implication is that the body can maintain stable blood sodium levels despite high urinary losses.
• The diuretic frusemide was observed to substantially increase faecal (stool) sodium excretion, indicating its role in promoting sodium removal from the body.
• The same medication was also found to increase faecal potassium levels in the 48 hours following administration. This increase was coupled with a production of hypokalaemia, a condition characterized by low blood potassium levels.

Effects on Faecal Water, Chloride, and Intestinal Transit Time

• Frusemide also increased the amount of water in the faeces in the 24/48-hour period after administration. This could potentially enhance stool volume and moisture, or it could lead to dehydration if not adequately managed.
• On the other hand, the diuretic hydrochlorothiazide was found to increase faecal chloride levels in the 24 hours following administration, likely contributing to the excretion of this electrolyte.
• The study also noted that frusemide extended the intestinal transit time of both liquid and particulate markers. This suggests that the medicine could slow down the passage of substances through the intestinal tract, which might affect nutrient absorption or other physiological processes.