Investigation of the treatment of sand accumulations in the equine large colon with psyllium and magnesium sulphate.
Authors: Niinistö K E, Ruohoniemi M O, Freccero F, Raekallio M R
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary Sand accumulation in the equine large colon represents a significant clinical challenge, particularly in horses with access to soil or sand-based bedding, and whilst medical management is widely practised, robust evidence supporting specific treatment protocols has been lacking until recently. Researchers in Finland conducted a prospective randomised controlled trial comparing 20 horses treated with nasogastric administration of psyllium and magnesium sulphate (1 g/kg bodyweight each, once daily for four days) against 20 untreated controls, using serial radiography to quantify sand burden before and after the intervention period. Treatment was substantially more effective than no intervention, with significantly greater clearance of accumulated sand demonstrated both radiographically (P<0.001) and in terms of the number of horses achieving complete resolution (P=0.004), though the authors noted unexplained variability in individual responses to the protocol. The practical implication is clear: a four-day course of combined psyllium and magnesium sulphate delivers meaningful sand clearance in subclinical cases, making it a reasonable first-line medical approach before considering more invasive interventions, though clinicians should counsel clients that outcomes cannot be guaranteed for every horse. Environmental management—particularly restricting access to sand and soil—remains essential alongside medical therapy, given the study design explicitly prevented re-exposure during treatment.
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Practical Takeaways
- •Psyllium and magnesium sulphate combination therapy effectively removes large colonic sand in asymptomatic horses; consider as first-line medical management before pursuing more invasive interventions
- •Treatment response is variable between individual horses, so radiographic monitoring during and after therapy is essential to confirm clearance and guide duration of treatment
- •Prevention through eliminating soil access is critical, as untreated control horses (also without soil access) still retained significant sand, suggesting environmental contamination is the primary source
Key Findings
- •Significantly more treated horses cleared sand accumulations compared to untreated controls (P=0.004)
- •Sand clearance was measurable by radiographic area reduction (P<0.001) after 4 days of treatment
- •Treatment comprised 1g/kg bodyweight psyllium plus 1g/kg bodyweight magnesium sulphate daily for 4 days via nasogastric intubation
- •Individual variation in sand clearance response was observed despite statistically significant group differences