Causes of gastrointestinal colic at an equine referral hospital in South Africa (1998-2007).

The most common causes of gastrointestinal colic at an equine referral hospital in South Africa were determined following retrieval of the medical records of horses admitted during a 10-year study period. The study included 935 horses of which 28% were admitted after hours. Most horses were Thoroughbreds (54%), male (57%), with a mean age of 8.2 years and originated from the Gauteng Province (81%). Heart rate (98%), mucous membrane colour (95%) and auscultation of the abdomen (91%) were the clinical data commonly obtained at admission. Packed cell volume, total serum protein and white cell count were recorded in 78%, 75% and 44% of horses respectively. Transrectal palpation (93%), nasogastric intubation (84%), intravenous catheterisation (74%) and abdominocentesis (53%) were the most frequently performed procedures. Medical intervention was performed in 558 horses (60%). The common causes of medical colic were impactions (39%), tympany (7%) and displacement of the large colon (6%). An exploratory laparotomy was performed in 331 horses (36%). The common causes of surgical colic were displacement (29%), impaction (22%) and small intestinal strangulating lesions (18%). Death occurred in 3% of horses, while euthanasia before medical intervention was performed in 4%. Overall, medical intervention was successful in 93% of horses and 67% in horses managed surgically. In conclusion, 55% of all the equine admissions responded to medical intervention and the recovery rate for horses receiving both medical and surgical intervention was comparable to that reported in other studies.