Recovery of horses from dysautonomia (grass sickness).

The research reviews long-term recovery of horses suffering from chronic dysautonomia, a condition also known as grass sickness. Specific attention was given to a group of affected horses that were treated at the Royal (Dick) School of Veterinary Studies from 1991 to 1994.

Research Context and Methodology

• The research is based on the cases of chronic dysautonomia (commonly known as grass sickness) seen at the Royal (Dick) School of Veterinary Studies between the years 1991 and 1994. Dysautonomia is a serious condition affecting horses, causing digestive issues due to damage in the nervous system regulating involuntary processes.
• From the 82 chronic cases during these years, 35 horses were kept in the veterinary hospital for treatment and were later returned to their owners. The remaining 47 horses had to be euthanized during their hospital stay due to the severity of the disease.

Results of the Study

• Out of the 35 horses that were released back to their owners, four died and 27 were available for follow-up. Follow-up data for the remaining four horses is not included in the study.
• The follow-up showed that 12 horses were participating in competitive events, while six others were being trained for upcoming competitions. This implies a recovery level that allows the horse to sustain the requirements of competitive equestrian activities.
• The research noted that it typically takes at least a year to determine whether a horse suffering from dysautonomia can return to successful competing. The study, however, confirms that all the surviving horses were capable of being ridden, suggesting a substantial level of recovery.

Long-Term Effects and Observations

• Despite the recovery and return to normal activity, some of the horses demonstrated long-term side effects such as excessive sweating, difficulty swallowing certain types of food, and changes in coat appearance, continuing after the horses had regained normal weight.
• These symptoms indicate that while survival and return to competitive activity are possible after chronic dysautonomia, there may still be lasting effects from the disease that warrant further research and understanding.