Equissage Therapy: Enhancing Comfort and Care for Horses with Cushing’s Disease
Understanding Cushing's Disease in Horses
Equine Cushing's disease, also known as Pars Pituitary Intermedia Dysfunction (PPID), is a hormonal disorder primarily affecting older horses, especially ponies. Horses over the age of 15 are most at risk, though larger breeds can also be affected. The condition arises from an enlargement of the pars intermedia, the middle section of the pituitary gland, located at the base of the brain.
This enlargement leads to excessive production of hormones, particularly adrenocorticotropic hormone (ACTH), which stimulates the adrenal glands to release cortisol. Elevated cortisol levels cause a range of clinical signs, including:
- Recurrent, unexplained laminitis.
- An abnormal, often long and wavy, hair coat (hirsutism).
- Increased drinking and urination.
- Ravenous appetite.
- Lethargy and muscle wasting.
- Pot-bellied appearance and fat deposits above the eyes.
- Reduced immunity, leading to recurrent infections and susceptibility to parasites.
The link between PPID and laminitis is still under investigation, but elevated cortisol and insulin resistance are believed to play significant roles.
Current recommended management & treatment:
Diagnosis typically involves clinical examination and blood tests, with the most common being the measurement of resting ACTH levels. A more specific test, the Low Dose Dexamethasone Suppression Test, assesses cortisol response to dexamethasone, identifying cases where cortisol levels remain elevated.
While there is no cure for PPID, its symptoms can be managed through:
- Medication: Pergolide, a dopamine agonist, is the most effective treatment, reducing hormone production and alleviating symptoms in up to 80% of cases.
- Regular Monitoring and Care:
- Frequent checks for wounds or infections due to reduced immunity.
- Routine farrier visits, dental care, vaccinations, and faecal egg counts.
- Clipping long hair during warmer months to enhance comfort.
- Dietary Management: Appropriate feeding to support metabolic health and prevent laminitis.
