Denervation atrophy in three horses with fibrotic myopathy.

This paper investigates a neurological disease called denervation atrophy in three horses dealing with a muscle disorder called fibrotic myopathy. The researchers find correlation between peripheral neuropathy and fibrotic myopathy.

Neuromuscular Disease Examination

• Three horses suspected to suffer from fibrotic myopathy, a muscle tissue disorder, were studied for the presence of neuromuscular diseases.
• In two out of three horses, the researchers ran a procedure called concentric needle electromyography. This process involves inserting an electrode into the muscle to record the electric activity of the muscles and nerves.
• One of those two horses showed intense spontaneous activity indicative of denervation – loss of nerve supply – in multiple thigh muscles.
• All three horses had to be euthanatized for further examination.

Histochemical and Histological Examinations

• Post euthanizing, tissue specimens were collected from the horses for histological and histochemical analysis. These techniques reveal the microscopic structural details of the tissue and the chemical processes happening within.
• Results showed that all three horses had degenerative lesions in peripheral and intramuscular nerves, suggesting complications beyond just fibrotic myopathy.
• Moreover, they found angular atrophy in both type-1 and type-2 muscle fibers on all three horses. Angular atrophy, a known indicator of denervation atrophy, is when a fiber angle shrinks due to nerve supply loss.

Cause of Peripheral Neuropathy

• One out of three horses was detected with a fracture in the greater trochanter (part of hip bone) that was entrapping the sciatic nerve. This was potentially causing the peripheral neuropathy and other symptoms related to fibrotic myopathy in this particular horse.
• However, the cause of peripheral neuropathy, a disease resulting from damage to peripheral nerves, was not determined in the other two horses.
• From these observations, the researchers concluded that peripheral neuropathy should be a consideration when treating horses with fibrotic myopathy.