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                                     ATYPICAL MYOPATHY

              Or Seasonal Pasture Myopathy (Most likely to occour in the winter, or early summer )

 

Symptoms
- Sudden Weakness and Stiffness
- Horse found laying Down  (or dead)
- Difficulty to get up
- Dark coloured urine (Due to the Kidneys breaking down) (Myoglobinuria )
- Stiffness
- Red or purple mucus membranes
- Depressed
- Muscle tremors
- Difficulty to stay standing
- Difficulty or inability to walk
- Increased heart rate
- Difficulty to breath
- Sweating / intense pain
- Hypothermia
- Colic
- Low Head Carriage

Death may Occour within 6 to 70 hours in 85% of Horses. (Most cases still alive after 5 days are likely to recover)

It is often the Urine of the animal that will give the diagnosis,  Urinary dipsticks will reveal Myoglobinuria, If the urine is not obviously dark coluored, or the presence of  Glucose.

Very young OR older Equines with poor body condition are more susceptible

Cause

Hypoglycin A

In the Autumn Seeds that fall off of the Sycamore tree known as ‘helicopters’ contain the toxin that is thought  responsible for causing atypical myopathy.                                    

 

 The concentration of hypoglycin A   in Sycamore and Maple family tree seeds (varies between seeds in the same pasture and even from the same tree.

 

It is likely that the most important factors contributing to horses being poisoned by hypoglycin A are the availability of the seed in the field combined with a lack of adequate grazing or supplementary forage.

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Treatment

As yet not much can be done, and supportive treatment could include rehydration, analgesia, intranasal oxygen to help breathing and multivitamin administration. (ie; Intense vetinary care) 

 

 

 

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