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Equine Practice
Equine grass sickness
  1. Catriona Lyle

    Catriona Lyle graduated from Edinburgh in 2004. She spent three years in mixed practice in South Africa and Scotland before returning to Edinburgh, where she is currently the Horserace Betting Levy Board senior clinical scholar in equine internal medicine and cardiology.

  2. Scott Pirie

    Scott Pirie graduated from Edinburgh in 1989. After two years in equine practice, he returned to Edinburgh, where he is currently head of the equine medicine unit. He holds RCVS certificates in equine practice and equine internal medicine, and a PhD for studies on equine allergic airway disease. His research work includes a three‐year study into equine grass sickness. He is a diplomate of the European College of Equine Internal Medicine.


EQUINE grass sickness (dysautonomia) is a neurological disease associated primarily with degeneration of neurons in the autonomic nervous system (including the enteric nervous system), although involvement of the somatic nervous system has also been widely reported. It affects all Equidae, is usually fatal and has an approximate incidence of 1 per cent in some parts of the UK. This article discusses the clinical aspects of the disease and summarises the findings of recent research into the aetiology and epidemiology of the condition.

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