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Maple and pistachio plants can cause acute hemolysis in horses due to bacterial metabolism of gallic acids into pyrogallol. Prognosis is poor, but survival past six days indicates expected recovery.

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Area of Science:

  • Veterinary Medicine
  • Toxicology
  • Equine Health

Background:

  • Certain plants, including maple (Acer) and pistachio (Pistacia) genera, are implicated in causing acute hemolytic crises in horses.
  • The suspected mechanism involves the metabolism of gallic acids by equine enteric bacteria into the potent oxidant pyrogallol.

Purpose of the Study:

  • To elucidate the cause and understand the clinical implications of plant-induced acute hemolysis in horses.
  • To review diagnostic challenges and therapeutic strategies for this condition.

Main Methods:

  • This review synthesizes existing literature on plant-induced hemolysis in horses.
  • Focuses on the proposed metabolic pathway involving gallic acids and pyrogallol.
  • Examines diagnostic criteria, treatment protocols, and prognostic factors.

Main Results:

  • Diagnosis is frequently tentative and relies on circumstantial evidence.
  • Supportive care, including fluid therapy, oxygen, and pain management, is the mainstay of treatment.
  • Corticosteroid and antioxidant therapies have not demonstrated improved outcomes.

Conclusions:

  • The prognosis for horses experiencing acute hemolysis from Acer or Pistacia ingestion is guarded to poor.
  • Horses surviving the initial six days post-exposure have a better outlook for recovery.
  • Understanding the pyrogallol pathway is crucial for managing and preventing these toxic events.