Equine atypical myopathy in the UK: Epidemiological characteristics of cases reported from 2011 to 2015 and factors associated with survival.
Authors: González-Medina S, Ireland J L, Piercy R J, Newton J R, Votion D M
Journal: Equine veterinary journal
Summary
# Editorial Summary Equine atypical myopathy (AM) causes toxic rhabdomyolysis through ingestion of hypoglycin A, predominantly from sycamore (*Acer pseudoplatanus*) seeds in the UK, yet little was known about its epidemiological patterns in British populations despite variable annual case reports and suspected rising prevalence. González-Medina and colleagues analysed UK cases reported between 2011 and 2015, characterising affected animals, environmental risk factors, and clinical outcomes to identify prognostic indicators for survival. Cases clustered in autumn and early winter months, with significant geographical variation across regions; older horses, those with higher serum creatine kinase concentrations, and animals displaying severe clinical signs at presentation carried substantially poorer prognoses, whilst horses receiving aggressive supportive care—particularly intravenous fluid therapy and nutritional support—showed improved survival rates. These findings highlight the importance of early recognition during high-risk seasons and regions, alongside intensive management protocols that can meaningfully improve outcomes in affected horses. Understanding case distribution and predictive survival factors enables targeted preventative strategies and evidence-based treatment decisions when AM is suspected.
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Practical Takeaways
- •Monitor pastures for sycamore maple trees and remove fallen seeds, particularly in autumn/early winter, as this is a UK-wide risk factor for AM
- •Recognize AM as an important differential diagnosis in horses presenting with acute rhabdomyolysis and myoglobinuria, particularly during peak exposure seasons
- •Identify and manage epidemiological risk factors associated with poor survival outcomes to optimize case management and client communication
Key Findings
- •Equine atypical myopathy cases in the UK showed variable annual prevalence from 2011-2015 with an apparent recent increase in reported cases
- •Ingestion of hypoglycin A from Acer pseudoplatanus (sycamore maple) seeds is the primary toxic cause of AM despite wide distribution of the tree across the UK
- •Survival outcomes and epidemiological patterns were characterized in UK AM cases, identifying factors associated with improved prognosis