Evidence for marsh mallow (Malva parviflora) toxicosis causing myocardial disease and myopathy in four horses

Abstract

Reason for performing the study: Investigation of toxicosis caused by Malva parviflora was required after 4 horses from the same farm developed severe muscle fasciculations, tachycardia, sweating and periods of recumbency leading to death or euthanasia after ingesting the plant. Objectives: To describe historical, clinical, clinicopathological and pathological findings of 4 horses with suspected M. parviflora toxicosis. The role of cyclopropene fatty acids (found in M. parviflora) and mechanism for toxicosis are proposed. Study design: Case series. Methods: Historical, physical examination, clinicopathological and pathological findings are reported. Due to similarities with atypical myopathy..