title: Third-Degree Atrioventricular Block and Collapse Associated with Eosinophilic Myocarditis in a Horse.
abstract: Third-degree atrioventricular block (AVB) and primary inflammatory myocarditis are uncommon findings in horses. The horse of this report presented for collapse at rest and was found to have multiple cardiac arrhythmias, most notably 3rd-degree AVB. The horse was subsequently diagnosed with eosinophilic myocarditis on necropsy, a rare form of myocarditis not previously reported in horses. Despite extensive testing, an etiologic agent could not be identified, illustrating the difficulty in identifying a specific cause of myocarditis in horses.
authors.affiliation: Department of Clinical Studies-New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA.
authors.forename: D
authors.identifier: http://orcid.org/0000-0003-1693-2147
authors.initials: D
authors.lastname: Luethy
authors.affiliation: Department of Clinical Studies-New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA.
authors.forename: J
authors.initials: J
authors.lastname: Slack
authors.affiliation: Ryan Veterinary Hospital, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA.
authors.forename: M S
authors.initials: MS
authors.lastname: Kraus
authors.affiliation: Ryan Veterinary Hospital, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA.
authors.forename: A R
authors.initials: AR
authors.lastname: Gelzer
authors.affiliation: Department of Clinical Studies-New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA.
authors.forename: P
authors.initials: P
authors.lastname: Habecker
authors.affiliation: Department of Clinical Studies-New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA.
authors.forename: A L
authors.initials: AL
authors.lastname: Johnson
mesh_terms: D000818:Animals; D054537:Atrioventricular Block / Q000209:etiology / Q000503:physiopathology / Q000662:veterinary*; D004562:Electrocardiography / Q000662:veterinary; D004802:Eosinophilia / Q000150:complications / Q000175:diagnosis / Q000473:pathology / Q000662:veterinary*; D005260:Female; D006734:Horse Diseases / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D006736:Horses; D009205:Myocarditis / Q000150:complications / Q000473:pathology / Q000662:veterinary*
keywords: Arrhythmia; Cardiac; Heart; Syncope