Key result
Atrial myocarditis was identified on post-mortem histology as the cause of electrical asystole and fatal collapse in a 10-year-old dog with myxomatous mitral valve disease.
Case Report (n=1)
This is the first reported case of collapse due to electrical asystole in a dog with atrial myocarditis.
May prompt consideration of atrial myocarditis in dogs with MMVD and unexplained collapse; first case leaves open need for prospective studies.
A 10-year-old male cairn terrier cross was presented with a history of myxomatous mitral valve disease diagnosed six months previously and with a four-week history of intermittent collapse. On 24 hour electrocardiograph (Holter) analysis, periods of no discernable electrical cardiac activity, which coincided with three collapsing episodes, were identified. Unfortunately, on re-presentation for removal of the Holter monitor, the dog collapsed and died. A post-mortem examination was conducted, and histology of the right and left atrium showed evidence of myocarditis. This is the first reported case, to our knowledge, of collapse because of electrical asystole in a dog with atrial myocarditis.
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Woolley et al. (2007) conducted a case report in Atrial myocarditis and sinus arrest (n=1). Atrial myocarditis was evaluated on Collapse and death due to electrical asystole. Atrial myocarditis was identified on post-mortem histology as the cause of electrical asystole and fatal collapse in a 10-year-old dog with myxomatous mitral valve disease.
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