Frequency of ventricular arrhythmias in apparently healthy, large breed dogs during seven-day Holter monitoring

29 apparently healthy, large-breed dogs without known predisposition to cardiomyopathy, no history of systemic illness, and normal physical examination findings (predominantly older dogs). Initially 31 dogs enrolled, 2 excluded due to systemic disease.

Continuous 7-day ambulatory electrocardiographic (Holter) monitoring

Frequency, complexity, and spontaneous day-to-day variation of ventricular arrhythmiassurrogate