Twenty‐four hour ambulatory electrocardiography in healthy dogs: reference intervals and measurement variability

Reference intervals for heart rates and PR intervals obtained from ambulatory electrocardiographic are proposed. Repeatability coefficients, which provide an estimate of what might represent a clinically relevant change when serially acquired ambulatory electrocardiographic recordings are compared, are reported. PR intervals were positively correlated with body size. These data might be of use when reviewing ambulatory electrocardiographic recordings.