Refractory period of the dog's ventricular myocardium following sudden changes in frequency.
D000222:Adaptation, Physiological; D000818:Animals; D004285:Dogs; D005260:Female; D006321:Heart / Q000502:physiology*; D006327:Heart Block / Q000503:physiopathology; D006339:Heart Rate; D008297:Male; D013997:Time Factors; D016276:Ventricular Function