Atrioventricular conduction in mammalian species: Hemodynamic and electrical scaling

(1) Late diastolic (LV) filling time scales with heart length (third root of heart mass). (2) No “mismatch” exists between AV delay and heart size. (3) Knowledge of the actual starting time of atrial contraction may contribute to better treatment of patients with heart failure. (4) The findings suggest that in evolution of mammalian species, hemodynamics commands electrical behavior of the heart.