title: Maximal velocity of contractile element shortening (Vmax) as an index of contractile state in the intact ventricle.
mesh_terms: D000818:Animals; D004285:Dogs; D004562:Electrocardiography; D006352:Heart Ventricles / Q000187:drug effects; D009638:Norepinephrine / Q000494:pharmacology; D016276:Ventricular Function
chemical_list: D009638:Norepinephrine