title: Aortic valve proximity and unidirectionality in counterpulsation.
mesh_terms: D000818:Animals; D001021:Aortic Valve / Q000502:physiology*; D001243:Assisted Circulation; D001783:Blood Flow Velocity; D003326:Coronary Circulation; D004285:Dogs; D004562:Electrocardiography; D006339:Heart Rate; D007022:Hypotension / Q000503:physiopathology