Effect of ventricular extrasystoles on closure of mitral valve.
D000818:Animals; D006328:Cardiac Catheterization; D003720:Densitometry; D004285:Dogs; D004558:Electric Stimulation; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006439:Hemodynamics; D008943:Mitral Valve / Q000000981:diagnostic imaging / Q000502:physiology*; D008944:Mitral Valve Insufficiency / Q000209:etiology; D009119:Muscle Contraction; D011312:Pressure; D011859:Radiography; D016276:Ventricular Function