[The influence of ventricular ectopic beats on left ventricular wall motion].
D000818:Animals; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D004285:Dogs; D004558:Electric Stimulation; D004562:Electrocardiography; D009200:Myocardial Contraction; D013318:Stroke Volume; D016276:Ventricular Function