Atrial fibrillation. 3. A study of the fibrillatory waves using a new technique.
D000368:Aged; D000669:Amplifiers, Electronic; D000787:Angina Pectoris / Q000503:physiopathology*; D001281:Atrial Fibrillation / Q000503:physiopathology*; D004562:Electrocardiography; D004582:Electronics, Medical / Q000295:instrumentation; D006333:Heart Failure / Q000503:physiopathology*; D006339:Heart Rate; D006349:Heart Valve Diseases / Q000503:physiopathology*; D006801:Humans; D008722:Methods; D008875:Middle Aged