[Electrophysiologic evaluation of the etiology of sick sinus syndrome--characteristics in aged patients].
D000328:Adult; D000368:Aged; D004562:Electrocardiography; D004594:Electrophysiology; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012032:Refractory Period, Electrophysiological; D012804:Sick Sinus Syndrome / Q000503:physiopathology*