title: [Study on the diurnal change of arrhythmia attacks in sick sinus syndrome].
mesh_terms: D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000209:etiology*; D002940:Circadian Rhythm; D004562:Electrocardiography; D005260:Female; D006323:Heart Arrest / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012804:Sick Sinus Syndrome / Q000150:complications*