title: Sinus node disease in chronic bundle branch block.
mesh_terms: D000368:Aged; D002037:Bundle-Branch Block / Q000175:diagnosis*; D002908:Chronic Disease; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012804:Sick Sinus Syndrome / Q000175:diagnosis*