title: Sinus node electrogram studies in patients with sick sinus syndrome.
mesh_terms: D000328:Adult; D006328:Cardiac Catheterization; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012804:Sick Sinus Syndrome / Q000503:physiopathology*; D012849:Sinoatrial Node / Q000503:physiopathology*