title: Differential effects of functional autonomic blockade on the variables of sinus nodal automaticity in sick sinus syndrome.
mesh_terms: D000367:Age Factors; D001285:Atropine / Q000494:pharmacology; D001340:Autonomic Nerve Block; D002304:Cardiac Pacing, Artificial; D004594:Electrophysiology; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D011433:Propranolol / Q000494:pharmacology; D012804:Sick Sinus Syndrome / Q000503:physiopathology*; D012849:Sinoatrial Node / Q000503:physiopathology*
chemical_list: D001285:Atropine; D011433:Propranolol