title: Electrophysiology of atrial pacing in patients with short PR interval, normal QRS complex.
mesh_terms: D000293:Adolescent; D000328:Adult; D001145:Arrhythmias, Cardiac / Q000188:drug therapy / Q000503:physiopathology*; D006328:Cardiac Catheterization; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000188:drug therapy / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011433:Propranolol / Q000627:therapeutic use; D013610:Tachycardia / Q000150:complications / Q000503:physiopathology
chemical_list: D011433:Propranolol