title: Observations in patients with supraventricular tachycardia having a P-R interval shorter than the R-P interval: differentiation between atrial tachycardia and reciprocating atrioventricular tachycardia using an accessory pathway with long conduction times.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001283:Atrioventricular Node / Q000503:physiopathology; D001285:Atropine / Q000494:pharmacology; D002304:Cardiac Pacing, Artificial; D002346:Carotid Sinus / Q000503:physiopathology; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D004594:Electrophysiology; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000209:etiology / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D005082:Physical Exertion; D013610:Tachycardia / Q000503:physiopathology*; D014636:Valsalva Maneuver
chemical_list: D001285:Atropine