title: His bundle rhythms with retrograde conduction to the atria.
mesh_terms: D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000294:innervation; D006327:Heart Block / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate / Q000187:drug effects; D006352:Heart Ventricles / Q000294:innervation; D006801:Humans; D008297:Male; D009921:Metaproterenol / Q000494:pharmacology; D009410:Nerve Degeneration; D012849:Sinoatrial Node / Q000503:physiopathology; D013610:Tachycardia / Q000209:etiology
chemical_list: D009921:Metaproterenol