title: Time relationship between two pacemakers in nodal parasystole.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D012849:Sinoatrial Node / Q000503:physiopathology*