Mechanisms in reciprocal rhythm.
D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria; D006329:Heart Conduction System / Q000503:physiopathology*; D006352:Heart Ventricles; D006801:Humans; D008875:Middle Aged; D009626:Terminology as Topic