title: Sinus and atrial parasystole.
mesh_terms: D001146:Arrhythmia, Sinus / Q000175:diagnosis*; D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis; D006801:Humans; D008875:Middle Aged