Electrophysiologic studies of the sinus node and atria.
D001146:Arrhythmia, Sinus / Q000175:diagnosis; D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D001281:Atrial Fibrillation / Q000175:diagnosis; D001282:Atrial Flutter / Q000175:diagnosis; D001283:Atrioventricular Node / Q000502:physiology*; D001919:Bradycardia / Q000175:diagnosis; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D004594:Electrophysiology / Q000379:methods; D006329:Heart Conduction System / Q000502:physiology*; D006801:Humans; D012804:Sick Sinus Syndrome / Q000175:diagnosis; D012849:Sinoatrial Node / Q000502:physiology*; D013610:Tachycardia / Q000175:diagnosis