Retrograde conduction from artificial pacemaker to atria in sick sinus syndrome.
D001146:Arrhythmia, Sinus / Q000503:physiopathology*; D001919:Bradycardia / Q000503:physiopathology; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D013610:Tachycardia / Q000503:physiopathology