[Transesophageal atrial pacing for evaluation of sinoatrial node function in the elderly: a preliminary study].
D000368:Aged; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D004947:Esophagus; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012849:Sinoatrial Node / Q000502:physiology*; D013997:Time Factors