Localization of recording site in the esophagus by means of cardiac artifacts.
D000328:Adult; D000388:Air; D002404:Catheterization; D004562:Electrocardiography; D004947:Esophagus / Q000502:physiology*; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008170:Lung Compliance; D008297:Male; D011312:Pressure; D013147:Spirometry