A follow-up study with pH and pressure measurements in patients treated for cardiospasm by Heller's operation.
D004931:Esophageal Achalasia / Q000601:surgery*; D004947:Esophagus / Q000502:physiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008722:Methods; D008875:Middle Aged; D011312:Pressure; D013270:Stomach / Q000502:physiology