Oesophageal pH measurement

Oesophageal pH measurement

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Credit: BSIP, LAURENT/SCIENCE PHOTO LIBRARY

Caption: Oesophageal pH measurement. Doctor passing a pH probe through a woman's nose into her oesophagus. The probe will monitor the pH (acidity) of the lower oesophagus and transmit data to a logging device (not seen) over a 24-hour period. This technique is used to diagnose gastroesophageal reflux, a condition where the contents of the stomach re-enter the oesophagus. The pH probe detects the increase in acidity of the oesophagus caused by the presence of stomach acid. The main symptoms of gastroesophageal reflux are heartburn and indigestion, and the acid may cause ulcers. Gastroesophageal reflux is often associated with hiatal hernia.

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