pH of the contents of the duodenal bulb in relation to duodenal ulcer.

EDITORIAL SYNOPSIS Wide fluctuations ofpH were found in the duodenal bulb for at least six hours after a meal.There was a clear correlation between pain and duodenal acidity.To test the hypothesis that duodenal ulcer is caused by abnormal acidity, it is necessary to measure acidity in the ulcer-bearing part of the duodenum.Previous investigators have attempted to do this, either by aspirating duodenal contents (Morton, 1929;