The effect of antacid on gastric and duodenal bulb acidity

Area of Science:

• Gastroenterology
• Clinical Pharmacology

Background:

• Duodenal ulcers are associated with high gastric and duodenal acidity.
• Effective management of acidity is crucial for ulcer healing and symptom relief.

Purpose of the Study:

• To investigate the effect of a standard antacid dose on gastric and duodenal pH in patients with duodenal ulcers.
• To quantify changes in acidity and hydrogen ion concentration following antacid administration.

Main Methods:

• A digital pH meter with a glass electrode was used to continuously monitor duodenal bulb pH in four ulcer patients.
• A microcomputer system managed data collection, calibration, and storage.
• Gastric and duodenal pH were recorded before and after administration of 10 ml of liquid antacid.

Main Results:

• Before antacid, mean gastric pH was 1.5 and duodenal pH was 4 (2500 µmol/L H+).
• Antacid ingestion increased mean gastric pH to 3 and duodenal pH to 6 (250 µmol/L H+).
• The antacid's effect on acidity was observed in all patients, but with considerable inter-individual variation in magnitude and duration.

Conclusions:

• A single 10 ml dose of antacid significantly reduces gastric and duodenal acidity in duodenal ulcer patients.
• Individual responses to antacid therapy exhibit substantial variability, necessitating personalized treatment approaches.
• Continuous pH monitoring provides valuable data for assessing the efficacy and variability of acid-suppressing medications.