Esophageal 24h pH Monitoring

Using the pH gradient method, the lower electrode of the pH monitor was placed 5 cm above the upper edge of the lower esophageal sphincter. The upper electrode of the lead was placed 20 cm above the upper edge of the lower esophageal sphincter. The pH value of the esophagus was recorded continuously for 10, 12 and 24 hours. To understand the pH of the esophagus. The general monitoring time is above 18h. For patients suspected of having reflux esophagitis. Basic Information Specialist classification: Digestive examination classification: other examinations Applicable gender: whether men and women apply fasting: fasting Tips: Drugs that affect gastric acid secretion and gastrointestinal motility should be discontinued 3 days before the test. Normal value There are three monitoring indicators: (1) Total acid exposure time 24 hours total, standing time, lying position pH < 4 total time percentage. (2) The number of times the acid exposure frequency is pH<4. (3) The duration of acid exposure is ≤5 minutes and the longest reflux duration. The above indicators are calculated by the computer's Demeester system. The foreign data indicates a normal value of <14.72, while the domestic limited data indicates <12.4. The normal 24h esophageal pH reference value is <4% of the total time of pH<4, the reflux number of pH<4 is <60, the reflux is >5min times ≤2, and the longest reflux duration is <16min. Clinical significance 24h esophageal pH monitoring Demeester score ≥ 12.70, seen in gastroesophageal reflux disease. High results may be diseases: pediatric functional dyspepsia, reflux esophagitis, gastroesophageal reflux disease, infant gastroesophageal reflux precautions 1. Drugs that affect gastric acid secretion and gastrointestinal motility should be discontinued 3 days before the test. 2. There are many kinds of pH electrodes. The commonly used ones in the country are monopolar single crystal germanium electrodes. It is necessary to use the external reference electrode at the same time. The glass electrode is not required to use the reference electrode. 3. Before the test, the positive electrode was prepared in vitro with pH 1.07 and 7.01 standard buffer, and the reference electrode was placed under the xiphoid process. Inspection process 1. Prior to the test, the positive electrode was prepared in vitro with pH 1.07 and 7.01 standard buffer, and the reference electrode was placed under the xiphoid process. 2. Insert the pH electrode from the nasal cavity and place it 5 cm above the lower esophageal sphincter (LES). The determination of this part is very important for the correctness of the monitoring. It can be measured by pressure measurement, pH gradient method, endoscope or fluoroscopy. . 3. Fix the lead to the cheek and connect the cassette recorder. 4. After the inspection is completed, connect the recorder to the computer, input the data, and analyze the change of the esophageal 24h pH according to clinical needs. Not suitable for the crowd Patients with corrosive esophagitis. Adverse reactions and risks Generally no adverse reactions.