We introduce the probe pH monitoring through the nose to reach the lower esophageal sphincter ( by reference to the location of the lower esophageal sphincter by manometry found). Probe is then removed, leaving 5 cm above the lower esophageal sphincter . The patient is instructed to perform their usual daily activity, a symptom diary recording . The probe is connected to a Holter apparatus that recorded during 24 the number of reflows , measure their duration in minutes and the duration of the longest reflux episode, the percentage of time that esophageal pH is less than 4. All measurements were recorded at both the proximal and distal esophagus. After 24 hours the tube is removed and information is processed by a computer program (PC Polygraf, Synectics Medical).