Non-acid gastroesophageal reflux. Detection and evaluation by means of combined esophageal and gastric pH-monitoring.

: One hundred and fifteen partially-gastrectomized patients were submitted to combined gastric and esophageal pH-monitoring with the aim of studying non-acid gastroesophageal reflux (GER). Since the detection of non-acid GER seems to be linked to the possibility of detecting entero-gastric reflux, only those patients (61) in whom entero-gastric reflux could be evaluated were considered. 37.7% of the patients showed non-acid GER according to the personal definition of such a reflux (any sudden esophageal pH change of 0.5 or more with earlier or simultaneous entero-gastric reflux). On the contrary, with De Meester and coworkers' criteria, only 21.3% of the patients were considered alkaline refluxers. Slight symptoms and slight endoscopical/histological changes were present in 20-30% of both non-refluxers and refluxers (whichever method of GER evaluation was considered). Therefore, correlations between GER and symptoms, endoscopical changes and manometric findings seemed poor using either method of GER evaluation. However, since the theoretical basis of combined gastric and esophageal pH-monitoring seems correct and the application of new techniques and the development of the parameters of "normality" can hopefully increase our understanding, the routine use of gastric and esophageal pH-monitoring should not be abandoned.