Esophageal pH was monitored 5 cm and 20 cm above the LES, and stored at 4-s intervals in a portable recorder (Digitrapper Mk II Gold; Synectics Medical) After the recording, the data were ...

EGG was performed using a portable EGG recorder (Digitrapper EGG—Synetics Medical, Stockholm, Sweden) as previously reported. [23] The active electrode was placed on pyloric antrum after ...