Cerebral evoked potentials response to esophageal mucosal acid exposure and distention in patients with non-erosive gastro-oesophageal reflux disease / 中华消化杂志

ABSTRACT

Objective To investigate characteristics and alternation of cerebral evoked potentials (CEP) response to esophageal mucosal acid exposure and distention in patients with non-erosive gastro-oesoph- ageal reflux disease (NERD) and in healthy subjects,and to study the mechanism of visceral hypersensitivity in NERD.Methods Twenty-one NERD patients and 10 volunteers were recruited.Mechanical distention stimulation and acid perfusion of the esophagus were performed using the balloon-affixed and polyvinyl multi- lumen catheter.First,maximally tolerated pain thresholds of all subjects were recorded,then esophageal mechanical stimulation with a 75% of maximal tolerated intensity and a frequency of 0.2 Hz was performed altogether 64 times by means of a computer-controlled barostat.The alternation of esophageal CEP was recorded before and after acid perfusion with a multichannel international 10-20 system of electroencephalography. Experimental data was analyzed by student's t-test and one way analysis of variance.Results Esophageal mu- cosal distention may evoke recognizable and reproducible and multi-peak CEP.The latencies for N1,P1 and N2 in volunteers were (246?77),(388?84)and (502?78) ms,CEP morphology of NERD patients was charac- terized by randomly distributed patterns,and the latencies for N1 ,P1 and N2 were (192?46),(293?76) and (440?79)ms,significantly shorter for mechanical stimulation compared with those of control group respectively (all P value