RESUMEN
Ambulatory esophageal pH monitoring is the current gold standard diagnostic exam for gastroesphageal reflux disease. Presently, no data are available for normal 24-hour esophageal pH monitoring among any US ethnic group. The aim of the present study was to obtain normal values of 24-hour esophageal pH monitoring in healthy adult African American (AA) volunteers and compare these with values obtained in healthy non-Hispanic white (nHw) volunteers to determine if ethnic variation exists in 24-hour esophageal pH testing. Twenty-four-hour dual esophageal pH monitoring was performed in healthy AA and nHw. Values for total number of reflux episodes, episodes longer than 5 min, total reflux time in minutes, and longest reflux episode in the proximal and distal esophagus were obtained for both ethnic groups. Differences between groups were considered significant if P < 0.05. Eighty subjects volunteered for the study and completed 24-hour pH testing. Forty-one were AAs and 39 were nHws, with males making up 49% of each group. The AAs were older and had higher body mass index than the nHws. No difference was observed between the AA and the nHw subjects for any measured pH parameter in either the proximal or distal esophagus. There is no difference in values obtained during esophageal pH monitoring in healthy African Americans and non-Hispanic whites. This indicates that the currently accepted normal values of ambulatory esophageal pH monitoring are readily applicable to African Americans and can be used without compromising diagnostic accuracy in this ethnic group.