Esophageal pH MonitoringHydrochloric AcidGastroesophageal RefluxEsophagusHydrogen-Ion ConcentrationGastric Acidity DeterminationProton Pump InhibitorsGastric AcidManometryGastric JuiceCapsule EndoscopyPneumonia, AspirationEsophagoscopyMonitoring, PhysiologicMonitoring, AmbulatoryStomachNitric AcidAntacidsGastric MucosaRanitidineAnti-Ulcer AgentsDecalcification TechniqueTrifluoroacetic AcidCountercurrent DistributionOmeprazoleFamotidinePentagastrin2-PyridinylmethylsulfinylbenzimidazolesAcidsGastrinsDuodenogastric RefluxHistamine H2 AntagonistsFluoroacetatesDuodenumAchlorhydriaStomach UlcerParietal Cells, GastricSulfuric AcidsMagnesium HydroxideGastric FistulaAlkalosisSodium HydroxideLansoprazolePepsin AAcidosisTechnetium Tc 99m DisofeninAppendixCimetidineGastrointestinal ContentsBicarbonatesSodium ChlorideCross-Over StudiesRabeprazoleSpectrophotometry, AtomicPreanesthetic Medication