Esophageal Sphincter, LowerEsophageal Sphincter, UpperEsophagogastric JunctionManometryDeglutitionSphincter of OddiEsophagusPeristalsisPressureEsophageal AchalasiaGastroesophageal RefluxOpossumsPerfusionDeglutition DisordersMuscle RelaxationAnal CanalEsophageal pH MonitoringEsophageal Motility DisordersEsophagitisCricoid CartilagePharyngeal MusclesMuscle ContractionMuscle, SmoothMuscle TonusPharynxEsophagoscopyFundoplicationEsophageal DiseasesPerfusion ImagingLaryngeal MusclesFluoroscopyHernia, HiatalStomachGastrointestinal MotilityDiverticulum, EsophagealDidelphisSphincter of Oddi DysfunctionMotilinAtropineEsophagitis, PepticFecal IncontinenceGastrinsEsophageal StenosisMyocardial Perfusion ImagingCatsCatheterizationUrinary Sphincter, ArtificialEructationBethanecholDilatationMethacholine CompoundsHexamethonium CompoundsAnti-Dyskinesia AgentsUrethraPhentolamineHydrochloric AcidVagus NerveDogsReflexBarrett EsophagusElectric StimulationPropranololEndoscopy, GastrointestinalSecretinIrisCommon Bile Duct DiseasesVideo RecordingBaclofenHydrogen-Ion ConcentrationLaparoscopyTomography, Emission-Computed, Single-PhotonAcetylcholineTime FactorsAmpulla of VaterChemotherapy, Cancer, Regional PerfusionLacerationsNitric OxideRectumAnus DiseasesCoronary CirculationUrodynamicsTreatment OutcomeProspective StudiesFissure in Ano