Valsalva ManeuverSinus of ValsalvaTexasMexican AmericansAutonomic Nervous SystemAutonomic Nervous System DiseasesHeart Septal Defects, AtrialPelvic FloorEmbolism, ParadoxicalPure Autonomic FailureBiobibliography as TopicPostureUltrasonography, Doppler, TranscranialHypotension, OrthostaticHeadache Disorders, PrimaryBlood PressureSupine PositionHeart RateForamen Ovale, PatentBaroreflexMaximal Voluntary VentilationHorse DiseasesPneumocephalusButylscopolammonium BromideUterine ProlapseMexicoGonadotropins, EquineKinetocardiographyHypovolemiaAortic AneurysmFactor VaPatient PositioningVaricoceleTilt-Table TestEchocardiography, TransesophagealPerineumRespirationCentral Venous PressureInterior Design and FurnishingsHypoprothrombinemiasReflexThoraxHaplosporidaHead-Down TiltHemostasis, SurgicalMicroscopy, Acoustic