HypovolemiaShockBlood VolumeLower Body Negative PressureShock, HemorrhagicShock, SepticPlasma VolumeFluid TherapyDehydrationBlood Volume DeterminationHypotension, OrthostaticIsotonic SolutionsFluid ShiftsPlasma SubstitutesVascular CapacitanceDiureticsFurosemideThirstHypernatremiaHemodynamicsBed RestHead-Down TiltHemodilutionInappropriate ADH SyndromeHemorrhageIntracranial HypotensionBlood PressureResuscitationHypotensionHeat-Shock ProteinsCardiac OutputShock, CardiogenicHeart RateSupine PositionHyponatremiaHydroxyethyl Starch DerivativesDrinkingWater-Electrolyte BalanceStroke VolumeSpectroscopy, Near-InfraredHematocritVasopressinsCardiovascular System