Autonomic DysreflexiaSpinal Cord InjuriesSpinal CordQuadriplegiaAutonomic Nervous System DiseasesReflex, AbnormalIntracranial Hemorrhage, HypertensiveParaplegiaReflexAutonomic Fibers, PreganglionicGalvanic Skin ResponseUrodynamicsRectumDoxazosinThoracic VertebraeCervical VertebraeSpinal Cord DiseasesAfferent PathwaysSpinal Cord CompressionSpinal Cord NeoplasmsBlood PressureAdrenergic alpha-AntagonistsReceptors, Adrenergic, alphaRats, WistarHeart RateColonSpinal Cord Ischemia