Sympathetic blockade during spinal anesthesia.
D000328:Adult; D000775:Anesthesia, Spinal; D001808:Blood Vessels / Q000294:innervation; D001831:Body Temperature; D006801:Humans; D007022:Hypotension / Q000209:etiology; D008875:Middle Aged; D011187:Posture; D012677:Sensation / Q000187:drug effects; D012881:Skin Temperature; D013564:Sympathetic Nervous System / Q000187:drug effects* / Q000502:physiology; D013575:Syncope / Q000209:etiology; D013997:Time Factors