Isobaric spinal anesthesia for anorectal surgery.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001003:Anal Canal / Q000601:surgery*; D000775:Anesthesia, Spinal; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012007:Rectum / Q000601:surgery*; D013748:Tetracaine
D013748:Tetracaine