title: [CSF morphine concentration and analgesic effect].
mesh_terms: D000005:Abdomen / Q000601:surgery; D000293:Adolescent; D000328:Adult; D000368:Aged; D000767:Anesthesia, Epidural; D005260:Female; D006801:Humans; D008875:Middle Aged; D009020:Morphine / Q000134:cerebrospinal fluid; D013748:Tetracaine / Q000008:administration & dosage; D013997:Time Factors
chemical_list: D013748:Tetracaine; D009020:Morphine