Selective epidural analgesia.
D000698:Analgesia / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage*; D000767:Anesthesia, Epidural / Q000379:methods*; D006801:Humans; D004091:Hydromorphone / Q000008:administration & dosage; D009619:Nociceptors / Q000187:drug effects
D000701:Analgesics, Opioid; D004091:Hydromorphone