title: Unexpectedly high plasma fentanyl levels after epidural use.
mesh_terms: D004824:Epidural Space; D005283:Fentanyl / Q000008:administration & dosage / Q000097:blood*; D006801:Humans; D007925:Leriche Syndrome / Q000601:surgery; D008297:Male; D008875:Middle Aged
chemical_list: D005283:Fentanyl