If the dosage of sufentanil and fentanyl exceeded the upper limited dose ( sufentanil 0.3 gkg ( -1 ) h ( -1 ) , fentanyl 2 gkg ( -1 ) h ( -1 ) ) but FPS could not meet ( still > 2 ) , and maintained the upper limited doses of sufentanil and fentanyl and added midazolam , and FPS2 or Ramsay 3 could meet the standard .