evidence: The percentage of patients who showed restlessness was lower in the Combination group than in the PF group; however, there was no statistically significant difference between the two groups (6.9 % vs. 24.1 %,
  P
   = 0.144).
intervention: combination of propofol (PF) and dexmedetomidine (DEX) (Combination group)
comparator: PF alone (PF group)
outcome: The maintenance dose of PF