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A representative phrenic nerve recording showing that fentanyl (8 μg/kg, iv) turns the PBG (3 μg/kg)-induced RSB into an apnea without changing the tracheal pressure and the partial recovery from the apnea in a paralyzed and ventilated rat. The traces from the top to bottom are arterial blood pressure (ABP), tracheal pressure (Pt), phrenic nerve activity (PNA) and integrated PNA (iPNA).
