A patient with acute bacterial pneumonia is being mechanical…

A patient with acute bacterial pneumonia is being mechanically ventilated in the Volume Control mode with an FiO2 of .45 and a set tidal volume of 500ml. The patient appears anxious, biting on the tube, and has a total respiratory rate of 35. Blood gas results are as follows: PH 7.56 PaCo2   28torr PaO2 95torr HCO3 24mEq/L Which of the following drugs should the therapist recommend?