Details of the case:  A 1 month, 10 day-old neonate is suffering from lobar pneumonia with Coronary Heart Disease and the presence of mild to moderate Mitral  Regurgitation. He is kept on midazolam, 5 microgram /kg/min, and on a mechanical ventilator with ACPC mode, then shifter to PSIMV mode.

But blood gas shows, pH 7.66, pco2 21, and bicarbonate 26. What should be the next step in management?