<prompt> A patient put on ventilator shows a reading of ABG analysis as PaCO2, Normal PaO2 and pH 7.5, what is the likely diagnosis?Respiratory acidosisMetabolic alkalosisMetabolic acidosisRespiratory alkalosis  <response>: The ABG analysis reading in this patient clearly ours for respiratory alkalosis. In respiratory alkalosis: ? PaCO2 ? HCO3PaCO2 ratio ? pH ? the plasma K is often reduced and Cl increased Respiratory alkalosis is commonly seen in anesthetized or mechanically ventilated patient. Ref: Harrisons Internal Medicine, 18th Edition, Pages 363-372 