80 year old man, tachypnoeic, borderline hypoxia with…
Mixed respiratory and metabolic alkalosis – expected CO2 for HCO3 of 28.6 would be 40
Normal A-a gradient
Normal Na, Cl, Glucose, lactate
Central and peripheral causes of Respiratory alkalosis
Normal A-a gradient implies no shunt or VQ mismatch
This patient had a pneumonia and his blood gas normalised after 1 litre of Normal Saline!!