<prompt> Hyperventilation leads to?Increased CO2Decreased CO2Increased PO2Decreased PO2  <response>: Ans. b Decreased CO2Ref: Harrison 19th ed. 1731-32 Hyperventilation leads to carbon dioxide washout. It is usually a feature of type 1 respiratory failure. Type 1 respiratory failure is defined as a low level of oxygen in the blood hypoxemia without an increased level of carbon dioxide in the blood hypercapnia, and the PaCO2 may be normal or low. It is typically caused by a ventilationperfusion VQ mismatch; the volume of air flowing in and out of the lungs is not matched with the flow of blood to the lungs. The basic defect in Type 1 respiratory failure is failure of oxygenation characterized by:PaO2Decreased 60 mmHg PaCO2Normal or Decreased 50 mmHg PA-aO2Increased 