This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Ventilation, Subject name: Medicine
[{'content': 'Hyperventilation leads to? \nSelect and explain. \nA. Increased CO2, B. Decreased CO2, C. Increased PO2, D. Decreased PO2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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 ventilation/perfusion (V/Q) 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', 'role': 'assistant'}]