# Perfusion and V/Q ratio?

A 66-year-old man comes to the emergency room with difficulty in breathing. He was diagnosed with severe obstructive lung disease a few years back. He uses his medication but often has to come to the emergency room for intravenous therapy to help him breathe. He was a smoker for 40 years and smoking two packs of cigarettes every day. Which of the following best represent his expected ventilation, perfusion and V/Q ratio?

1.Medium ventilation and perfusion ,V/Q that equals 8.0
2.Lower ventilation and perfusion,but higher v/Q ratio

3.Higher ventilation and perfusion with lower V/Q ratio
4.Low ventilation , normal perfusion and low V/Q ratio
5.Normal ventilation low or nonexiesion perfusion and infinitive v/Q ratio

exp: Ventilation and perfusion are not equally distributed in different parts of the lung. Because of the gravitation, blood flow is highest at the base of the lungs. Ventilation is also highest in the base, but differences of ventilation are not as large as differences in perfusion. Therefore, V/Q is normally higher at the apex and lower at the base of the lung. During obstruction, ventilation is compromised; perfusion is normal, making V/Q ratio lower than normal. Learning Objective: Ventilation and perfusion are not equally distributed in different parts of the lung. Both blood flow and ventilation are highest in the base of the lungs; however, differences in ventilation are not as large as those in perfusion, making V/Q ratio higher in the apex and lower in the base of the lung. Obstruction of ventilation that occurs in obstructive lung disease will cause V/Q ratio to be lower because the perfusion stays the same.