Normal findings on a ventilation perfusion scan

What are the normal findings on a ventilation perfusion scan?

A normal V/Q scan consists of uniform ventilation throughout both lung fields. On a 133 Xe ventilation scan, there is usually good inflow of the gas, uniform radiotracer activity in the lungs during the equilibrium phase that lasts approximately 3 minutes as the patient breathes into the closed system of the machine, and then rapid and uniform washout from the lungs within about 1 to 2 minutes. No radiotracer activity should be observed in the brain, because this would imply the presence of a right-to-left shunt. On the 99m Tc-MAA perfusion scan obtained in the supine position, uniform radiotracer uptake is seen throughout the lungs.

Causes of Gas Trapping on a ventilation perfusion scan

  • • Asthma
  • • COPD
  • • Chronic bronchitis
  • • Mucous plug
  • • Cystic fibrosis
  • • Smoke inhalation
  • • Airways-obstructive tumor
  • • Airways-obstructive foreign body

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