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Welcome, medical contents search May 10, 2013
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Lung scans

  • Normal ventilation and perfusion

- Ventilation-perfusion ratio of 0.85 or greater

  • Perfusion scan:

- Serum albumin passed through the right side of the heart into pulmonary artery.  A radiation detector scan of the lungs shows the diffusion of the radioactive albumin throughout the pulmonary vessels

  • Ventilation scan:

- Xenon-133, Xenon-127, or krypton-81 m is given via inhalation.

  • To evaluate patients with decreased pulmonary function
  • Ventilation scan -- to evaluate the distribution of gas within the lungs
  • Perfusion scan -- to evaluate pulmonary arterial blood flow
  • V/Q scans are ordered to confirm the diagnosis of Pulmonary Emboli

  • Uncooperative patients

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