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Prospective prediction of post-radiation therapy lung function using quantitative lung scans and pulmonary function

J H Rubenstein1, M P Richter, P J Moldofsky

  • 1Fox Chase Cancer Center, Philadelphia, PA.

International Journal of Radiation Oncology, Biology, Physics
|July 1, 1988
PubMed
Summary

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Quantitative perfusion lung scanning (QS) and forced expiratory volume in one second (FEV1) can predict pulmonary function after lung irradiation (XRT). FEV1 declined over time post-XRT but remained near predicted values, aiding treatment planning.

Area of Science:

  • Pulmonary Medicine
  • Radiation Oncology
  • Diagnostic Imaging

Background:

  • Quantitative perfusion lung scanning (QS) and forced expiratory volume in one second (FEV1) are established methods for assessing lung function.
  • Predicting pulmonary function after lung irradiation (XRT) is crucial for patient management and treatment planning.

Purpose of the Study:

  • To prospectively evaluate the ability of QS and FEV1 to predict pulmonary function following lung irradiation (XRT).
  • To assess the temporal changes in lung function after XRT and compare measured FEV1 with predicted values.

Main Methods:

  • Twenty-two patients underwent QS and FEV1 measurements before and at serial intervals after XRT.
  • Pulmonary function was monitored over 18 months post-irradiation.
  • Predicted final FEV1 values were compared with measured values at follow-up.

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Main Results:

  • FEV1 showed a gradual decline in the intervals of 2-6, 6-12, and 12-18 months post-XRT.
  • The group's mean FEV1 dropped by 2% (2-6 months), 12% (6-12 months), and 10% (12-18 months).
  • In 22 patients, the final measured FEV1 was consistently near the predicted value, dropping below it in only 2 patients (≤6% decline).

Conclusions:

  • QS and FEV1 provide a reliable method for predicting post-XRT pulmonary function.
  • Serial follow-up reveals a latent period followed by a late phase of FEV1 decline towards predicted values.
  • These predictions are valuable for treatment planning in patients with compromised pulmonary function.