Morning Report 10/28 – PFTs

Teaching Pearls:

  • FEV1/FVC Ratio <0.7 suggestive of obstructive parenchymal disease
  • DLCO – ability for gas to diffuse across alveolar capillary membrane.  CO (inhaled) – CO (exhaled). CO has a high affinity for Hb. If CO (exhaled) is higher than expected, DLCO is low and this is suggestive of diffusion problem.
    • False Positive
      • Anemia
      • Pulmonary hypertension
    • False Negative
      • Pulmonary hemorrhage
  • Pulmonary Function Tests
      FEV1 FVC FEV1/FVC DLCO TLC RV F-V
    Emphysema Decrease Decrease/No change <70% Decrease Normal/increase Normal/increase C
    Chronic Bronchitis Decrease Decrease/No change <70% Normal Normal/increase Normal/increase C
    ILD

     

    Normal/Decrease Normal/Decrease Normal/Increase Decrease Decrease Decrease A
    Tracheal stenosis Decrease Decrease/normal Decrease Normal Normal Normal B
    Resp muscle weakness Decrease Decrease Normal Normal Decrease Increase D

    A.  Restrictive

    B. tracheal stenosis

  • C. obstructive
  • D. resp weakness

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