Interpretation | obstruction


Actual 1 / blue curve: pre bronchodilator, Actual 2 / red curve: post bronchodilator.

(1) Spirometry | qualitative assessment

Flow-volume curve in “armchair” shape with reduced peak flow prior to bronchodilation, nearly complete normalization following administration of bronchodilators.

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(2) Spirometry | quantitative assessment

Reduced Tiffeneau index to 42%, nearly back to normal after bronchodilation, to 75% at a FEV1 of 84%.

(3) Bodyplethysmography | residual volume

Residual volume and total lung capacity elevated. Significant decrease to 156% and 128% of the predicted value following bronchodilation, as with air trapping

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(4) Bodyplethysmography | flow-pressure-curve

Cutting angles of the loops > 90°. Club shape prior to administration of bronchodilator with nearly complete reversal.

(5) Functional tests

With decreased Tiffeneau index and lowered FEV1, bronchodilation is performed showing a significant increase in the FEV1 by 900 ml and 87%. Beware: for severity classification only the post bronchodilator values are considered.

(6) Transfer factor

Normal value transfer factor.

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Mild obstruction with significant bronchodilation success. No emphysema, marked air trapping. Unremarkable transfer factor.