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Spirometric changes in obstructive disease: after all, how much is significant?

André Luis Pinto Soares1, Carlos Alberto de Castro Pereira, Silvia Carla Rodrigues

  • 1Federal University of Rio Grande do Norte, Natal, Brazil. drandrepinto@globo.com

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Summary
This summary is machine-generated.

This study defines significant changes in lung function tests for patients with airflow obstruction. Inspiratory capacity (IC) shows greater variability than FVC or SVC after placebo.

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Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology

Background:

  • Airflow obstruction necessitates reliable methods to assess lung function changes.
  • Establishing upper limits for placebo-induced changes in spirometry is crucial for clinical trial interpretation.

Purpose of the Study:

  • To determine the upper limits for changes in FEV1, SVC, FVC, and IC following placebo administration in patients with airflow obstruction.
  • To provide reference values for significant lung function responses in clinical studies.

Main Methods:

  • 102 adults with airflow obstruction underwent SVC and FVC maneuvers pre- and post-placebo.
  • Changes in FEV1, SVC, FVC, and IC were analyzed as absolute values, % change from baseline, and % predicted.
  • 95% CIs and 95th percentiles were calculated; factor analysis was used to cluster parameter changes.

Main Results:

  • Upper limits for significant changes (absolute values): FEV1=0.20 L, FVC=0.20 L, SVC=0.25 L, IC=0.30 L.
  • Upper limits for significant changes (% from baseline): FEV1=12%, FVC=7%, SVC=10%, IC=15%.
  • Upper limits for significant changes (% predicted): FEV1=7%, FVC=6%, SVC=7%, IC=12%.

Conclusions:

  • Inspiratory capacity (IC) exhibits greater variability than FVC and SVC in this population.
  • Significant changes for IC are >0.30 L or 15% from baseline; for FVC, >0.20 L or 7% from baseline.
  • Significant changes for FEV1 and FVC can also be defined as >0.20 L or 7% of predicted values.