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Spirometry helps diagnose obstructive lung diseases by assessing bronchodilator response (RBD). A significant RBD, defined by specific lung function increases, aids in differentiating asthma from COPD.

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Area of Science:

  • Pulmonology
  • Respiratory Medicine
  • Clinical Diagnostics

Background:

  • Spirometry is crucial for diagnosing obstructive airways diseases.
  • Assessing bronchodilator response (RBD) is key for differentiating asthma and COPD.
  • RBD helps in grading obstruction severity in COPD patients.

Purpose of the Study:

  • To outline the importance and methodology of assessing bronchodilator response in spirometry.
  • To clarify the role of RBD in diagnosing and managing obstructive lung diseases.
  • To define the criteria for a significant bronchodilator response.

Main Methods:

  • Spirometry performed before and after short-acting bronchodilators.
  • Measurement of Forced Expiratory Volume in 1 second (FEV1) and Forced Vital Capacity (FVC).
  • Evaluation of changes in FEV1 and FVC against baseline values.

Main Results:

  • A significant bronchodilator response is defined as an increase in FEV1 or FVC by > 200 ml and 12% of the baseline value.
  • RBD is valuable for differentiating asthma from COPD and assessing COPD severity.
  • Inhaled therapy should generally not be interrupted before spirometry, except for asthma diagnosis.

Conclusions:

  • Systematic assessment of spirometry with bronchodilator response is essential for obstructive airways diseases.
  • RBD is a diagnostic tool, not a sole determinant for initiating bronchodilator therapy.
  • Rare cases of paradoxical lung function loss necessitate considering alternative bronchodilators.