The response to inhaled bronchodilator is helpful in distinguishing between chronic obstructive lung disease (COLD) and asthma.
In chronic obstructive lung disease the airway resistance is relatively fixed and unresponsive to inhalation of a bronchodilator.
In asthma the bronchoconstriction responds to inhalation of a bronchodilator.
Response to Bronchodilators
FVC (after)-to-FVC (before)
FEV1 (after)-to-FEV1 (before)
FEF(25-75%) (after)-to-FEF(25-75) (before)
not clearly responsive
1.05 - 1.14
1.05 - 1.11
1.10 - 1.44
1.15 - 1.24
1.12 - 1.24
1.45 - 1.99
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Purpose: To compare spirometry values before and after bronchodilator therapy.
Objective: clinical diagnosis, including family history for genetics, other testing, severity, prognosis, stage, complications, administration
ICD-10: J20-J22, J40-J47, R94.2,