mall airways in chronic obstructive pulmonary disease
why ignore them on spirometry report?
DOI:
https://doi.org/10.11606/issn.1679-9836.v98i5p329-333Keywords:
Pulmonary disease, chronic obstructive, Oscillometry, SpirometryAbstract
According to World Health Organization the chronic obstructive pulmonary disease (COPD) was the fourth cause of death worldwide in 2012.The disorder of small airways is an important element in COPD. Narrowing of small airways is the major cause of increased airflow resistance in COPD, and there is evidence that small airway disorders occur early in the natural history of COPD. Thus, it is important that spirometry and other tests such as impulse oscillometry are used for the diagnosis of small airway disorders. In spirometry report, measurements of maximal mid expiratory flow or forced expiratory flow at 25%-75% of forced vital capacity (MMEF75%–25% or FEF25%-75%) should be considered after the absence of obstruction are determined using the primary variables. If the FEV1 / FVC% ratio is borderline, a reduction in MMEF 75%-25% or other terminal flows corrected for forced vital capacity, or elevated forced expiratory time, diagnose obstruction on small airways in symptomatic respiratory subjects.
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