The spirometric parameters of interest are forced vital capacity (FVC), forced expiratory flow
in 1 second ([FEV.
Role of forced expiratory flow
at 25-75% as an early marker of small airways impairment in subjects with allergic rhinitis.
Additionally, evidence suggests that the forced expiratory flow
(FEF25-75) decreases before the FEV1 in most bilateral and heart-lung transplant recipients with OB.
1]/FVC (per cent), forced expiratory flow
at 50 per cent of FVC, forced expiratory flow
at 75 per cent of FVC and forced expiratory flow
at 25-75 per cent of FVC were normal or near normal (Table I).
Lung parameters such as forced vital capacity, forced expiratory volume in 1 s, forced expiratory flow
in 25-75%, and peak expiratory flow rate were measured.
3]), peak expiratory flow rate (PEFR), mean forced expiratory flow
rate from 0.
8] The maximal forced expiratory flow
, midexpiratory phase (FEF 25%-75%) as a measure of small airway disease, has been shown to be a sensitive measure of airway obstruction.
In each study, the groups given rolling assessments and education had significant improvements in forced expiratory flow
(FEF25%-75%) over baseline measures.
X%]: The instantaneous forced expiratory flow
rate at the point where X% of the FVC has been expired, e.
66 82 DLCO (mL/min/mmHg) TLC (L) RV(L) FVC = forced vital capacity FEV1 = forced expiratory volume in 1 second FEF25-75 = forced expiratory flow
25-75% PEF = peak expiratory flow TLC = total lung capacity RV = residual volume DLCO = diffusion capacity of lungs for carbon monoxide pre-Rx = before bronchodilator post-Rx = after bronchodilator % Pred = percent of predicted value L = liters, mL = milliliters mm = millimeters Hg = mercury sec = second, min = minute