Archive for the 'Pulmonary Function' Category

23 Mar

Reproducibility of Nasal Peak Inspiratory Flow Among Healthy Adults: Conclusion

Recently, Clarke and Jones compared PIFn and rhinomanometric resistance in the nasal airway after histamine challenge and after decongestion with xylometazoline, an a-adrenergic agonist. With histamine challenge, PIFn showed a smaller percent change than nasal resistance, and with xylometazo-line decongestion, PIFn showed a smaller percent change than nasal resistance. The authors concluded that PIFn was […]

21 Mar

Reproducibility of Nasal Peak Inspiratory Flow Among Healthy Adults: Discussion

The reproducibility of a test can be evaluated by repetition of the test in the same subject. This repetition may be conducted over minutes, over days, or over even longer intervals. Since the main utility of PIFn would be to measure acute reversible effects of air pollutants occurring in the environment, the reproducibility over days […]

19 Mar

Reproducibility of Nasal Peak Inspiratory Flow Among Healthy Adults: Distribution of Age, Height, PIFn, PIFm, and NOI Measurements

The distributions of age, height, PIFn, PIFm, and NOI are shown in Table 1. Since each subject had five daily measurements for peak flow over a week, the average of the five measurements was taken, and the distribution of those averages are presented in Table 1. Peak flow values and NOIs for FRC and RV […]

17 Mar

Reproducibility of Nasal Peak Inspiratory Flow Among Healthy Adults: Statistical Analysis

Statistical Analysis A nasal obstruction index (NOI) was calculated by the following formula: where PIFm is peak inspiratory flow through mouth and PIFn is peak inspiratory flow through nose. This index reflects the fraction of the reduction by the nasal airway segment of the flow into the trachea through mouth. This index is 1 if […]

15 Mar

Reproducibility of Nasal Peak Inspiratory Flow Among Healthy Adults: Nasal Peak Flow Measurement Procedure

Nasal Peak Flow Measurement Procedure A portable microspirometer (Micro Plus; London, UK) was used for the measurement of peak inspirator flows. For PIFn, a modified nasal continuous positive airway pressure mask wras attached to the spirometer. The masks were chosen to fit tightly on each subject’s face without touching the nose, and were cleaned with […]

13 Mar

Reproducibility of Nasal Peak Inspiratory Flow Among Healthy Adults: Materials and Methods

However, some authors have raised concerns that nasal peak flow measurements might be poorly reproducible. A result or measurement is said to be reproducible when the repetition of it gives the same results. Reproducibility is an essential characteristic of a test for utility in epidemiologic studies of inhaled pollutants. However, there has been little objective […]

11 Mar

Reproducibility of Nasal Peak Inspiratory Flow Among Healthy Adults

The responses of the respiratory tract to various air pollutants have been studied extensively. Although most studies have focused on the lower respiratory tract, recently, upper respiratory segments, including the nose and sinuses, have drawn attention either as a primary target organ of airborne pollutants or as an easily accessible part of the respiratory tract […]

© 2008 HIV/AIDS News & Information