reflection objectives: Laboratory-based spirometry is the "gold standard" for the assessment of lung function.
reflection objectives: Laboratory-based spirometry is the "gold standard" for the assessment of lung function, the one and the other in clinical and research protocols. These spirometers, however, are neither practical nor affordable for home-based monitoring or studies that bring together data in multiple locations. Traditionally, peak flowmeter have been used, nevertheless they have important limitations.
Design: Based onward data from a cohort of 92 children with asthma, we evaluated the agreement between a portable spirometer and a office-based spirometer, using an in-line technique to evaluate measures from the same effort. We compared a range of pulmonary function parameters deduceed during office-based tests, and also evaluated whether adequate adherence and data quality could be achieved in a home-based reflection of children with asthma.
Results: The agreement between the devices for the actual values of peak expiratory pour FE[V.sub.1], and forced expiratory come at 25% of FVC was of the highest order The portable device was programmed with customized software to grade each crook using revised American Thoracic Society acceptability and reproducibility criteria. For 74% of the winds quality grade agreed with a grade assigned by means of physician review of the bend from the office-based spirometer. During 2 weeks of twice-daily monitoring at hearthstone children completed an average of 23 of 28 possible sessions (83%) Of these, 84% had at least sum of two units acceptable and two reproducible bend s Although children [greater than or equal to] 8 years antique were not more adherent, they were significantly more likely to achieve acceptable and reproducible curves
Conclusions: Portable spirometers can provide measurements that are highly comparable to those obtained from "gold standard" laboratory spirometers, and high-quality tracings can be achieved the couple at home and in the office setting. Visual inspection of the inflects by experienced reviewers identified unacceptable bend s that were not rejected through the quality control software. Portable spirometers are an important contribution to epidemiologic and clinical studies that require haunt measures of a more broad range of pulmonary function parameters than can be provided by means of peak flowmeters.
lock opener words: pediatric asthma pulmonary function testing; spirometry panel studies
Abbreviations: ATS = American Thoracic Society; FACES = Fresno Asthmatic Children's Environment Study; FE[Fsub25-75] = forced expiratory issue between 25% and 75% of FVC; FE[Fsub75] = forced expiratory liquefy at 75% of FVC; PEF = peak expiratory flow
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Laboratory-based spirometry is the "gold standard" for the assessment of lung function in children with asthma, the one and the other in clinical and research protocols. owing to technician and equipment sumptuousnesss however, peak flowmeters often are used for domestic circle monitoring of lung function of children with asthma in clinical settings and epidemiologic studies. of the like kind use of peak flow measurement has been advocated through the National Asthma Education and Prevention Program. The value of these measurements is limited, however, because peak expiratory pour (PEF) is effort dependent and solely reflects flows of the large airways in contrast to FE[Vsub1] and forced expiratory emanate between 25% and 75% of FVC (FE[F25-75]) which characterize the be deriveds in both the large and small airways. It has been shown that peak flowmeter recordings are not highly reproducible, and are no better at predicting asthma exacerbations than monitoring symptoms alone. (1-4) Portable spirometers have the ability to garner a wide range of pulmonary function parameters that are more clinically and epidemiologically useful, in that they are more sensitive to changes in functional status in asthma. (5)
brace studies (6,7) have evaluated the practicality and validity of hearthstone spirometry in children with asthma. Unfortunately, neither research validated the device used through comparison with a "gold standard," laboratory-based spirometer. Although the pair studies examined adherence and reproducibility of efforts in the abode setting, neither study mentions the use of quality direct measures to ensure acceptability of efforts prior to evaluation of their reproducibility.
We performed a direct comparison of a portable spirometer (EasyOne; ndd Medical Technologies; Andover, MA) with an office-based convolution spirometer (model RS232; Morgan Scientific; Winchester, MA), based forward an in-line technique to simultaneously measure forced expiratory maneuvers from one as well as the other instruments. The acceptability of each inflect was determined independently for each device. Customized quality check software was used to determine the acceptability of bend s obtained by the portable spirometer. The acceptability of turns generated on the office-based spirometer was initially determined from the technician and underwent further independent review on three physicians experienced in the interpretation of spirometry (A.F., J RB I.B.T.). Volume-time and flow-volume bend s were reviewed. The curves from each effort in a given session were considered during the review. Any differences in interpretation were resolv according to consensus. The agreement between the sum of two units methods of acceptability grading was compared. Additionally, a 2-week place of abode study using only the portable spirometer was performed with the same children to assess adherence and the acceptability and reproducibility of efforts.
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