Chest
Clinical InvestigationsPulmonary Function Electronic Monitoring Devices: A Randomized Agreement Study
Section snippets
Instruments
The PiKo-1 is a monitoring device that uses a patented pressure/flow sensor technology for PEF and FEV1 measurement. Is a low-cost, pocket-size, easy-to-use device that can storage 96 measurements with date and time stamp, plus test-quality alerts indicating an abnormal blow or cough. It can measure PEF in the range of 15 to 999 L/min with a 1 L/min resolution and an accuracy of 6.5% or 15 L/min, whichever is greater. The measurement of FEV1 has a range of 0.15 to 9.99 L (0.01-L resolution) and
Results
Thirty-eight patients were included. Their demographic characteristics, height, weight, smoking status, FEV1, and PEF descriptive data are presented in Table 1. All individuals were white; 23 patients (61%) had asthma. Twenty-five patients (66%) had previous experience of using PEF meters, and 16 patients (42%) remembered performing spirometry previously.
Mean Asthma Control Questionnaire scores were 0.58 (SD, 0.51; minimum, 0; maximum, 1.83) for asthmatics and 0 (SD, 0; minimum and maximum, 0)
Main Findings
We have shown a very good reproducibility and an excellent agreement with an office pneumotachograph and both pulmonary function electronic monitoring devices. Additionally, we confirmed the low accuracy and the nonlinear response of the Mini-Wright PFM. The best agreement with the pneumotachograph was observed for PiKo-1 FEV1, and the worst was observed for Mini-Wright PEF.
The inadequate performance of the Mini-Wright PFM is consistent with the observations of other studies.17, 18, 19, 22 In
Conclusion
The low-cost and easy-to-use electronic monitoring devices tested showed a very good reproducibility and were in agreement with the pneumotachograph. Therefore, they seem adequate both for screening and monitoring. However, prospective studies are needed to assess long-term reproducibility, usability, and especially the effects on the improvement of respiratory care.
ACKNOWLEDGMENT: We thank participants for their cooperation, Ms. Sandra Gomes for assisting with data collection, Dr. Cristina
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Reproduction of this article is prohibited without written permission from the American College of Chest Physicians (www.chestjournal.org/misc/reprints.shtml).
Participating institutions (Hospital São, Joao and Faculdade de Medicina da Universidade do Porto) provided all the financial support for this study.