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Multicenter Study
. 2018 Feb 23;13(2):e0192789.
doi: 10.1371/journal.pone.0192789. eCollection 2018.

Validation of the portable Air-Smart Spirometer

Cristina Ramos Hernández  1   2 , Marta Núñez Fernández  1 , Abel Pallares Sanmartín  3 , Cecilia Mouronte Roibas  1   2 , Luz Cerdeira Domínguez  1 , Maria Isabel Botana Rial  1   2 , Nagore Blanco Cid  3 , Alberto Fernández Villar  1   2
Affiliations
Multicenter Study

Validation of the portable Air-Smart Spirometer

Cristina Ramos Hernández et al. PLoS One. .

Abstract

Background: The Air-Smart Spirometer is the first portable device accepted by the European Community (EC) that performs spirometric measurements by a turbine mechanism and displays the results on a smartphone or a tablet.

Methods: In this multicenter, descriptive and cross-sectional prospective study carried out in 2 hospital centers, we compare FEV1, FVC, FEV1/FVC ratio measured with the Air Smart-Spirometer device and a conventional spirometer, and analyze the ability of this new portable device to detect obstructions. Patients were included for 2 consecutive months. We calculate sensitivity, specificity, positive and negative predictive value (PPV and NPV) and likelihood ratio (LR +, LR-) as well as the Kappa Index to evaluate the concordance between the two devices for the detection of obstruction. The agreement and relation between the values of FEV1 and FVC in absolute value and the FEV1/FVC ratio measured by both devices were analyzed by calculating the intraclass correlation coefficient (ICC) and the Pearson correlation coefficient (r) respectively.

Results: 200 patients (100 from each center) were included with a mean age of 57 (± 14) years, 110 were men (55%). Obstruction was detected by conventional spirometry in 73 patients (40.1%). Using a FEV1/FVC ratio smaller than 0.7 to detect obstruction with the Air Smart-Spirometer, the kappa index was 0.88, sensitivity (90.4%), specificity (97.2%), PPV (95.7%), NPV (93.7%), positive likelihood ratio (32.29), and negative likelihood ratio (0.10). The ICC and r between FEV1, FVC, and FEV1 / FVC ratio measured by the Air Smart Spirometer and the conventional spirometer were all higher than 0.94.

Conclusion: The Air-Smart Spirometer is a simple and very precise instrument for detecting obstructive airway diseases. It is easy to use, which could make it especially useful non-specialized care and in other areas.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Air Smart Spirometer.
After 6 seconds of exhalation the chronometer turns green.
Fig 2
Fig 2. Bland and Altman graphs.
Fig 3
Fig 3. Correlation graphs.
See this image and copyright information in PMC

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