Introduction

Chronic obstructive pulmonary disease is a chronic respiratory disease caused mainly by smoking. It is the third leading cause of death in the world.

Its diagnosis and longitudinal follow-up are based on respiratory function tests. The AirSmart spirometer is a new ultra-portable and inexpensive device that performs spirometric measurements connected to a smartphone or tablet via Bluetooth.

The objective of the study is to evaluate the accuracy and validity of these measurements compared to a conventional desktop spirometer.

Materials and methods:

Our epidemiological study is prospective made in the department of pulmonology CHU of Fez on healthy volunteer patients and others followed for respiratory diseases, aged 40 years and over, over one year from 11 May 2021 to 05 June 2022. An informed consent was signed by all participants.

Results:

We have 296 patients with a mean age of 59.49 years, 113 (38.2%) are male. 39.6% of patients had an FEV1/FVC ratio < 0.7 in the Air Smart-spirometer obstruction test.

The agreement and correlation between the parameters of the two devices were evaluated by calculating the Pearson correlation coefficient(r) and the interclass correlation coefficient (ICC).

The sensitivity and specificity of the Air Smart in detecting obstruction were 89.3 and 74.6%, respectively with a positive predictive value of 65.2% and negative predictive value of 92.9%.

The limits of agreement on the Bland and Atman curves reflecting good agreement.

Conclusion:

Our results support the use of the Air Smart as a reliable spirometer for the screening and diagnosis of various spirometric patterns in clinical practice and for individual follow-up in the patient's home