Abstract
Background: Chronic Obstructive Pulmonary Disease (COPD) is characterized by irreversible airflow obstruction as demonstrated by pulmonary function tests. COPD is currently the third leading cause of death in the world. In a previous epidemiology report, the prevalence of airflow limitation in Japan is higher than previously reported, suggesting a high degree of under-diagnosis for COPD. Enhanced screening efforts are needed for earlier interventions and treatment. Currently, a non-contact tool for quantitative measurement of respiratory tidal volume using Doppler radar for COPD patients has yet been reported.
Objectives: To evaluate the efficacy of a Doppler radar screening system for the detection of COPD.
Methods: The newly developed non-contact COPD screening system (COPD-SS) incorporates a 24GHz Doppler radar with 10mW-low output power. COPD-SS radiates 24 GHz imperceptible microwaves, which penetrates through clothes, from a distance of 35cm from the thorax. The COPD-SS monitors the motion of the thorax in real time by receiving reflected microwaves from patient’s thorax. The COPD-SS estimates tidal volume from thorax motion using a predetermined tidal volume calibration curve. Patients performed spirometry maneuvers, measuring forced vital capacity (FVC) simultaneously with COPD-SS screening system.
Results: We conducted COPD screening for 13 patients and 7 normal control subjects. The change of tidal volume in 1 second by COPD-SS was significantly correlated with forced expiratory volume in 1 second (FEV1) / FVC (r=0.83, P<0.0001).
Conclusions: Preliminary data reveals COPD-SS appears efficient for detecting COPD easily.
Footnotes
Cite this article as: European Respiratory Journal 2019; 54: Suppl. 63, PA783.
This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).
- Copyright ©the authors 2019
