RT Journal Article SR Electronic T1 Non-contact Doppler radar screening system for the detection of COPD JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 546 DO 10.1183/13993003.congress-2020.546 VO 56 IS suppl 64 A1 Hiroki Nishine A1 Hiroki Takamoto A1 Guanghao Sun A1 Shohei Sato A1 Takeo Inoue A1 Takemi Matsui A1 Masamichi Mineshita YR 2020 UL http://erj.ersjournals.com/content/56/suppl_64/546.abstract AB Background: Chronic Obstructive Pulmonary Disease (COPD) is characterized by irreversible airflow obstruction and commonly assessed by pulmonary function tests. A previous epidemiology report states that the prevalence of airflow limitation in Japan is higher than previously reported, suggesting a higher degree of under-diagnosed COPD. Thus, enhanced screening efforts are needed for earlier interventions and treatment.Objectives: To evaluate the efficacy of a Doppler radar screening system for the detection of COPD.Methods: A newly developed non-contact COPD screening system (COPD-SS) incorporates a Doppler radar with 10mW-low output power. COPD-SS radiates 24 GHz imperceptible microwaves from a distance of 35cm from the thorax. COPD-SS monitors motion in real-time by receiving reflected microwaves from the thorax. COPD-SS then converts thoracic motion into a single waveform.We measured forced vital capacity (FVC) using spirometry in patients simultaneously with COPD-SS. We calculated the change of chest displacement in 1 second then divided by the total motion of the thorax. We then compared the ratio of forced expiratory volume in one second to forced vital capacity (FEV1/FVC) with COPD-SS data.Results: COPD screening was performed on 58 COPD patients and 26 normal control subjects. Of these, 37 patients and 16 control subjects underwent COPD screening analysis. The percentage of chest displacement in 1 second was significantly correlated with FEV1/FVC (r=0.775, P<0.0001) in all subjects. COPD-SS revealed a high accuracy rate (86.7%) in the detection of airflow limitation.Conclusions: COPD-SS appears promising as an efficient screening system for the detection of COPD.FootnotesCite this article as: European Respiratory Journal 2020; 56: Suppl. 64, 546.This abstract was presented at the 2020 ERS International Congress, in session “Respiratory viruses in the "pre COVID-19" era”.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).