Stationary Oxygen Concentrator with Built-in Respiratory Rate Monitor: Clinical Validation of Its Efficacy in Patients with Interstitial Lung Disease and Chronic Obstructive Pulmonary Disease

Objective The respiratory rate (RR) can be monitored continuously using a HiSanso^®i, a stationary oxygen concentrator with a built-in respiratory sensor. To examine the efficacy of this device, we compared its performance with that of polysomnography in inpatient settings and the home sleep apnea test (HSAT) in residential settings for patients with interstitial lung disease (ILD) and chronic obstructive pulmonary disease (COPD). Methods The oxygen flow rate was set at 1, 3, and 5 L/min in inpatient settings and 1-3 L/min (conditions similar to the home surroundings) in residential settings. Intraclass correlation coefficients (ICCs) (2,1) were calculated to determine the agreement between the RR measured with the HiSanso^®i and that measured with polysomnography or the HSAT. The minimum acceptable reliability level is 0.7. Results In total, 14 (10 with ILD and 4 with COPD) and 5 (all with ILD) patients were assessed in inpatient and residential settings, respectively. In inpatient settings, the detection rate of patients' respiration measured with the HiSanso^®i was 77.0% and 73.3% in patients with ILD and COPD, respectively. At oxygen flow rates of 1, 3, and 5 L/min, the ICCs (2,1) were 0.91, 0.85, and 0.91, respectively, for patients with ILD and 0.96, 0.90, and 0.74, respectively, for patients with COPD. In residential settings, the detection rate of patients' respiration measured with the HiSanso^®i was 86.6%, and the ICC (2,1) was 0.97. Conclusion The HiSanso^®i accurately monitored the RR without any additional devices, independent of oxygen flow rates or disease status.