Assessment of a wrist-worn device in the detection of obstructive sleep apnea

Objective: To assess the accuracy of a wrist-worn device (Watch_PAT100) to diagnose obstructive sleep apnea (OSA). Methods: Thirty adult subjects with and without suspected OSA simultaneously had a standard in-laboratory polysomnogram (PSG) and wore the Watch_PAT100 during a full-night recording. PSG sleep and respiratory events were scored according to standard criteria. Watch-PAT data were analyzed with an automated computerized algorithm which calculated the frequency of respiratory events per hour of actigraphy measured sleep using a combination of peripheral arterial tonometry (PAT) signal attenuation, desaturation on pulse oximetry, and changes in heart rate. This yielded a PAT apnea hypopnea index (AHI). Results: Mean age was 47.0 +/- 14.8 years, mean body mass index 31.0 +/- 7.6 kg/m(2), mean PSG AHI 23 +/- 23.9 events per hour, and mean PAT AHI 23 +/- 15.9 events per hour. There was a significant correlation between PAT AHI and AHI by PSG (r = 0.87, P < 0.001). To assess sensitivity and specificity of Watch_PAT, we constructed receiver operator characteristic curves using a variety of AHI threshold values (10, 15, 20, and 30 events per hour). Optimal combinations of sensitivity and specificity for the various thresholds were 82.6/71.4, 93.3/73.3, 90.9/84.2, and 83.3/91.7, respectively. Conclusions: The Watch-PAT is a device that can detect OSA with reasonable accuracy. Thus, the Watch-PAT may be a useful method to diagnose OSA. (C) 2003 Elsevier B.V. All rights reserved.