LAUSR

Introduction: Peripheral arterial tonometry (WatchPAT, Itamar Medical, Israel) is a portable diagnostic device using arterial tone to diagnose Obstructive Sleep Apnea (OSA). Its use is recommended by the American Academy of Sleep Medicine. Studies demonstrate a significant correlation with polysomnography in measuring Apnea Hypopnea Index (AHI) (r=0.87, p Aim: To compare watchPAT (WP) against LP in the diagnosis of OSA in a UK population. Method: Consecutive patients attending the lung function laboratory with suspected OSA were issued a home based overnight sleep examination using both LP and WP on the same night of testing . Intraclass correlation coefficient was used to test the strength of the relationship of data from the 2 devices. Results: 30 patients with suspected (OSA) were recruited between Aug and Nov 2016. 3 patients with poor data quality were excluded. 15 patients were male with a mean age 51.5±19.7 years. The mean AHI from LP was 10±17 and WP 15±20. There was a significant correlation between the devices for AHI, ODI and time spent with SpO2 Table 1: correlation between WP and LP parameters Conclusion: In patients with suspected OSA, the WatchPAT yielded similar results to LP, suggesting WP is as effective as LP in diagnosing OSA.