TY - JOUR T1 - Correlation of total sleep time (TST) by SenseWear Armband (SWA®) and nocturnal polysomnography (NPSG), in a population with and without OSA JF - European Respiratory Journal JO - Eur Respir J VL - 40 IS - Suppl 56 SP - P901 AU - A. O'Brien AU - A. McGowan AU - L. Stewart AU - K. Fennell AU - K. Bolger AU - J. Faul AU - L. Cormican Y1 - 2012/09/01 UR - http://erj.ersjournals.com/content/40/Suppl_56/P901.abstract N2 - Portable devices that determine TST may act as an adjunct to level 3 diagnostic tests for OSA. The SWA is such and measures TST using a proprietary algorithm. Calculation of TST could improve the accuracy of a level 3 diagnostic device.Aim: Correlation of TST by SWA and NPSG, in a population with and without sleep apnoea.89 consecutive patients undergoing NPSG because of a suspicion of OSA wore an SWA on the same night. Patients were stratified by the presence and severity of OSA. Correlation coefficient for TST were determined between SWA and NPSG for all subjects and in the OSA subgroups.The prevalence of a normal PSG, mild moderate and severe OSA was 22 (24.7%), 31 (34.8%), 12 (13.4%) and 24 (26.9%) of 89 subjects. and the respective correlation coefficients were r=0.68, 0.74, 0.85 and 0.25. Clinically important differences are presented with Bland Altman plots (Fig. 1 & 2).Correlation of TST between the two methods was weakest in those with severe OSA. The determination of TST by SWA in a population with severe OSA is likely to be unreliable. NPSG remains the gold standard for determination of TST. ER -