TY - JOUR T1 - How many times should overnight pulse-oximetry be undergone to screen obstructive sleep apnea syndrome? JF - European Respiratory Journal JO - Eur Respir J VL - 44 IS - Suppl 58 SP - P2207 AU - Kensuke Sumi AU - Tomomasa Tsuboi AU - Mio Yamashita AU - Hisako Tabata AU - Shigeki Sakai AU - Masayoshi Minakuchi AU - Susumu Oguri AU - Atsuo Sato Y1 - 2014/09/01 UR - http://erj.ersjournals.com/content/44/Suppl_58/P2207.abstract N2 - Background: Overnight pulse-oximetry has been used for screening obstructive sleep apnea syndrome (OSAS). However, there is no evidence about how many times overnight pulse-oximetry should be done to efficiently select subjects for further examination such as polysomnography (PSG).Methods: We recruited 89 subjects underwent both three consecutive night pulse-oximetry and one night PSG. Apnea hypopnea index (AHI) evaluated by PSG was compared to the largest 3% oxygen desaturation index (ODI3) measured by overnight pulse-oximetry. First, AHI was compared to ODI3 in the 1st night. Second, AHI was compared to larger ODI3 in the 1st and the 2nd nights. Finally, AHI was compared to the largest ODI3 in the 1st to the 3rd night. AHI more than 20 (events/hour) is used as a criterion for continuous positive airway pressure (CPAP) treatment in Japan. We set the cut off line ODI3 more than 10 (events/hour) to find out the patients with AHI more than 20.Results: When using the largest ODI3 in the 1st to the 3rd night, the sensitivity for finding out the subjects with AHI more than 20 was 91.9%, and when using larger ODI3 in the 1st and the 2nd nights, the sensitivity was equally 91.9%. When using ODI3 in the 1st night, the sensitivity was 75.7%.Conclusions: To select subjects for PSG adequately and economically, we should investigate overnight pulse-oximetry for two nights, and adopt the more serious result. ER -