1Department of Respiratory and Sleep Disorders Medicine, Western Hospital, The University of Melbourne, Australia.
2Department of Medicine, Western Hospital, The University of Melbourne, Australia.
Address for Correspondence: Dr David Cunnington, MMedSc FRACP FCCP FAASM, Department of Respiratory and Sleep Disorders Medicine, Western Hospital,Gordon St, Footscray, VIC 3011, Australia, Phone: +61 3 8345 6842; Fax: +6139318 6342, email: david.cunnington@wh.org.au
Objective: This study aimed to evaluate the accuracy of the portable SomtéTM (Compumedics Limited, Melbourne, Australia) sleep data acquisition device against the current gold-standard of technician-attended, laboratory-based polysomnography (PSG) for the diagnosis of sleep disordered breathing (SDB).
Methods: Patients attending the sleep disorders laboratory for overnight PSG for the evaluation of suspected SDB were fitted with both the Somté device and a PSG system (Compumedics ESeries). An apnea-hypopnea index (AHI) was calculated after manual scoring of respiratory events recorded using the Somté and PSG systems.
Results: 37 patients (29 male, 8 female) participated in the study. The mean difference between the AHI estimated by the two devices showed good agreement, with the Somté device AHI being similar to that obtained by PSG. Mean difference (PSG - Somté AHI), −0.5 events per hour (95% CI −4.4 to 5.4, p=0.83). The Somté device was able to correctly classify the presence or absence of SDB (defined as PSG AHI e”15) with a sensitivity of 96%, specificity of 83%, positive predictive value of 92% and a negative predictive value of 91%.
Conclusion: The Somté device accurately detects respiratory events during sleep and can be used to diagnose SDB in patients referred for the evaluation of sleep disordered breathing.
obstructive sleep apnea, polysomnography, diagnosis, ambulatory monitoring, physiologic monitoring
