SESSION TYPE: Sleep Posters
PRESENTED ON: Wednesday, October 24, 2012 at 01:30 PM - 02:30 PM
PURPOSE: To find out if the apnea link test (AL) is a reliable device for diagnosis or exclusion of OSA. To assess the correlation between AL and an overnight in-laboratory polysomnogram (PSG) performed at an accredited sleep laboratory, and to select a diagnostic apnea hypopnea index (AHI) cut off point on the AL that would reliably diagnose OSA.
METHODS: We designed a prospective study that included patients who were hospitalized with a variety of conditions (Congestive heart failure, COPD, asthma exacerbation, diabeties and sepsis) between July 2009 and July 2011, who had a high clinical suspicion for OSA, and an AL performed during their hospitalization. We compared the AHI on the AL to that obtained during PSG. The PSG was performed within 8 weeks of the AL test. The included patients had a minimum total recording time of > 3 hours on the AL, and > 2 hours of sleep on the PSG.
RESULTS: Sixty two patients met our inclusion criteria for the study. The mean age of subjects was 59 years and their mean body mass index was 37.2 kg/m2. Apnea link AHI was compared with the AHI obtained from the corresponding PSG. The diagnosis of OSA was chosen to be an AHI of 5 or more events/hr on PSG. The results revealed that AHI on AL correlated best to the diagnosis of OSA by PSG when it is 15 events or more per hour. The specificity was 100%, but sensitivity was 54%.
CONCLUSIONS: Although the PSG is currently the standard diagnostic test for OSA, our study concluded that AL may be useful not only for screening, but can also be considered for the diagnosis of OSA if AHI on an acceptable AL test is >15 events/hr.
CLINICAL IMPLICATIONS: AL test can be useful for the diagnosis of OSA.
DISCLOSURE: The following authors have nothing to disclose: Ayham Deeb, Salim Abou Jaoude, Mary Ann Winkle
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