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dc.contributor.authorKhor, Yet Hen
dc.contributor.authorTolson, Jen
dc.contributor.authorChurchward, Thomas Jen
dc.contributor.authorRochford, Peter Den
dc.contributor.authorWorsnop, Christopher Jen
dc.identifier.citationInternal Medicine Journal 2015; 45(8): 850-853en
dc.description.abstractHome polysomnography (PSG) is an alternative method for diagnosis of obstructive sleep apnoea (OSA). Some types 3 and 4 PSG do not monitor sleep and so rely on the patient's estimation of total sleep time (TST). The study compared patients' subjective sleep duration estimation with objective measures in patients who underwent type 2 PSG for probable OSA.A prospective clinical audit of 536 consecutive patients of one of the authors between 2006 and 2013. A standard questionnaire was completed by the patients the morning after the home PSG to record the time of lights being turned off and estimated time of sleep onset and offset. PSG was scored based on the guidelines of the American Academy of Sleep Medicine.Median estimated sleep latency (SL) was 20 minutes compared to 10 minutes for measured SL (p < 0.0001). There was also a significant difference between the estimated and measured sleep offset time (median difference = -1 minute, p = 0.01). Estimated TST was significantly shorter than the measured total sleep time (median difference = -18.5 minutes, p =0.002). No factors have been identified to affect patients' accuracy of sleep perception. Only 2% of patients had a change in their diagnosis of OSA based on calculated AHI.Overall estimated TST in the patients with probable OSA was significantly shorter than measured with significant individual variability. Collectively, inaccurate sleep time estimation had not resulted in significant difference in the diagnosis of OSA.en
dc.subject.otherApnoea-hypopnoea indexen
dc.subject.otherobstructive sleep apnoeaen
dc.subject.othersleep latencyen
dc.subject.othertotal sleep timeen
dc.subject.othertype 2 polysomnographyen
dc.titlePatients' estimates of their sleep times: reliability and impact on diagnosis of obstructive sleep apnoea.en
dc.typeJournal Articleen
dc.identifier.journaltitleInternal Medicine Journalen
dc.identifier.affiliationDepartment of Respiratory and Sleep Medicine, Austin Health, Heidelberg, Victoria, Australiaen
dc.identifier.affiliationInstitute for Breathing and Sleep, Austin Health, Heidelberg, Victoria, Australia-
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