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Free Content Under reporting of sleepiness and driving impairment in patients with sleep apnoea/hypopnoea syndrome

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SUMMARY

Under reporting of symptoms by patients with sleep apnoeal/hypopnoea syndrome (SAHS) has been reported anecdotally, but investigation of the prevalence or determinants of this is limited. To assess this, repeated ratings in 99 patients with sleep apnoea/hypopnoea syndrome of pre-treatment Epworth sleepiness score, unintended napping, driving impairment and mood were obtained, first at presentation and then after treatment with continuous positive airway pressure (CPAP) therapy of median 22 (range 2-70) weeks duration. Median Epworth score for pre-treatment sleepiness rose from 12 (range 0-24) initially to 14 (range 5-24) retrospectively (P<0.0001). More patients initially under-rated Epworth score (67%) than over-rated (29%; P0.001). ‘False negative’ cases with an initially ‘normal’ (≤ 10) and retrospectively ‘sleepy’ (≥ 11) Epworth score comprised 24% of all patients and 62% of initially ‘normal’ scorers. Unintended napping behaviour also was rated as significantly more severe on retrospective assessment (P<0.001). Driving impairment due to sleepiness was initially reported by 23% of all drivers and retrospectively by 37% (P=0.01), with 25% of initial deniers retrospectively admitting compromised driving ability before continuous positive airway pressure. No polysomnographic predictors of symptom under reporting were found (P 0.1). These results suggest a high prevalence of symptom minimization before treatment in patients with sleep apnoea/hypopnoea syndrome.
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Keywords: CPAP; automobile accidents; sleep apnoea/hypopnoea syndrome; sleepiness

Document Type: Regular Paper

Affiliations: Respiratory Medicine Unit, Department of Medicine (RIE), University of Edinburgh, UK

Publication date: 1997-12-01

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