The objective of this study was to compare the results of oxygen desaturations and sleep apnoea during a daytime nap (D) versus nocturnal sleep (N) evaluation, recorded by a portable multichannel monitoring device in patients with a clinical suspicion of obstructive sleep apnoea (OSA). Two polysomnographic studies were performed, by means of the Healthdyne NightWatch System, in 82 subjects (mean age 57.9 years). No difference was found in the apnoea + hypopnoea index (AHI) and mean SaO2 between D and N recordings. At an AHI threshold of 20, in the D recordings, compared to the N ones, the sensitivity was 91% and the specificity 100%. A good correlation was found for AHI and oxygen desaturation index (ODI) between the two experimental conditions (r = 0.89 and 0.79, respectively). Our study shows that D recordings seem to be accurate for OSA diagnosis in the majority of patients with a clinical suspicion of sleep apnoea syndrome.
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