Journal of sleep research
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Journal of sleep research · Dec 2011
Parental report of infant sleep behavior by electronic versus paper-and-pencil diaries, and their relationship to actigraphic sleep measurement.
Reliable, valid and cost-effective methods for the assessment of infant sleep and sleep problems are of major importance. In this study, the first aim was to assess the agreement of an electronic diary as well as a paper diary with actigraphy for measuring infant sleep patterns in a community sample. The second aim was to assess the feasibility and acceptance of, and compliance with, the electronic diary and the paper diary. ⋯ In addition, this study also found good agreement between both diaries and also between both diaries and actigraphy for sleep percentage over 24 h (electronic diaries and actigraphy: 54.1 ± 0.7%, 52.5 ± 0.7%, P < 0.05; paper diaries and actigraphy: 55.1 ± 0.5%, 52.2 ± 0.6%, P < 0.01) and for daytime (electronic diaries and actigraphy: 27.3 ± 0.9%, 23.5 ± 1.2%, P < 0.01; paper diaries and actigraphy: 27.3 ± 0.8%, 23.2 ± 1.0%, P < 0.01), with the exception that less daytime sleep was recorded on actigraphy than on either diary. In conclusion, the electronic diary and the paper diary are valid and well-accepted methods for the assessment of infant sleep. Parents preferred the electronic diary but, conversely, they were less compliant in completing it.
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Journal of sleep research · Dec 2011
Effects of the presence of hypertension on the relationship between obstructive sleep apnoea and sleepiness.
Obstructive sleep apnoea (OSA) plays a significant role in increasing blood pressure. Significant decreases were reported in blood pressure of hypertensive OSA patients with sleepiness who underwent continuous positive airway pressure (CPAP) treatment, but not in non-sleepy hypertensive OSA patients. More recently, however, significant decreases in blood pressure in non-sleepy hypertensive OSA patients following CPAP were shown. ⋯ Furthermore, the RDI was related negatively significantly to sleep duration in hypertensive subjects. Although short sleep duration was related significantly to sleepiness in both groups, hypertension may be important for the sleepiness in OSA patients. Detailed mechanisms of the difference in the relationship between sleepiness and the severity of OSA with or without hypertension should be studied further.
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Journal of sleep research · Dec 2011
Variability of human upper airway collapsibility during sleep and the influence of body posture and sleep stage.
The critical pressure at which the pharynx collapses (Pcrit) is an objective measurement of upper airway collapsibility, an important pathogenetic factor in obstructive sleep apnoea. This study examined the inherent variability of passive Pcrit measurement during sleep and evaluated the effects of sleep stage and body posture on Pcrit. Repeated measurements of Pcrit were assessed in 23 individuals (15 male) with diagnosed obstructive sleep apnoea throughout a single overnight sleep study. ⋯ This study has shown that the overall coefficient of repeatability was 4.1 cm H₂O, implying that the minimum detectable difference, with 95% probability, between two repeated Pcrit measurements in an individual is 4.1 cm H₂O. Such variability in overnight measures of Pcrit indicates that a single unqualified value of Pcrit cannot be used to characterize an individual's overall collapsibility during sleep. When within-subject variability is accounted for, change in body posture from supine to lateral significantly decreases passive pharyngeal collapsibility.
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Journal of sleep research · Jun 2011
Randomized Controlled Trial Comparative StudyNasal pillows as an alternative interface in patients with obstructive sleep apnoea syndrome initiating continuous positive airway pressure therapy.
Side-effects directly due to the nasal mask are common in patients with obstructive sleep apnoea syndrome (OSAS) commencing continuous positive airway pressure (CPAP). Recently, nasal pillows have been designed to overcome these issues. Limited evidence exists of the benefits and effectiveness of these devices. ⋯ The applied CPAP pressure did not correlate with compliance, AHI and ESS. Furthermore, no differences in outcome parameters were noted comparing groups with CPAP pressure <10 and ≥10cm H(2) O. Nasal pillows are equally effective in CPAP therapy, but do not generally lead to improved compliance.