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- W2142912891 abstract "The gold standard to measure UAC in children is the slope of pressure-flow (SPF) while applying a nasal pressure (PN).Studies have shown differences between controls and OSAS when it is applied a negative pressure in expiration (NEP) during wakefulness.Hypothesis: there is a relationship between NEP technique and SPF. We also evaluate differences in seated and supine. Methods: Controls (AHI [≤ 1.5/h) and OSAS (AHI ≥ 5/h). During wakefulness, NEP in sitting/supine was applied during 1st second of expiration. UA muscle activity was measured using intra-oral electrodes. The ratio of the area under the expiratory flow-volume curve during NEP compared to tidal breathing (RatioNEP) was calculated. Integrated EMG moving average area under the curve during NEP/basal was measured (RatioEMG). Both groups underwent pressure-flow measurements during sleep while wearing same intraoral electrodes.Two techniques were applied to decrease PN to subatmospheric, resulting in an activated and relatively hypotonic UA. The SPF in each states was correlated with RatioNEP in both positions (ANOVA). Results: 20 controls; 7 OSAS. In seated position we found an inverse relationship between RatioNEP and SPF in states hypotonic and active with respectively coefficient -8.9 and -12.1 (p" @default.
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- W2142912891 date "2014-09-01" @default.
- W2142912891 modified "2023-09-30" @default.
- W2142912891 title "Negative expiratory pressure technique correlates with the measurements of upper airway collapsibility (UAC) during sleep in children" @default.
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