The rapid economic and population growth, increase in constructions, a small selection of appropriate soil resources Kuwait have made it necessary to research stabilization methods because the existing soils are currently unsuitable their natural conditions. In this study, consolidation characteristics sabkha samples southern mixed with 0%, 4%, 8%, 10% bitumen respect dry weight were investigat...

AIM To identify the clinical predictors and assist surgeons in their clinical management of obstructive sleep apnoea (OSA) - a prospective study with a new approach to analyse the static and dynamic upper airway morphology between patients with OSA and normal subjects. To introduce a new method of assessment for surgical outcome. MATERIALS AND METHODS Quantitative computer-assisted videoendos...

Abstract Introduction Long term CPAP therapy alters OSA endotypes (e.g., reduces loop gain and the arousal threshold). However, while oral appliance (OAT) is known to improve upper airway collapsibility, its effects on non-anatomical are unclear. Methods To investigate of OAT polysomnographic estimates we studied 102 people with (AHI=34±20 events/h) pre vs. post-treatment (following 4-6 weeks a...

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The pharyngeal airway is surrounded by soft tissues that are also enclosed by bony structures such as the mandible, maxilla, and cervical spine. The passive pharyngeal airway is therefore structurally analogous to a collapsible tube within a rigid box. Cross-sectional area of the tube is determined by transmural pressure, the pressure difference between intraluminal and extraluminal pressures. ...

The present study measured hypotonic pharyngeal collapsibility in subjects not known to have obstructive sleep apnoea (OSA), and assessed the variables that affect collapsibility and the relationship with OSA. The critical value of positive end-expiratory pressure (P(crit)) was measured under the hypotonic condition of anaesthesia in 227 subjects who underwent elective surgery. The risk of OSA ...

Obstructive sleep apnea involves intermittent periods of airway occlusions that lead to repetitive oxygen desaturations. Exposure to chronic intermittent hypoxia (IH) in rats increases diurnal blood pressure and alters skeletal muscle physiology. The impact of IH on upper airway muscle function is unknown. We hypothesize that IH exposure increases upper airway collapsibility in rats due to alte...