Effects of pentobarbital on upper airway patency during sleep

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Effects of pentobarbital on upper airway patency during sleep.

We hypothesised that pentobarbital would improve upper airway mechanics based on an increase in latency to arousal and amplitude of the phasic genioglossus electromyogram (EMG), and a decrease in the active upper airway critical closing pressure (P(crit)). 12 healthy subjects received pentobarbital (100 mg) or placebo in a double-blind, crossover protocol. During wakefulness, we measured the ge...

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The pathophysiological mechanisms involved in obstructive sleep apnoea (OSA) are complex and not fully understood. Critical upper airway (UA) narrowing/collapse usually occurs in the oropharynx, between the nasal choanae and epiglottis, an area lacking rigid support. Patency of this vulnerable segment is dependent on the action of pharyngeal dilator and abductor muscles that are normally activa...

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Twenty four preterm infants (median birth weight 1120 g and gestation 29 weeks) were studied on 83 occasions by measuring upper airway airflow. Airway patency was detected by the transmission of cardiac impulse up the airway and airway closure by its absence. A total of 309 apnoeas of at least five seconds' duration were recorded. One hundred and eighty (58.0%) were central, 109 (35.5%) mixed, ...

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The purpose of our study was to compare inspiratory- and expiratory-related changes in retropalatal cross-sectional area (CSA) during wakefulness to those during non-rapid-eye-movement (NREM) sleep. We studied 18 subjects in whom the severity of sleep-disordered breathing varied. Relative changes in CSA were visualized by using fiber-optic endoscopy. For each breath analyzed (wakefulness n = 4-...

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ژورنال

عنوان ژورنال: European Respiratory Journal

سال: 2009

ISSN: 0903-1936,1399-3003

DOI: 10.1183/09031936.00153809