الفهرس 
Chapter 1: Sleep physiologyOnly 14 pages are availabe for public view
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Abstract
Sleep apnea is a sleep disorder characterized by recurrent episodes of complete absence (apnea) or reduction (hypopnea) of airflow through the upper airway during sleep resulting in oxygen desaturations and arousals.(1) Tri-level adaptive servoventilation (Tri-level ASV) therapy is a new method of ventilator support that was proposed to improve breathing during the cyclic breathing phases by providing anticyclic pressure support.(7) Tri-level adaptive servo ventilation uses three different pressure levels over the course of the breathing cycle. The inspiratory positive airway pressure (IPAP) pressure provides the inspiratory push and ventilation. Expiratory pressure is varied between a lower level at the start of expiration (expiratory positive airway pressure) and a higher level at the end of expiration (end-expiratory positive airway pressure) to provide a splint for airway.(5)
The aim of this present prospective clinical trial was to assess the role of Tri-level adaptive servoventilation in the management of patients with sleep apnea syndrome in a purpose of applying this mode as a treatment modality.
The present study was carried out on 20 patients diagnosed as OHS and OSAHS referred to the Sleep Laboratory Unit in the Chest Department at Menoufia University Hospital in the period from January to September 2017.
Patients were excluded if they had a history of cerebrovascular accident, altered mental status, unstable angina, history of injury or surgery within 6 months prior to the study, significant facial trauma,