The study is a prospective field evaluation to assess the therapeutic value of the CPAP/autoCPAP Sandman in 24 new diagnosed Obstructive Sleep Apneic patients.

Precisely, the study was designed to :

• evaluate the therapeutic efficacy of the CPAP/autoCPAP Sandman device in improving sleep quality and normalozing respiratory events
• determine the sensitivity and specificity of the device in adequately detecting respiratroy events
• compare effective pressure Peff determined by the device and during manual titration
• compare the impact of the two-speed descent pressure algorithm

During the study, each patient underwent one night of full polysomnography with two consecutives therapeutic sequences during the same night, after randomization of the passage order:

• autotitrating pressure phase: sleep parameters and respiratory events vs results of the polysomnographic registration,
• manual titration phase: concordance between events respiratory analyzed on the polysomnographic recordings and the events detected by the CPAP / auto-CPAP.

Inclusion Criteria:

• patient male or female, aged 18 to 75 years
• weight > 30kg
• patient with a newly diagnosed OSAS, under treatment with CPAP
• patient in stable condition
• patient affiliated to a social security insurance
• having given its written informed consent to participate to the study

Exclusion Criteria:

• pneumothorax or pneumomediastin history
• massive epistaxis (current or previous)
• decompensated heart failure or hypotension
• pneumoencephal history, recent trauma or surgery sequel with cranio-nasopharyngeal fistula
• acute sinusitis history, middle ear infection or perforation of the tympanic membrane
• respiratory insufficiency or severe respiratory illness with the possibility of residual hypoxemia
• severe bullous emphysema or previously complicated pneumothorax
• severe claustrophobia