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Sleep apnea syndrome (OSA) frequently occurs in obese population undergoing bariatric surgery. There is a need for alternative screening tools for sleep apnea detection in the pre-operative period. The investigators would like to compare ApneaLink and complete polysomnography in this population.

OSA can occur in up to 78% of patients undergoing bariatric surgery(1). Moderate to severe case will benefit from CPAP therapy, that can help avoiding post-operative complications(2).

In this population, the investigators propose complete attended in-hospital polysomnography (PSG)in patients with a clinical high probability of OSA.

According to obesity epidemics (3), waiting list for PSG in sleep labs is every day longer.

The investigators want to assess sensitivity and specificity of a new portable screening tool, ApneaLink, to detect OSA in a bariatric population.

Design:

monocentric and prospective study

Methods:

Patients:

- OSA suspicion based on :

• symptoms and signs (snoring, apneas , neck circumference >38 (women) or 43cm (men))
• BMI > 50
• BMI > 40, > 40 y
• BMI > 35, men, hypertension
• increased serum Bicarbonate
• Polyglobulia

Measurements

• Polysomnography in sleep lab with concommitant recording performed with Apnea LinkTM (nasal flow and oxymétry recording).
• between 2 weeks : recording performed with Apnea LinkTM (nasal flow and oxymétry recording)at home.

Inclusion Criteria:

• obese patients
• > 18 years old
• in whom a bariatric surgery is planified and who have to undergo a polysomnography for OSA screening

Exclusion Criteria:

• pulmonary, neurologic, neuromuscular disease
• < 18 years old

obese patients, > 18y old, in whom a bariatric surgery is planified and who have to undergo a polysomnography for OSA screening