The goal of this observational study is to evaluate the feasibility of a systematic screening protocol for Obstructive Sleep Apnea (OSA) during preoperative anesthesia consultations in adults aged 50 and older undergoing elective surgery. The main questions it aims to answer are:

• Does the systematic screening protocol increase the proportion of patients identified as being at high risk for OSA compared to standard care?
• What is the impact of systematic screening on postoperative outcomes, including complications, length of stay, and mortality?

Researchers will compare standard care practices (before implementation) to the systematic screening protocol (after implementation) to determine the effect on OSA detection rates and clinical outcomes.

Participants will:

• Complete the STOP-BANG questionnaire during their anesthesia consultation.
• (Optional) Have a facial photograph taken to analyze morphometric characteristics that may correlate with OSA risk.
• Be referred for further diagnostic testing if identified as high-risk for OSA.

Inclusion Criteria:

• All patients with a national health identifier affiliated with the social security system, aged over 18, including French individuals over 50 years old, in scheduled anesthesia consultation with STOP BANG > 5 or > 4 with BMI > 35

Exclusion Criteria:

• Refusal to participate in the study, age under 50, not affiliated with the social security system, minor or under legal protection

All patients with a STOP BANG > 5 or > 4 associated with an obesity (BMI > 35 kg/m2)