Difficult intubation is challenging in intensive care units. There are limited data regarding risk factors of difficult intubation in ICU. The primary purpose of the investigators study is to assess the risk factors of difficult airway in adults in ICU.

PURPOSE: Intubation in ICU strongly differs from intubation in operative rooms. The results of studies about risk factors of difficult intubation performed in operative rooms cannot therefore be extrapolated directly to ICU.

The primary purpose of this trial (cf Part "Design" of this registration) is "other" and more particularly "Prognosis" because it is is an assessment of risk factors of difficult airway in intensive care units.

DESIGN AND METHODOLOGY: This is an open prospective multicentric study of intubation in ICU in more than 50 centres. Consecutive intubations will be included in each centre, in order to reach the sample size required (at least 1000 procedures intubations). The usual risk factors of difficult intubation in operative rooms, the demographic parameters and the complications of intubation will be assessed, as well as survival status at 28 days.

Inclusion Criteria:

• More or equal to 18 years old
• Men and women
• Informed patient
• Affiliated or benefit from an disease insurance
• Available for a 28 days follow-up
• Intubated patients in Intensive Care Unit

Exclusion Criteria:

• Law protected patients
• Opposed to participate to study