Endotracheal intubation (ETI) is a potentially life-threatening procedure for critically ill patients and major severe complications such as severe hypoxia, cardiovascular collapse and cardiac arrest are common. Despite the high risk of the procedure, different interventions lack high-quality evidence and the investigators hypothesize that a heterogeneous practice among different centres and geographical areas may be found.

The investigators designed a large international observational study aiming at prospectively collecting data on the current impact of ETI-related adverse events and current airway management practice in critically ill patients. Investigators will collect data on all consecutive in-hospital (intensive care unit, emergency department and wards) ETIs performed in adult critically patients.

This study aims at prospectively collecting data on the current morbidity and mortality of ETI-related adverse events and current airway management practice in adult critically ill patients. Investigators designed a large international study calling for participation all institutions caring critically ill patients worldwide.

Inclusion criteria

Investigators will include all adult (≥ 18 years old) critically ill patients undergoing intubation during the period of observation. Investigators will consider all in-hospital intubations. Critically ill will be defined those patients with a life-threatening condition requiring intubation for either cardiorespiratory failure or airway protection.

Exclusion Criteria

• Intubation performed in the out-of-hospital setting
• Intubation during cardiac arrest
• Intubation performed for anaesthesia

Primary Outcome

Major ETI-related adverse events - composite outcome (severe hypoxemia, cardiac arrest and cardiovascular collapse - see further for definitions)

Secondary Outcomes

Minor ETI-related adverse events and ICU mortality (see further for definitions).

Sample size

Investigators' aim is to collect data from 1000 intubation- related major complications. From a previously published report (Jaber 2006) the expected incidence of at least one major complication is 28%. Therefore investigators plan to recruit data from 3600 endotracheal intubations. Intubation rate may vary from 0.5 to 2 ETIs/day according to different centres (e.g. total hospital beds, number of ICUs and ICU beds) and local policies. Each centre will be asked to collect data from 20 ETIs. A maximum time window of 8 weeks will be allowed for each centre (i.e. for centres with a slower recruitment rate, data collection will stop after 8 weeks irrespective of total number of ETIs collected data). Investigators plan to recruit at least 180 centres worldwide.

Inclusion Criteria:

• Critically ill patients undergoing in-hospital endotracheal intubation.

Exclusion Criteria:

• Intubation performed in the out-of-hospital setting;
• Intubation during cardiac arrest;
• Intubation performed only for anaesthesia.

We will include all adult (≥ 18 years old) critically ill patients undergoing intubation during the period of observation. We will consider all in-hospital intubations. We will define critically ill those patients with a life-threatening condition requiring intubation for either cardiorespiratory failure or airway protection.