The purpose of the study is to assess the dying process in critically ill patients with decision to withdraw invasive mechanical ventilation in anticipation of death and to compare effects of extubation and those of terminal weaning of mechanical ventilation on relatives and care givers. The investigators primary hypothesis is that extubation is associated with less symptoms of post-traumatic stress disorders in relatives, as compared to terminal weaning.

Inclusion Criteria:

• End of life decision to withdraw invasive mechanical ventilation after at least 48 hours of ICU stay

Exclusion Criteria:

• Age under 18 years
• Non invasive mechanical ventilation
• Brain death
• Death before withdrawal of mechanical ventilation
• No French-speaking relative
• Refusal of relative to participate the study

Patients admitted in ICU with end of life decision to withdraw invasive mechanical ventilation after at least 48 hours of ICU stay