Outcome Measures : The primary objective of this non-invasive, non-interventional study is to show that the establishment of a titration algorithm for sedation and analgesia administered by nurses is more beneficial to the patient than the use of such a drug without a suitable regimen. The goal is to improve the quality of our painkillers and sedative drugs use needed in the intensive care environment in order to decrease the morbidity and mortality associated with it, without altering patient comfort and tolerance to the environment. For this we propose to collect a database including patient demographic details, pharmacological information and any possible complications during the ICU stay as well as a distant assessment exploring the psychological complications (3, 6 months and 1 year). The primary endpoint will be the duration of mechanical ventilation, and secondary endpoints, the length of stay in ICU and in hospital, mortality and other complications.