Opioid administration in mechanically ventilated patients in the intensive care unit (ICU) is essential to maintaining patient respiratory and hemodynamic stability. Mechanical ventilation is a persistently nociceptive event that can continuously causes discomfort in the trachealy intubated patient. This can lead to patient-ventilator dyssynchrony, tachycardia, hypertension, and their associated complications. Opioids blunt respiratory drive, which facilitates mechanical ventilation, and decrease the sympathetic response to nociception. However, excessive opiate administration is associated with many adverse events, including respiratory depression, delirium, ileus, nausea, and vomiting. Currently, the standard administration in our institution of sufentanil, a potent opiate, consists of continuous infusions of 0.15µg/kg/h to 0.3µg/kg/h.

Mechanically ventilated patients are unable to speak and are often sedated. This greatly impacts the patient's capacity to communicate pain. The use of a nociceptive monitor may be a possible solution. Skin conductance monitoring (Pain Monitor, Med-Storm, Norway), measures the peaks per second of electrical conduction. This non hemodynamic monitor uses skin conduction as a surrogate to nociception (i.e., the patient's unconscious response to a noxious stimulus). It may consequently guide opioid administration in ICU patients towards and avoid the consequences of excessive or inadequate antinociception.

Inclusion Criteria:

• Adult patient admitted to the ICU requiring endotracheal intubation, antinociception, and sedation

Exclusion Criteria:

• Traumatic brain injury
• use of ketamine, dexmedetomidine, or clonidine
• pregnancy