Compare the Efficacy and Outcome Between Fentanyl and Morphine as Analgo-sedation in Mechanically Ventilated Patients

Researchers will randomize patients into 2 groups (Fentanyl and Morphine) and will start study drug accordingly for sedation in ICU.Proportion of patients from each group achieving targeted sedation score at 12 and 24 hours following initiation of the drug and proportion of patients from each group requiring rescue sedation dose will be recorded and analyzed.

Furthemore duration of mechanical ventilation, length of ICU stay and 14 days mortality rate will recorded and compared between this 2 groups of patients.

Inclusion criteria

• Age >18 years old
• Patients who are expected by the ICU team to require invasive mechanical ventilation in ICU for at least more than 24 hours and for whom the ICU team decides to initiate continuous infusion of sedation
• A patient who was ventilated and sedated not more than 12 hours before ICU admission.

Exclusion criteria

• Patients with chronic use of narcotics
• Patients with chronic liver failure or end-stage renal failure
• Patients with severe chronic neurocognitive dysfunction
• Patients with drug overdose
• Patients with a known allergy to either morphine or fentanyl
• Patients who are receiving neuromuscular blockers
• Patients who are pregnant
• Patients who are diagnosed to have severe traumatic brain in