Comparing the Sedative Effect of Dexmedetomidine and Propofol in Mechanically Ventilated Patients Using Salivary Alpha-Amylase as a Stress Marker: A Randomized Open-Label Trial.

Background: Patients receiving mechanical ventilation (MV) in the intensive care unit (ICU) experience significant distress, which triggers a stress response. Objectives: This study aimed to assess the effectiveness of dexmedetomidine and propofol in reducing stress levels, using salivary alpha-amylase (SAA) as a specific indicator of stress. Methods: A randomized, open-label trial was conducted involving 40 patients newly placed on MV. In a parallel study design, participants were randomly assigned into two equal groups (n = 20) through the sealed envelope method using computer-generated randomization. Group D received dexmedetomidine at a dosage of 0.2 to 1.4 μg/kg/h, while group P received propofol at a dosage of 0.3 to 4 mg/kg/h for sedation. Salivary alpha-amylase levels were measured according to the kit manufacturer's protocol. Results: Salivary alpha-amylase levels were significantly lower in group D than in group P at 12, 24, 36, and 48 hours after the initiation of MV (P < 0.05). Heart rate and mean arterial pressure were also significantly lower in group D at 12, 18, and 24 hours (P < 0.05). The duration of MV was significantly shorter in group D compared to group P (4.4 ± 1.85 vs 6.1 ± 2.45 days, P = 0.018). There were no significant differences in ICU length of stay, mortality, or adverse events between the groups. Conclusions: Dexmedetomidine demonstrated superior stress-reducing effects compared to propofol in MV patients, as evidenced by lower SAA levels and improved hemodynamic stability. The shorter duration of MV in the dexmedetomidine group further suggests potential clinical benefits of its use in managing stress in MV patients.