Sedation for MRI Procedures in Adults

Sedative Options

• Propofol has a rapid onset and short elimination half-life, making it ideal for procedural sedation in MRI settings, with the American College of Cardiology recommending its use due to its shorter half-life and lower risk of delirium 1, 2, 3
• The European Heart Journal recommends propofol over benzodiazepines due to its shorter half-life and lower risk of delirium, with a strength of evidence supporting its use as a first-line sedative 3

Administration and Dosing

• The initial loading dose of propofol is 5 μg/kg/min over 5 minutes, with a maintenance dose of 5-50 μg/kg/min titrated to effect, as recommended by the Critical Care Medicine guidelines 2
• The initial loading dose of dexmedetomidine is 1 μg/kg over 10 minutes, with a maintenance dose of 0.2-0.7 μg/kg/hr, as recommended by the Critical Care Medicine guidelines 2

Safety Considerations

• Propofol may cause pain on injection, hypotension, respiratory depression, and rarely propofol-related infusion syndrome, with the Critical Care Medicine guidelines recommending caution when using this sedative 2
• Dexmedetomidine commonly causes bradycardia and hypotension, particularly with loading doses, with the European Heart Journal recommending its use with caution in patients at risk of hemodynamic instability 2, 3