What is the correct sequence for administering etomidate, rocuronium, fentanyl, and propofol during rapid sequence intubation?

Rapid Sequence Intubation Drug Sequence

Yes, your sequence is correct: administer etomidate and rocuronium together (or in rapid succession), perform intubation, then start fentanyl and propofol infusions for post-intubation sedation and analgesia.

The Standard RSI Sequence

The proper RSI medication sequence follows this algorithmic approach 1:

Step 1: Induction Agent + Neuromuscular Blocker (Simultaneously or Rapid Succession)

• Etomidate 0.2-0.3 mg/kg IV push 1
• Rocuronium 0.6-1.2 mg/kg IV push 2

These should be given together or within seconds of each other. The 2023 SCCM guidelines suggest no difference between etomidate and other induction agents regarding mortality or hypotension 1, though etomidate has the most favorable hemodynamic profile in critically ill patients.

Timing: Intubation should occur at 60-90 seconds after rocuronium administration 2. Rocuronium 0.6 mg/kg provides excellent-to-good intubating conditions in median time of 1 minute, with most patients intubated within 2 minutes 2.

Step 2: Perform Intubation

Wait for adequate neuromuscular blockade before laryngoscopy (typically 60-90 seconds).

Step 3: Post-Intubation Sedation and Analgesia

After successful intubation, immediately start:

• Fentanyl infusion or boluses for analgesia
• Propofol infusion for ongoing sedation

Critical Timing Considerations

Do NOT give fentanyl and propofol before intubation in standard RSI. Here's why:

• Fentanyl given pre-induction can cause chest wall rigidity, respiratory depression, and hypotension 3
• Propofol has the most profound hypotensive effect of all induction agents and should not be used as the primary induction agent in hemodynamically unstable patients 1
• The entire point of RSI is rapid administration of induction + paralytic followed immediately by intubation

Common Pitfalls to Avoid

1. Wrong medication order: Never give propofol as your induction agent in critically ill/unstable patients—use etomidate or ketamine instead 1

2. Inadequate post-intubation sedation: Many patients receive inadequate or delayed post-intubation sedation after receiving rocuronium 4. Start your fentanyl/propofol infusions immediately after tube confirmation.

3. Dosing errors with rocuronium: For rapid sequence intubation, you need 0.6-1.2 mg/kg rocuronium 2. Lower doses (0.45 mg/kg) take longer and may not provide adequate conditions at 60 seconds.

4. Forgetting the paralytic wears off: Rocuronium 0.6 mg/kg provides approximately 31 minutes of paralysis 2. If your post-intubation sedation is inadequate, the patient will wake up paralyzed—a nightmare scenario.

Alternative Considerations

If the patient is severely hemodynamically unstable, consider:

• Ketamine 1-2 mg/kg instead of etomidate (though recent evidence suggests etomidate may cause less hypotension than ketamine in shock/sepsis 5)
• Lower etomidate dose (0.15 mg/kg) in severe hemodynamic compromise 1

The evidence shows no mortality difference between etomidate and other induction agents 1, but propofol causes the most hypotension and should be reserved for hemodynamically stable patients 1.