Rapid Sequence Induction - Anesthesia Checklist and Essentials

Key Points

• RSI is an aspiration-risk strategy, not simply a faster version of routine induction.
• Predicted severe airway difficulty can make awake intubation safer than RSI.
• Preoxygenation quality strongly influences safe apnea time.
• Hemodynamic resuscitation and vasopressor preparation should precede induction in shock.
• Gentle mask ventilation can be appropriate when hypoxemia risk outweighs theoretical aspiration concerns.
• Cricoid pressure should not be allowed to impair oxygenation or laryngoscopy.
• Rocuronium and succinylcholine each have distinct contraindications and tradeoffs.
• Waveform capnography is the standard confirmation of tracheal placement.

Algorithm

1. Confirm aspiration indication and evaluate difficult-airway risk.
2. Assign roles and prepare suction, primary device, rescue ventilation, vasopressor, and invasive-airway equipment.
3. Optimize position, preoxygenation, and hemodynamics.
4. Select induction and neuromuscular-blocking drugs according to physiology and contraindications.
5. Administer induction and paralytic in rapid sequence while maintaining oxygenation strategy.
6. Perform first-pass intubation with the best available operator and device.
7. Confirm with sustained waveform capnography.
8. Treat post-intubation hypotension and hypoxemia and begin ongoing sedation and ventilation.

Clinical Synopsis & Reasoning

RSI is commonly used for emergency surgery with a full stomach, bowel obstruction, active vomiting, severe reflux with aspiration risk, trauma with uncertain fasting, and critically ill patients requiring rapid airway control. The technique must be adapted to physiologic reserve. A septic or hemorrhaging patient may arrest from a standard induction dose, while a severely hypoxemic patient can desaturate before laryngoscopy despite technically flawless preparation.

Before induction, evaluate airway difficulty and decide whether RSI is actually safer than awake intubation. A patient with a predicted impossible airway and aspiration risk may be safer with an awake technique that preserves spontaneous ventilation. Gather suction, primary and backup laryngoscopy devices, bougie or stylet, supraglottic rescue, vasopressors, and emergency front-of-neck equipment. Position obese patients head-elevated and use the most effective preoxygenation available, including noninvasive ventilation when severe hypoxemia warrants it.

Historical RSI included no mask ventilation and routine cricoid pressure. Contemporary practice is more nuanced. Gentle low-pressure mask ventilation during the apneic period can reduce hypoxemia in selected patients without clearly increasing aspiration when performed correctly. Cricoid pressure remains controversial and should be released if it worsens laryngoscopy or ventilation. The goal is safe oxygenation, minimal aspiration exposure, and rapid successful tracheal intubation.

Treatment Strategy & Disposition

Correct immediately reversible physiology before induction when time permits. Give fluid or blood for true hypovolemia and prepare a vasopressor for shock. Preoxygenate to end-tidal oxygen targets when measurable or for several minutes with a tight seal; use nasal oxygen during apnea when helpful. Choose an induction drug based on hemodynamics and neurologic context. Etomidate provides relative cardiovascular stability, ketamine is useful in many unstable patients but can still cause hypotension when catecholamine stores are depleted, and propofol often requires substantial dose reduction in shock.

Use a rapid neuromuscular blocker. Succinylcholine has fast onset but important contraindications including hyperkalemia risk from denervation, major burns after the early period, certain neuromuscular diseases, and malignant hyperthermia susceptibility. Rocuronium at RSI dosing provides rapid conditions without those potassium or MH concerns, but paralysis lasts longer unless reversed with sugammadex. Ensure sedation and analgesia continue after intubation because paralysis does not provide unconsciousness.

Confirm tracheal placement with continuous waveform capnography. Immediately reassess blood pressure and oxygenation because post-intubation hypotension is common and dangerous. Start lung-appropriate ventilation, gastric decompression when indicated after airway security, and post-intubation sedation. If the first attempt fails, restore oxygenation and move to the predefined difficult-airway pathway rather than repeating the same attempt.

Epidemiology / Risk Factors

• RSI is widely used in emergency anesthesia and critical care.
• Peri-intubation hypoxemia and hypotension are common in critically ill patients.
• Aspiration risk depends on gastric content and physiology, not only clock time since eating.
• First-pass success is associated with fewer airway complications.

Investigations

Common Pitfalls

Pharmacology

Prognosis / Complications

• Well-prepared RSI can provide rapid airway control with low aspiration risk.
• Severe post-intubation hypotension and hypoxemia worsen outcomes in critically ill patients.
• Repeated attempts increase airway trauma and aspiration exposure.
• Post-intubation care is as important as insertion of the tube.

Patient Education / Counseling

• In emergencies, explain that anesthesia and airway control may need to proceed despite incomplete fasting.
• Patients with known prior difficult intubation should disclose it before any future emergency or elective procedure.
• After aspiration, discuss possible pneumonia or lung injury monitoring.
• After a difficult airway, provide documentation of the successful technique.
• Elective patients should follow fasting instructions exactly but tell the team about vomiting, reflux, or delayed gastric emptying.

Notes

Modern RSI is best understood as a bundle that reduces aspiration exposure while preserving oxygenation and hemodynamic stability. Older dogma such as absolute prohibition of mask ventilation should not override the immediate danger of desaturation.

Drug choice matters less than matching dose and pharmacology to the patient. No induction agent can compensate for unrecognized hemorrhagic shock or a missing rescue-airway plan.

References

1. 2022 ASA Practice Guidelines for Management of the Difficult Airway — Link
2. ASA Standards and Practice Parameters — Link