The Modern Guide to Rapid Sequence Induction (RSI): Protocol, Drugs & Safety
Rapid Sequence Induction (RSI) is widely regarded as one of the most critical skills in an anesthesia provider's arsenal. Whether you are an Anesthesia Technologist assisting in the ER or managing a full stomach case in the OT, understanding the precise choreography of RSI is the difference between a secured airway and a catastrophic aspiration event.
In this comprehensive guide, we will break down the 7 Ps of RSI, compare the latest drug protocols (Rocuronium vs. Succinylcholine), and provide you with a printable checklist for your daily practice.
What is RSI?
Rapid Sequence Induction (or Intubation) is a specialized medical procedure designed to secure the airway as quickly as possible while minimizing the risk of regurgitation and aspiration of gastric contents. Unlike a standard induction, positive pressure ventilation (bag-mask ventilation) is typically avoided until the endotracheal tube is confirmed in the trachea.
The "Full Stomach" Rule
RSI is the gold standard for patients presumed to have a "full stomach." This includes:
- Non-fasted patients (Emergency trauma)
- Pregnant women ( > 2nd trimester)
- Patients with GERD (Gastroesophageal Reflux Disease)
- Diabetics with gastroparesis
- Bowel obstruction cases
The 7 Ps of RSI: A Visual Protocol
Success in RSI depends on preparation. The mnemonic "7 Ps" structures the timeline of the procedure.
Preparation (T-10 mins)
"SOAP ME" Checklist: Suction (on and working), Oxygen (flow high), Airway (ETT, Laryngoscope, Bougie), Pharmacy (Drugs drawn), Monitoring (ECG, SpO2, BP), Equipment.
Preoxygenation (T-5 mins)
Nitrogen washout. Provide 100% Oxygen for 3-5 minutes via a tight-fitting mask. The goal is an EtO2 > 90%. This buys you "apneic time" safety.
Pretreatment (T-3 mins)
Administer adjuncts to blunt physiological responses.
Examples: Fentanyl (blunts sympathetic surge), Lidocaine (blunts cough reflex).
Paralysis with Induction (T-0)
Simultaneous administration of a sedative (Induction agent) and a neuromuscular blocking agent (NMBA). Push the sedative, follow immediately with the paralytic.
Positioning & Protection
Apply Cricoid Pressure (Sellick’s Maneuver) if per institutional protocol (note: this is controversial in 2025 guidelines). Position the head in the "sniffing position" unless C-Spine injury is suspected.
Placement with Proof (T+45 sec)
Perform laryngoscopy and intubation. Confirm placement immediately with Capnography (EtCO2). This is the only reliable sign of correct placement.
Post-Intubation Management
Secure the tube, initiate mechanical ventilation, check vitals, and administer long-term sedation/analgesia.
RSI Pharmacology: The Big Debate
Choosing the right drugs is as important as the technique itself. Here is a breakdown of the most common agents used in modern anesthesia.
1. Induction Agents (The Sleep)
| Drug | Dose (IV) | Best For | Watch Out For |
|---|---|---|---|
| Propofol | 1.5 - 2.5 mg/kg | Standard hemodynamically stable patients. | Hypotension (Drops BP significantly). |
| Ketamine | 1 - 2 mg/kg | Asthma (Bronchodilator) & Shock (Stable BP). | Increased secretions, hallucinations. |
| Etomidate | 0.3 mg/kg | Cardiac patients (Cardiac Stable). | Adrenal suppression (sepsis risk). |
2. Paralytics (The Relaxation)
The debate between Suxamethonium (Succinylcholine) and Rocuronium is ongoing. In 2025, Rocuronium is gaining favor due to fewer side effects, provided Sugammadex is available for reversal.
Succinylcholine (Sux)
Dose: 1 - 1.5 mg/kg
Onset: Fastest (30-45 sec)
Duration: Short (5-10 min)
Contraindications: Hyperkalemia, Burns (>24hrs), Renal Failure, MH History.
Rocuronium (Roc)
Dose: 1.2 mg/kg (RSI Dose)
Onset: Fast (45-60 sec)
Duration: Long (45-60 min)
Reversal: Sugammadex (if available).
Technologist's Corner: The "SOAP ME" Checklist
As an anesthesia technologist, your role is ensuring the equipment never fails. Memorize this checklist.
[Image of anesthesia machine workstation equipment check]Conclusion
Mastering RSI requires practice, communication, and a deep understanding of pharmacology. By following the 7 Ps and maintaining a rigorous equipment checklist, you minimize risks and ensure patient safety during the most vulnerable moments of anesthesia.
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