Rapid Sequence Induction Protocol for Standard Adult Patients
Core RSI Technique
Administer a sedative-hypnotic agent followed immediately by a neuromuscular-blocking agent, then place the endotracheal tube before initiating assisted ventilation. 1 This approach reduces aspiration risk and improves first-pass intubation success in patients requiring emergency airway management. 1
Patient Positioning
- Position the patient in semi-Fowler position (head and torso elevated 20-30 degrees) rather than supine during RSI. 1 This improves oxygenation and may reduce aspiration risk, though the evidence quality is limited. 1
- Maintain head in neutral position after tube placement; neck flexion advances the tube deeper while extension may withdraw it. 2
Pre-Oxygenation Protocol
Standard Approach
- Pre-oxygenate with 100% oxygen (FiO₂ 1.0) for 3-5 minutes using a completely sealing face mask with oxygen flow >10 L/min. 3, 4
- Target end-tidal oxygen concentration (FetO₂) >0.9 to maximize oxygen reserves. 3
- Monitor with continuous capnography during pre-oxygenation. 3
High-Risk Modifications
- Use high-flow nasal oxygen (HFNO) when difficult laryngoscopy is anticipated to provide apneic oxygenation during the intubation attempt. 1
- Apply non-invasive positive-pressure ventilation (NIPPV) for pre-oxygenation in patients with severe hypoxemia (PaO₂/FiO₂ <150). 1
- Consider medication-assisted pre-oxygenation (delayed-sequence intubation) in selected patients who cannot tolerate standard pre-oxygenation. 1
Pharmacologic Protocol
Opioid Administration
- Administer an opioid prior to induction in the majority of patients (65.9% of practitioners do this). 4 This reduces the required dose of hypnotic agent and minimizes hemodynamic side effects. 5, 6
Hypnotic Agent Selection
For hemodynamically stable patients:
For hemodynamically unstable patients:
- Ketamine or etomidate are preferred over propofol to avoid cardiovascular collapse. 7
- Thiopental remains an alternative option. 3
Neuromuscular Blocking Agent
Primary recommendation:
- Rocuronium is now first-line (used by 54.7-56% of practitioners), particularly when sugammadex is available for reversal if needed. 3, 4, 7
Alternative:
- Succinylcholine remains acceptable if no contraindications exist (e.g., burns >24 hours old, hyperkalemia risk). 8, 3, 7
- Succinylcholine has largely been replaced by rocuronium in contemporary practice due to its superior safety profile. 7
Critical point: A neuromuscular blocking agent must be administered during RSI to optimize intubating conditions and prevent coughing/choking. 1, 3
Cricoid Pressure (Sellick Maneuver)
- Cricoid pressure use is controversial and declining. Only 38.5% of practitioners routinely use it, while 37.4% do not. 4
- If applied, release it promptly if it interferes with tube passage. 1
- Modern evidence suggests cricoid pressure may be unnecessary except when active regurgitation is observed. 7
Ventilation During RSI
- Gentle manual ventilation with inspiratory pressure <12 cmH₂O is used by 35.5% of practitioners and appears safe when desaturation risk is high. 4, 7
- Traditional RSI avoided all ventilation, but contemporary practice recognizes that gentle ventilation post-induction is beneficial in preventing hypoxemia, particularly in critically ill patients. 7
Intubation Technique
- Videolaryngoscopy is recommended over direct laryngoscopy as it improves first-pass success rates. 8
- Use a bougie if the glottic view is suboptimal. 8
- First-pass success is critical (currently ~84%); complications increase exponentially with multiple attempts. 7
Immediate Confirmation
- Waveform capnography is mandatory to confirm tracheal placement. 2 However, capnography does not exclude right mainstem intubation. 2
- Assess bilateral chest expansion and breath sounds in both axillae. 2
- Obtain chest radiography to verify mid-tracheal tube position and exclude right mainstem intubation (malposition occurs in 12-28% of cases). 2
Failed Airway Management
- If severe hypoxemia persists after one or more attempts, immediately transition to front-of-neck airway (FONA). 8
- Use a second-generation supraglottic airway device as a rescue if unexpected difficult airway is encountered. 3
- Prepare for rapid scalpel-bougie-tube FONA technique; narrow-bore cricothyrotomy may be insufficient in critically ill patients. 1
Hemodynamic Management
- Optimize hemodynamics before, during, and after intubation with proactive use of vasopressors or inotropes as needed. 1
- Desaturation, hypoxemia, and hemodynamic instability pose greater risks than aspiration itself in critically ill patients (aspiration occurs in only 3-6% of cases). 7
Team Preparation
- Conduct team briefings with standardized checklists and clearly defined roles before intubation. 1
- Limit equipment to the primary device and one alternative to reduce errors from unfamiliarity. 1
- Expertise and competence of the physician minimize aspiration risk. 3
Critical Pitfalls to Avoid
- Do not assume adequate pre-oxygenation in critically ill patients; pulmonary shunt limits effectiveness and rapid desaturation is common. 1
- Physical examination alone detects tube malposition in only 3% of cases compared to 14-28% by radiography. 2
- Do not delay transition to FONA when intubation fails; procedural hesitation causes greater morbidity than the procedure itself. 8
- Avoid repeated intubation attempts without reassessing oxygenation and considering alternative strategies. 7