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Difficulty: MediumSurgical and Procedural Interventions

A 58-year-old man is evaluated in the emergency department for worsening respiratory distress. He has a history of chronic obstructive pulmonary disease (COPD) and was brought in by ambulance after his wife found him gasping for air. On arrival, his blood pressure is 150/90 mm Hg, heart rate is 122/min, and oxygen saturation is 84% on room air. Physical examination reveals accessory muscle use, diffuse wheezing, and paradoxical abdominal breathing. Despite initiation of noninvasive positive-pressure ventilation and continuous bronchodilator therapy, the patient's mental status rapidly declines. The physician decides to proceed with rapid sequence intubation (RSI). Arrange the following procedural steps for RSI in the most appropriate chronological sequence.

  1. 1Preoxygenate the patient with 100% oxygen to maximize the safe apnea time.
  2. 2Administer an intravenous sedative induction agent followed by a paralytic agent.
  3. 3Perform laryngoscopy to visualize the vocal cords and glottic opening.
  4. 4Advance the endotracheal tube through the cords and inflate the distal cuff.
  5. 5Verify proper tube placement utilizing end-tidal carbon dioxide (ETCO2) capnography.

Answer

The correct sequence for rapid sequence intubation (RSI) is: 1) Preoxygenate, 2) Administer induction then paralytic agents, 3) Perform laryngoscopy, 4) Advance the tube and inflate the cuff, 5) Verify placement with ETCO2.
The sequence of rapid sequence intubation (RSI) is strictly protocolized to minimize the risk of aspiration and maximize physiological reserve during the apneic period. The correct sequence follows the standard phases: preoxygenation, pretreatment (if any), paralysis with induction, positioning/laryngoscopy, placement, and proof of placement. First, preoxygenation with 100% FiO2 washes out alveolar nitrogen, creating an oxygen reservoir that prolongs the safe apnea time. Second, an intravenous induction agent is administered immediately followed by a rapid-acting paralytic agent; this ensures the patient is unconscious prior to neuromuscular blockade. Once the patient is fully relaxed, direct or video laryngoscopy is performed to obtain a view of the glottic opening. The endotracheal tube is then advanced through the vocal cords, and the cuff is inflated to secure the airway. Finally, immediate confirmation of intratracheal placement is obtained using continuous waveform capnography (end-tidal CO2 detection), which is the gold standard for verifying endotracheal intubation.

Step-by-Step Solution

1
Preoxygenate the patient with 100% oxygen.
Nitrogen is washed out of the alveoli, creating a pulmonary oxygen reservoir.
This establishes a buffer to prevent hypoxemia during the necessary apneic period that follows the administration of paralytics.
2
Administer a rapid-acting sedative induction agent immediately followed by a neuromuscular blocking agent.
The patient loses consciousness, followed rapidly by complete flaccid muscle paralysis.
Sedation must strictly precede paralysis to prevent the psychological trauma of conscious paralysis. Paralysis is required to relax the airway musculature for intubation.
3
Perform laryngoscopy to visualize the glottic opening.
The vocal cords are directly identified.
Direct visualization ensures that the endotracheal tube is guided properly into the trachea and not into the esophagus.
4
Advance the endotracheal tube and inflate the securing cuff.
The airway is definitively established and sealed.
The inflated cuff holds the tube in place and provides a mechanical barrier against the aspiration of gastric contents.
5
Confirm tube placement using end-tidal CO2 (capnography).
Definitive proof of tracheal intubation is obtained.
Clinical signs (like auscultation) are unreliable. Capnography is the gold standard for recognizing and preventing unrecognized esophageal intubations.

Key Concept

Rapid Sequence Intubation (RSI) Algorithmic Sequence

Alternative Method

In a 'crash airway' scenario where a patient presents in profound cardiac arrest or is deeply comatose and apneic, the sedation and paralysis steps (RSI medications) are completely bypassed, and immediate direct laryngoscopy and intubation are performed.
Estimated Time:1m 30s
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Topics

Surgical and Procedural Interventions

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