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Emergency and Acute Medicine – Airway Management
Overview
Airway management encompasses techniques used to ensure adequate oxygenation and ventilation in critically ill or injured patients. It is a core skill in emergency medicine and includes basic airway maneuvers, airway adjuncts, definitive intubation, and surgical airway access. The priority is oxygenation and ventilation rather than intubation alone.
Basic Airway Adjuncts
Oral and nasopharyngeal airways lift the tongue off the hypopharynx and facilitate bag-valve-mask ventilation. Oropharyngeal airways require an absent gag reflex, whereas nasopharyngeal airways may be used when the gag reflex is intact.
Rapid Sequence Intubation (RSI)
RSI is the preferred ED method for oral intubation because it minimizes aspiration risk and optimizes intubating conditions through rapid induction and paralysis. It is contraindicated when paralysis is unsafe or when a difficult airway is anticipated without a reliable rescue plan. A preformulated backup strategy is essential.
Awake and Assisted Intubation Techniques
Awake oral intubation uses sedation without paralysis and is indicated when neuromuscular blockade is contraindicated. Ketamine is commonly used, often with benzodiazepines. A gum elastic bougie is helpful when vocal cords are poorly visualized, with tracheal placement suggested by tactile contact with tracheal rings.
Alternative Airway Devices
Extraglottic devices are inserted blindly into the oropharynx for rapid airway control. Laryngeal mask airways form a seal around glottic structures but provide less aspiration protection than endotracheal tubes. Intubating LMAs allow endotracheal tube placement. Esophageal–tracheal tubes such as the Combitube or King LT ventilate the hypopharynx while occluding the esophagus.
Advanced Visualization Techniques
Video laryngoscopes and fiberoptic devices improve visualization of the airway and are useful in patients with anatomic limitations or cervical spine instability. These techniques are less effective when blood or secretions obscure the airway and are contraindicated when immediate airway control is required.
Nasotracheal Intubation
Nasotracheal intubation is useful when oral access is impaired, oral intubation fails, or paralysis is contraindicated. Absolute contraindication is apnea. Relative contraindications include anticoagulation, massive facial trauma, upper airway abscess, epiglottitis, and penetrating neck injury.
Surgical Airways
Cricothyrotomy is the definitive rescue airway for failed intubation and ventilation. It is indicated in crash airways, massive facial trauma, or complete upper airway obstruction. Percutaneous translaryngeal ventilation may provide temporary oxygenation while preparing for cricothyrotomy.
Indications for Airway Intervention
Airway intervention is required when patients cannot maintain or protect the airway, develop hypoxia or ventilatory failure, or are expected to deteriorate. Common indications include altered mental status, status epilepticus, severe trauma, and the need for controlled ventilation during procedures.
Airway Assessment
A difficult airway should be anticipated using structured assessment such as the LEMON approach, evaluating external anatomy, mouth opening, mandibular and thyromental distance, Mallampati class, obstruction, and neck mobility. Early recognition guides appropriate technique selection and backup planning.
Verification of Tube Placement
Direct visualization of the tube passing through the vocal cords is the gold standard. End-tidal CO₂ monitoring is the most reliable bedside confirmation. Auscultation, chest rise, tube condensation, and pulse oximetry trends are supportive but less reliable. Chest radiography confirms depth and complications but does not exclude esophageal intubation.
Emergency Department Management
RSI requires thorough preparation, preoxygenation, appropriate positioning, and rapid confirmation of tube placement. Adequate postintubation sedation and, if needed, continued paralysis are essential. Failed attempts require immediate transition to alternative airway devices or surgical airway access.
Disposition
Most intubated patients require ICU admission. Rarely, selected patients intubated briefly for airway protection or diagnostic procedures may be extubated in the ED after observation and discharged safely.
Pearls and Pitfalls
Failure to ventilate is immediately life-threatening. Always assess for a difficult airway and establish a backup plan before intervention. Prioritize oxygenation and ventilation over intubation, and escalate early to alternative or surgical airway techniques when standard approaches fail.
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