- Published on
Emergency and Acute Medicine – Airway Adjuncts
Overview and Purpose
Airway adjuncts are devices used to support and maintain upper airway patency when normal airway reflexes or anatomy compromise ventilation and oxygenation. In emergency and acute care, they are frequently used as rescue techniques when standard endotracheal intubation is difficult or when effective bag-mask ventilation cannot be achieved. Their primary goal is to ensure adequate oxygenation and ventilation while a definitive airway is established.
Types of Airway Adjuncts
Airway adjuncts include oral and nasopharyngeal airways as well as extraglottic devices. Oral and nasopharyngeal airways function by lifting the tongue away from the posterior pharynx, relieving obstruction. These devices are typically used in conjunction with proper patient positioning. Nasopharyngeal airways may be used when the gag reflex is intact, whereas oropharyngeal airways require an absent gag reflex to avoid vomiting or aspiration.
Extraglottic Airway Devices
Extraglottic devices are divided into supraglottic and retroglottic or infraglottic devices. Supraglottic devices sit above and surround the glottis, while retroglottic or infraglottic devices ventilate at the level of the hypopharynx and occlude the esophagus. These devices are usually inserted blindly using device-specific techniques. Although they have high success rates and allow rapid airway control, they offer less protection from aspiration than endotracheal tubes.
Epidemiology and Clinical Context
Most emergency department airway interventions are successful with the first selected method, with overall intubation success approaching 98%. Difficult airways account for a small but clinically significant proportion of cases, underscoring the importance of airway adjuncts within a structured airway management plan.
Assessment of the Difficult Airway
Airway assessment is essential prior to intervention. Predictors of difficult bag-mask ventilation include poor mask seal, obesity or airway obstruction, advanced age, edentulous state, and reduced chest wall compliance. Predictors of difficult laryngoscopy and intubation include abnormal external anatomy, limited mouth opening, short mandibular or thyromental distance, higher Mallampati class, airway obstruction, and limited neck mobility. Early recognition guides appropriate selection of adjuncts and backup strategies.
Confirmation of Airway Placement
Effective airway management should result in stable or improving oxygen saturation. End-tidal capnography is the most reliable bedside method to confirm correct airway placement. Physical examination findings such as chest rise, auscultation, and tube condensation are commonly used but are less reliable. Chest radiography is helpful after endotracheal intubation to confirm tube depth and identify complications, but it does not exclude esophageal intubation.
Prehospital and Initial Emergency Management
Prehospital airway options vary by system and may include bag-valve-mask ventilation with adjuncts, endotracheal intubation, extraglottic device placement, or surgical airway access. Initial emergency department management prioritizes oxygenation, cervical spine protection when indicated, and vascular access for resuscitation and medication administration.
Emergency Department Airway Management
Rapid sequence intubation is a cornerstone of definitive airway control. Preparation includes assembling suction, oxygen delivery systems, primary and rescue airway devices, and medications. Preoxygenation, optimal positioning, and postintubation confirmation are critical. If intubation fails, clinicians must promptly transition to alternative airway adjuncts or surgical airway techniques rather than persisting with repeated unsuccessful attempts.
Disposition and Follow-Up
Nearly all patients requiring advanced airway management, particularly intubation, require admission to an intensive care unit or operating room for ongoing care. Rarely, selected patients may be extubated in the emergency department after observation and safely discharged.
Pearls and Pitfalls
Failure to ventilate is immediately life-threatening. Every patient should be assessed for potential airway difficulty, and a backup plan must always be in place. The priority is effective oxygenation and ventilation rather than intubation alone. Early transition to airway adjuncts or surgical airway techniques is essential when conventional methods fail, especially in pediatric patients where anatomical considerations are critical.
0 Comments
