Final answer:
The Esophageal Tracheal Combitube (ETC) is designed for gastric decompression after insertion. It is unique among the most commonly used airway adjuncts because it serves both as an esophageal obturator and a tracheal airway, allowing for decompression.
Step-by-step explanation:
The airway adjunct specially designed to allow for gastric decompression after insertion is the Esophageal Tracheal Combitube (ETC) or Option 3. The ETC is a dual-lumen airway device that serves as both an esophageal obturator airway and a tracheal airway. Its design includes a feature that permits gastric decompression, which reduces the risk of aspiration during emergency airway management. Unlike the nasopharyngeal airway or oropharyngeal airway, which do not offer this feature, and unlike the Laryngeal Mask Airway (LMA), which is primarily focused on providing airway patency rather than decompression, the ETC is specifically intended for scenarios where gastric decompression is necessary.