They cause less gastric insufflation or aspiration than BVM or laryngeal mask (LMA) ventilation because they better isolate the esophagus from the trachea and because the distal lumen permits gastric tube insertion Like the other supraglottic airways, the Combitube and King laryngeal tube are temporary airways that must be removed or replaced by a definitive airway, such as an endotracheal tube or surgical airway (cricothyrotomy or tracheostomy).