Which of the following is considered an airway adjunct?

A nasal airway is indeed considered an airway adjunct because it is a device used to maintain or secure an open airway in a patient. This type of device facilitates the passage of air into and out of the lungs, especially in patients who might be unable to maintain their airway on their own due to sedation, injury, or illness. The nasal airway can be particularly beneficial in cases where the patient's tongue or other anatomical structures could obstruct breathing.

The other options serve different purposes and are not designed to assist directly with airway management. A chest compression device is used for delivering mechanical compressions during cardiopulmonary resuscitation (CPR), a cardiac monitor is intended for tracking heart activity and identifying arrhythmias, while an intravenous catheter is used for administering fluids and medications. None of these options pertain directly to maintaining or securing an airway, which is the primary function of airway adjuncts like the nasal airway.