Cough Reflex Test (CRT) Practice Exam 2026 - Free CRT Practice Questions and Study Guide

When administering 80%/20% heliox to a patient with airway obstruction, a nonrebreathing mask is the most appropriate choice because it provides a high concentration of heliox delivery while minimizing the dilution of the gas mixture. The nonrebreathing mask is designed to ensure that the patient receives a continuous flow of the therapeutic gas, and it has one-way valves that prevent the inhalation of room air, thereby maximizing the concentration of heliox being breathed in.

In situations involving airway obstructions, it's crucial to maintain a high concentration of the delivered gas to help reduce airway resistance and improve ventilation. The nonrebreathing mask allows for a higher flow rate of gas to be delivered directly to the patient, supporting their breathing needs effectively.

Other options like the Venturi mask and simple mask do not provide the same level of controlled gas delivery or high concentration that is required in this scenario. Nasal cannulas, while useful for lower concentrations of oxygen, are less effective for delivering heliox in significant volumes, especially in the context of managing airway obstruction.