What does stimulus delivery in the CRT typically involve?

In the context of the Cough Reflex Test (CRT), stimulus delivery typically involves using nebulization to deliver irritants. This method is commonly utilized because it allows for direct inhalation of aerosolized substances that can effectively stimulate the cough reflex. Various irritants, such as capsaicin or citric acid, are administered in this manner to provoke a cough response, which is a critical aspect of assessing the function of the cough reflex.

Nebulization is particularly advantageous as it delivers the irritant directly to the respiratory tract, ensuring that the stimulus is applied where it can evoke a physiological response. This method provides controlled and reproducible exposure to the irritants, making it easier to evaluate the threshold and efficacy of the cough reflex in a standardized manner.

In contrast, the other options do not serve the intended purpose of stimulating the cough reflex directly in a manner conducive to the CRT. Administering oral medications, performing physical therapy exercises, and administering intravenous fluids do not provide the necessary irritant or direct stimulation to the respiratory system that is crucial for assessing cough reflex sensitivity.