This study will be performed by asking participants to fill out multiple questionnaires on the symptoms of their cough, and undergo cough testing by inhaling an airway irritant and monitoring the number of coughs after inhalation of the irritant. Subjects would then undergo the treatment and have an injection of either local anesthetic/steroid mixture or a placebo (normal saline) around the nerve that gives feeling to the portion of the voice box responsible for chronic neurogenic cough. After the injection you will be asked to repeat the cough testing and questionnaires 30 minutes, 1 weeks, and at 6 weeks post injection. After the initial six weeks, patients will cross over and repeat the same process with the opposite treatment (either local anesthetic/steroid mixture or placebo) from their previous injection. The total time of participation is about 12 weeks and we hope to recruit 40 subjects.
The purpose of this study is to study the potential benefit of treating chronic neurogenic cough by blocking the nerve responsible for the disease with an injection of local anesthetic/steroid mixture versus a placebo.