Serum lidocaine levels following administration of topical lidocaine during in office laryngopharyngeal procedures

This study measures the amount of lidocaine (a numbing medicine) that gets into the bloodstream when it is sprayed into the throat and voice box area during in-office procedures. Lidocaine is commonly used to keep patients comfortable during these procedures, but too much in the blood can be dangerous. The study will measure blood levels in 50 patients to confirm the drug is being used safely. You may be eligible if: - You are 18 years of age or older - You are having an awake procedure on your throat or voice box in the clinic - You are able to give informed consent You may NOT be eligible if: - You are under 18 years old - You have a bleeding or clotting disorder - You have kidney or liver disease - You have a heart rhythm problem - You are allergic to lidocaine - You are unable to give consent Talk to your doctor about whether this trial might be right for you.