Intratracheal doses for ALS are usually how many times the IV dose?

Intratracheal doses for ALS are usually how many times the IV dose?

• A. 1x
• B. 2x
• C. 0.5x
• D. 3x

Answer: (B)

The main idea is that delivering local anesthetic as an aerosol to the airway requires a larger total amount than giving it IV to achieve the same mucosal anesthesia. When you spray the airway, a lot of the drug is lost to the lumen or only poorly reaches the nerve endings in the mucosa, so you compensate by using about twice the IV dose to get effective topical anesthesia without pushing systemic levels too high. This balance helps suppress airway reflexes during procedures like intubation while keeping the risk of systemic toxicity in check. If you underdose, the airway may remain reactive; if you overdose, you risk toxicity from the same drug absorbed systemically.

The main idea is that delivering local anesthetic as an aerosol to the airway requires a larger total amount than giving it IV to achieve the same mucosal anesthesia. When you spray the airway, a lot of the drug is lost to the lumen or only poorly reaches the nerve endings in the mucosa, so you compensate by using about twice the IV dose to get effective topical anesthesia without pushing systemic levels too high. This balance helps suppress airway reflexes during procedures like intubation while keeping the risk of systemic toxicity in check. If you underdose, the airway may remain reactive; if you overdose, you risk toxicity from the same drug absorbed systemically.