A healthy 160-pound patient has received three cartridges of 2% lidocaine, 1:50,000 epinephrine during an oral surgical procedure. How many more cartridges with the same drug could this patient receive before reaching the MRD?

Question

Quizplus · Accepted Answer

The MRD for lidocaine with 1:50,000 epinephrine is 500 mg. Each cartridge contains 20 mg of lidocaine. The patient has already received 60 mg (3 cartridges x 20 mg/cartridge). Therefore, the patient can receive 440 mg more (500 mg - 60 mg) before reaching the MRD. This is equivalent to 22 cartridges (440 mg / 20 mg/cartridge).

A Healthy 160-Pound Patient Has Received Three Cartridges of 2