A 140-pound patient received 144 mg of 2% lidocaine plain. How many more milligrams of the same drug can the patient receive without exceeding the MRD? Provide mathematical formulas required to calculate the correct answer
What will be an ideal response?
The MRD for 2% lidocaine plain is 3.2 mg/lb with a maximum of 500 mg per appointment. This patient can receive a total of 3.2 mg/lb which equals 448 mg maximum per appointment. (3.2 x 140 = 448). Next, subtract mg of drug received from MRD (448 - 144 = 334 mg). The patient can receive an additional 334 mg of 2% lidocaine plain.
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