In a 60kg female patient, what is the calculated toxic dose of lidocaine (without epinephrine) in mL?

• A. 30mL
• B. 27mL
• C. 24mL
• D. 20mL

Answer: (B)

To determine the calculated toxic dose of lidocaine (without epinephrine) for a 60kg female patient, it is important to understand the maximum allowable dose for lidocaine. Generally, the maximum recommended dose of lidocaine without epinephrine is approximately 5 mg/kg.

For a 60kg patient, the maximum dose can be calculated as follows:

• Maximum dose = 5 mg/kg × 60 kg = 300 mg.

Lidocaine is typically supplied in a concentration that is commonly 1% or 2% solution. A 1% solution contains 10 mg/mL, and a 2% solution contains 20 mg/mL.

Using a 1% lidocaine solution (10 mg/mL), the volume that corresponds to the maximum dose of 300 mg can be calculated:

• Volume = Total dose / Concentration

• Volume = 300 mg / (10 mg/mL) = 30 mL.

Similarly, if using a 2% solution, the calculation would be:

• Volume = 300 mg / (20 mg/mL) = 15 mL.

Referring back to the choices provided, the best option that represents a commonly accepted toxic dose without exceeding safety