Question

The maximum recommended number of 1.8ml

cartridges of 2% lidocaine with
epinephrine 1:100,000 that may be safely
administered to a 17kg child is approximately
A. 0.5.
B. 1.
C. 1.5.
D. 2.
E. 2.5.

Answer 1

The maximum recommended number of 1.8ml cartridges of 2% lidocaine with epinephrine 1:100,000 that may be safely administered to a 17kg child is approximately 1.5 cartridges.

Step-by-step explanation:

The maximum recommended number of 1.8ml cartridges of 2% lidocaine with epinephrine 1:100,000 that may be safely administered to a 17kg child is approximately 1.5 cartridges.

To calculate this, we need to consider the safe dosage of lidocaine with epinephrine based on the child's weight. The usual dosage is 4.4 mg per kg of body weight. For a 17kg child, this would amount to 74.8 mg.

Each 1.8ml cartridge of 2% lidocaine with epinephrine contains 36 mg of lidocaine and 18 mcg (micrograms) of epinephrine. Therefore, the maximum recommended number of cartridges that can be safely administered to the child is approximately 74.8 mg / 36 mg = 2.077... rounded down to 2 cartridges.

However, it's important to note that this calculation does not take into account individual medical conditions or specific instructions from a healthcare professional. Always consult a qualified healthcare provider for accurate and personalized medical advice.

Answer 2

Step-by-step explanation:

The maximum recommended dose of lidocaine is often calculated based on the child's weight. The typical guideline is around 4.4 mg/kg.

For a 17 kg child:

\[ \text{Maximum Dose} = 4.4 \, \text{mg/kg} \times 17 \, \text{kg} \]

\[ \text{Maximum Dose} \approx 74.8 \, \text{mg} \]

Now, since you have a 2% lidocaine solution, which means 20 mg/ml (2% of 1000 mg), you can find the maximum volume by dividing the maximum dose by the concentration:

\[ \text{Maximum Volume} = \frac{74.8 \, \text{mg}}{20 \, \text{mg/ml}} \]

\[ \text{Maximum Volume} \approx 3.74 \, \text{ml} \]

So, the closest option is:

**C. 1.5** (as it is less than the calculated maximum volume).