Final answer:
The recommended antineoplastic medication dose for a child with a BSA of 0.43 m², when calculated from the usual adult dose of 40 mg for a BSA of 1.7 m², is 10 mg.
Step-by-step explanation:
To calculate the recommended child's dose of an antineoplastic medication based on the child's body surface area (BSA), we can use a proportion since dosages are often tailored to BSA. Given that the child's BSA is 0.43 m² and the average adult BSA is 1.7 m², with the usual adult dose being 40 mg, we can set up the following equation:
Child's Dose / Child's BSA = Adult Dose / Adult BSA
Child's Dose / 0.43 m² = 40 mg / 1.7 m²
Now, we cross-multiply and solve for Child's Dose:
Child's Dose = (40 mg * 0.43 m²) / 1.7 m²
Child's Dose = 10.12 mg
When rounded to the nearest whole number, the recommended dose for the child is 10 mg.