For children, heparin sodium is administered by intermittent...

For children, heparin sodium is administered by intermittent IV infusion in a range of 70 to 90 units $/ \mathrm{kg}$ of body weight every $4 \mathrm{hrs}$. For a $50-\mathrm{lb}$ child, calculate the range, in $\mathrm{mL}$, of a heparin sodium injection containing 5000 units/ $\mathrm{mL}$ to be administered daily.

Key Concepts

Weight Conversion

This concept involves converting body weight from one unit to another, such as from pounds to kilograms. In medical dosing, especially for children, weight is often required in kilograms when the dosage is prescribed per kilogram of body weight. Understanding unit conversion ensures that the correct drug dose is administered based on the patient’s actual body weight.

Dosage Calculation Based on Body Weight

This concept refers to determining the total dose of a medication based on the patient’s weight and the prescribed units per kilogram. It involves multiplying the patient’s weight in kilograms by the dosage rate to obtain the total number of units of the medication needed. This calculation is essential in pediatric dosing to ensure accuracy and safety.

Medication Concentration and Volume Calculation

This concept involves using the known concentration of a medication solution (units per mL) to convert a required drug dose from units to an appropriate volume for administration. The process includes dividing the total required units by the concentration to obtain the corresponding volume in mL, ensuring that the patient receives the correct dose in a measurable form.

Dosing Frequency and Interval Dosing

This key concept pertains to how often the medication is administered, which impacts the total daily dosage calculation. In intermittent dosing schedules, such as one dose every 4 hours, the total number of doses per day must be considered when planning treatment. This ensures that the overall daily dosage matches the therapeutic requirements without overdosing or underdosing the patient.

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