A practical nurse (PN) is preparing to administer a scheduled dose of ampicillin intramusc… — NCLEX-PN

A practical nurse (PN) is preparing to administer a scheduled dose of ampicillin intramuscularly (IM) to a pediatric client who weighs $52.8\text{ lb}$ . The healthcare provider's prescription reads: ampicillin $100\text{ mg/kg/day}$ IM divided in equal doses every 6 hours. The pharmacy dispenses a $1\text{ g}$ vial of ampicillin powder. The reconstitution instructions on the vial state: "Add $3.5\text{ mL}$ of sterile water for injection to yield a final volume of $4\text{ mL}$ with a concentration of $250\text{ mg/mL}$ ."

How many milliliters (mL) should the PN administer per dose?

Record your answer using one decimal place. Do not include units in your answer.

Cevap: 2.4 mL

Cevap

2.4

To solve this problem, first convert pounds to kilograms (

52.8\text{ lb} \div 2.2 = 24\text{ kg}

). Next, determine the total daily dose (

24\text{ kg} \times 100\text{ mg/kg} = 2400\text{ mg/day}

). Since the medication is given every 6 hours (4 times a day), divide the daily dose by 4 to find the single dose (

2400\text{ mg} \div 4 = 600\text{ mg/dose}

). Finally, use the final yield concentration (

250\text{ mg/mL}

) to find the volume:

600\text{ mg} \div 250\text{ mg/mL} = 2.4\text{ mL}

. The values of

1\text{ g}

3.5\text{ mL}

of sterile water, and

4\text{ mL}

total volume are extraneous information not used in the final equation.

Adım Adım Çözüm

Convert the client's weight from pounds (lb) to kilograms (kg).

24\text{ kg}

The medication is prescribed based on milligrams per kilogram (

mg/kg

), so the weight must be in standard metric units (

52.8\text{ lb} \div 2.2\text{ lb/kg} = 24\text{ kg}

Calculate the total daily dose of the medication.

2400\text{ mg/day}

Multiply the client's weight in kg by the prescribed daily dosage parameter (

24\text{ kg} \times 100\text{ mg/kg/day} = 2400\text{ mg/day}

Determine the amount of medication required for a single dose.

600\text{ mg/dose}

The medication is ordered every 6 hours, which equals 4 doses in a 24-hour period. Divide the total daily dose by 4 (

2400\text{ mg} \div 4 = 600\text{ mg/dose}

Calculate the required volume to administer using the final reconstituted concentration.

2.4\text{ mL}

Divide the desired dose (

600\text{ mg}

) by the concentration on hand (

250\text{ mg/mL}

). The diluent amount (

3.5\text{ mL}

) and total vial volume (

4\text{ mL}

) are extraneous distractors (

600\text{ mg} \div 250\text{ mg/mL} = 2.4\text{ mL}

Anahtar Kavram

Advanced dosage calculation requiring weight conversion, daily-to-single dose division, and identification of correct reconstitution concentration while filtering extraneous data.

Tahmini Süre:3m 0s

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Cevap

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