A nurse is preparing to administer a continuous intravenous infusion of dobutamine to a cl… — NCLEX-RN

A nurse is preparing to administer a continuous intravenous infusion of dobutamine to a client with severe heart failure. The healthcare provider prescribes dobutamine at $5\text{ mcg/kg/min}$ . The client weighs $176\text{ lbs}$ . The pharmacy supplies a premixed intravenous bag containing $500\text{ mg}$ of dobutamine in $250\text{ mL}$ of $5\%\text{ dextrose in water}$ ( $D_5W$ ). What rate, in $\text{mL/hr}$ , should the nurse program into the infusion pump to deliver the prescribed dose?

$12\text{ mL/hr}$ Cevap
B
$24\text{ mL/hr}$
C
$26.4\text{ mL/hr}$
D
$48\text{ mL/hr}$

Cevap

The correct infusion rate is 12 mL/hr.

To calculate the correct infusion rate, the nurse must first convert the client's weight to kilograms (

176 \div 2.2 = 80\text{ kg}

). Next, the per-minute dose is calculated (

80\text{ kg} \times 5\text{ mcg/kg/min} = 400\text{ mcg/min}

) and converted to an hourly rate (

400 \times 60 = 24,000\text{ mcg/hr}

). Since the bag is labeled in milligrams, micrograms must be converted to milligrams (

24,000 \div 1,000 = 24\text{ mg/hr}

). The concentration of the intravenous bag is

2\text{ mg/mL}

(

500\text{ mg} \div 250\text{ mL}

). Dividing the hourly dose by the concentration yields the final pump rate (

24\text{ mg/hr} \div 2\text{ mg/mL} = 12\text{ mL/hr}

Adım Adım Çözüm

Convert the client's weight from pounds to kilograms.

176\text{ lbs} \div 2.2\text{ lbs/kg} = 80\text{ kg}

The medication is prescribed based on kilograms of body weight.

Calculate the total prescribed dose per minute.

80\text{ kg} \times 5\text{ mcg/kg/min} = 400\text{ mcg/min}

To determine the exact amount of medication the client requires each minute.

Convert the per-minute dose to an hourly dose.

400\text{ mcg/min} \times 60\text{ min/hr} = 24,000\text{ mcg/hr}

Infusion pumps are programmed in mL per hour, requiring the dose to be on an hourly basis.

Convert micrograms (mcg) to milligrams (mg).

24,000\text{ mcg/hr} \div 1,000\text{ mcg/mg} = 24\text{ mg/hr}

The supplied medication is measured in milligrams, so the units must match before calculating volume.

Determine the medication concentration.

500\text{ mg} \div 250\text{ mL} = 2\text{ mg/mL}

To find out how many milligrams are in each milliliter of the intravenous fluid.

Calculate the final infusion rate in mL/hr.

24\text{ mg/hr} \div 2\text{ mg/mL} = 12\text{ mL/hr}

Dividing the required hourly dose by the concentration provides the volume to be infused per hour.

Anahtar Kavram

Weight-based intravenous medication dosage calculation

Tahmini Süre:2m 0s

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