A client admitted with decompensated heart failure weighing 198\text{ lb} is prescribed a … — NCLEX-RN

A client admitted with decompensated heart failure weighing $198\text{ lb}$ is prescribed a continuous intravenous infusion of milrinone at $0.5\text{ \mu g/kg/min}$ . The pharmacy dispenses a premixed bag containing $20\text{ mg}$ of milrinone in $100\text{ mL}$ of $0.9\%$ sodium chloride. The nurse should set the infusion pump to deliver how many $\text{mL/hr}$ ? (Round the answer to the nearest tenth.)

Cevap: 13.5 mL/hr

Cevap

13.5

To determine the correct infusion rate, a multi-step calculation is required. First, the client's weight is converted to kilograms (

198 \div 2.2 = 90\text{ kg}

). Second, the hourly dose is calculated by multiplying the weight-based dose by the client's weight and then by

60

minutes (

0.5 \times 90 \times 60 = 2,700\text{ \mu g/hr}

). Third, the concentration of the IV bag is converted to matching units (

20\text{ mg} = 20,000\text{ \mu g}

;

20,000 \div 100\text{ mL} = 200\text{ \mu g/mL}

). Finally, the hourly dose is divided by the concentration (

2,700 \div 200

) to yield the correct pump setting of

13.5\text{ mL/hr}

Adım Adım Çözüm

Convert the client's weight from lb to kg.

198\text{ lb} \div 2.2\text{ lb/kg} = 90\text{ kg}

The medication dosage is prescribed based on the client's weight in kilograms.

Calculate the prescribed dose per minute.

0.5\text{ \mu g/kg/min} \times 90\text{ kg} = 45\text{ \mu g/min}

This determines the exact amount of milrinone the client needs every minute.

Convert the dose per minute to the dose per hour.

45\text{ \mu g/min} \times 60\text{ min/hr} = 2,700\text{ \mu g/hr}

Intravenous pumps are typically programmed in milliliters per hour (mL/hr), so the hourly dose is required.

Determine the concentration of the supplied milrinone solution in

\text{\mu g/mL}

20\text{ mg} \times 1,000\text{ \mu g/mg} = 20,000\text{ \mu g}

. Then,

20,000\text{ \mu g} \div 100\text{ mL} = 200\text{ \mu g/mL}

To calculate the volume needed, the medication dose units (micrograms) must match the concentration units.

Calculate the infusion rate in

\text{mL/hr}

2,700\text{ \mu g/hr} \div 200\text{ \mu g/mL} = 13.5\text{ mL/hr}

Dividing the hourly dose by the concentration yields the fluid volume that needs to be delivered per hour.

Anahtar Kavram

Weight-based continuous intravenous infusion rate calculation requiring multiple unit conversions

Tahmini Süre:3m 0s

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