Question

19. Your patient has an order for dobutamine at a rate of 20 mcg/kg/min. Your patient weighs 155 kg. The solution strength is 500 mg dopamine in 250 ml of D5W. How many ml/hr will you infuse this IV? Record your answer using 0 decimal place(s). After receiving report, you walk into your patient's room and see a bag of Levophed 4 mg in 250 ml running through the pump at a rate of 25 ml/hr. Your patient weighs 136.4 lbs. How many mcg/kg/min of Levophed is your patient receiving? Record your answer using 2 decimal place(s). 21. Your patient has an order for dopamine at a rate of 7 mcg/kg/min. Your patient weighs 95.9 kg. The solution strength is 200 mg dopamine in 150 ml of D5W. How many ml/hr will you infuse this IV? Record your answer using 1 decimal place(s). Your patient has an order for esmolol 2.5 grams in 250 ml D5W to infuse at a rate of 6 mcg/kg/min. Your patient weighs 104.6 kg. How many ml/hr will you infuse this IV? Record your answer using 1 decimal place(s). 23. Order: 1000 ml of 0.45% NS with heparin 25,000 units to infuse at 1000 units/hr. How many ml/hr should the patient receiving? Record your answer using 1 decimal place(s). 24. An alcoholic old man who has problems swallowing pills is being discharged from the hospital. The healthcare provider writes a prescription for Lactulose 55 grams a day in three divided doses. How many ml(s)of Lactulose will you administer each dose? See Lactulose label. Record your answer using 1 decimal place(s).

Answer 1

19. Calculation of dobutamine infusion in mL/hr

Step 1:

$\dpi{100} \fn_cm \small Infusion rate =\frac{Desired dose \times weight \times volume \times time}{Available Dose strength mcg/mL }$

Desired dose = 20mcg/kg/min

Patient weighs = 155kg

Volume = 250mL

time min/hr = 60

Available strength of dobutamine = 500mg

To convert into microgram divide by 1000

Available strength of dobutamine = 500000

Step 2:

By substituting the values in the above formula,

$\dpi{100} \fn_cm \small Infusion rate =\frac{20 mcg \times 155 \times 250mL \times 60}{500000 mcg/mL }$

$\dpi{100} \fn_cm \small Infusion rate =\frac{46500000}{500000 }$

Infusion rate = 93mL/hr.

The dobutamine should be infused at a rate of 93mL/hr.

20. Levophed Dose calculation

Step 1:

$\dpi{100} \fn_cm \small Dose = \frac{strength mcg/mL\times ratemL/hr}{weight \times 60}$

Levophed Dose strength = 4mg

To convert microgram, divide by 1000 = 4000mcg

Rate = 25mL/hr

weight = 136.4lbs.

To convert the weight into kg, divide by 2.2

then weight = 136.4/2.2 = 62kg

Time (hr to be converted into min) = 60

Step 2:

By substituting the values, in the above formula

$\dpi{100} \fn_cm \small Dose = \frac{4000 mcg/mL\times 25mL/hr}{62 \times 60}$

$\dpi{100} \fn_cm \small Dose = \frac{100000}{3720}$

Dose = 26.88 mcg/kg/min

The patient is receiving Levphed of 26.88mcg/kg/min.