Question

16. The doctor orders a Dobutamine infusion to be started at 10 mcg/kg/min. The patient weighs 180 lbs. You're supplied with a 250 mL bag of Dobutamine that reads 2 mg/mL. whatis the IV pump rate? 17. How long will it take for the Dobutamine infusion to complete (have to change the bag)? 18. The order is to Infuse 1500 mL of Lactated Ringer's over 12 hours. You have tubing with Drip factor of 15 gtt/mL. 19. Order: 2L of D5 1/2 Normal Saline with 50 meq Potassium Chloride over 48 hours. Drip factor: 15 gtt/mL. 20. Order 1 L of D5 to infuse over 5 hours. What is the IV pump rate?

Answer 1

16. Order Dose - Dobutamine 10 mcg/kg/min

Patients weigh 180lbs(81.8 kg).

Available quantity 2mg/ml

Desire dose is

10mcg/kg x 81kg = 810mcg/min

Desire dose per hour is 48,600 mcg

$810mcg/min\times 60 min=48,600 mcg$

48,600 mcg = 48.6mg

You supplied 250 ml of the bag that contains dobutamine 2mg/ml

$48.6mg\div 2mg/ml = 24.3ml$

Answer - The pump rate will be 24.3 ml per hour.

17.

The total bag of dobutamine contains 250 ml.

We will infuse it 24.3 ml per hour.

So,

250ml = 24.3ml/hr x 60min = 617min

617 minutes = 10 hour 17 min

Answer - The total infusion will be completed in 10 hours and 17 minutes.

18.

Order dose 1500 ml in 12 hours

$1500ml\div 12 h = 125ml/h$

Drop factor - 15gtt/ml

Drop calculation formula

Volume in ML $\div$ Time in Minutes $\times$ Drop factor

$125 ml \div 60 min \times 15gtt/ml = 31.25 drops/min$

Answer - You will start drip set at 31 drops per minute.

19.

Order dose 2 litter of D5 1/2 NS with 50 meq potassium chloride over 48 hours

Per hour you have to infuse 41.6ml

$2000 ml \div 48 h = 41.6 ml/h$

Drop factor 15 gtt/ml

Drop calculation formula

Volume in ML $\div$ Time in Minutes $\times$ Drop factor

$41.6 ml\div 60 min\times 15 gtt/ml=10.4 drops/min$

Answer - The nurse will start at 10 drops per minute.

20.

Order dose 1 litter of D5 to infuse over 5 hours.

$1000ml \div 5 hours = 200 ml/h$

Answer - The pump rate is 200 ml per hour.