Question

Pitocin and Magnesium Sulfate Practice QuestionsWith Answers

1. The md orders the pitocin drip to begin at 2 miliunitsof pitocin per minute. The NSS 1000 ml has 10 units of pitocin. What is your iv rate?  (There are 1000 milliunits per 1 unit.)

 

 

 

2.A client is being admitted to L & D for induction of labor using Pitocin. An IV has been started with a #16 gauge catheter. The fluid is LR which is running at 125 hr/hr. Per protocol, 10 units of Pitocin is added to a 500 ml bag of D5LR and piggybacked into the primary IV line, which infuses by gravity. The IV pump for the Pitocin is set at 6 ml/hr. How many milliunits/minute of Pitocin is this patient receiving?

 

 

3. The physician ordered the Pitocin infusion to run at 16mu/min. The   pharmacy sent up 10 units of Pitocin in 500mL of D5LR. You would set your pump at ___________.

 

 

4. Your client is undergoing a labor induction. The infusion has 10 Units of Pitocin in 1000 mL of Normal Saline. She started to receive the medication at 3 mu/min and is ordered to have it titrated 1 mu/min every 20 minutes until the contractions are 2 to 3 minutes apart.

a. What is the concentration factor?

b. What rate will you set the pump for the initial infusion?

c. What will the rate be one hour after starting the infusion?

4.   A patient is admitted for preeclampsia. A Magnesium Sulfate infusion is ordered 30 gm in 1000 mL of D5W. The bolus is 4 gm over 30 minutes followed by a maintenance rate of 0.5 Gm/hour.

b. What is the bolus rate?

c. What is the maintenance rate?

 

 

Answer 1

1) 10 units of pitocin is added in 1000ml of NSS and the order is begin 2mu of pitocin per min.

1000ml/10 units X 1/1000 X 2MU/1 hr

where,

1000ml is the NSS we have

10units of Pitocin

1/1000 is the conversion of pitocin from units to milliunits as the order of the doctor is to start Pitocin in milliunits.

2MU/1hr is theorder in hand to start the infusion.

1000/10 X 1/1000 X 2/1

=2000/10000

=0.2

Now we need to convert into minutes as we have calculated in hour

0.2 X 60 (where 60 is the minutes in 1 hour)

12 ml/hr.

The pitocin IV rate is 12 ml/hr.

2) In this calculation the rate is given as 6ml/hr and 10 units of Pitocin is added in 500 ml of D5LR

500/10 X 1/100 X A = 6

where,

500 ml of D5LR

10 units of pitocin is added,

1/1000 is conversion rate

A is the pitocin in MU/min which is to be calculated

the rate of infusion is 6ml/hr

500/10 X 1/1000 X A =6

500 X A/10,000 = 6

A = 6 X 10,000/500

A = 60,000/500

A= 120 MU/hr

we need to caculate in minutes

A = 120/60

A = 2 MU/min is the rate of pitocin per minute recieved by the patient.

3) THe order is 10 units o Pitocin is added in 500 ml of D5LR, the infusion rate is 16MU/min.

Here we use

500ml/10 units X 1/1000 X 16MU/1 Hr

500 ml of fluid

10 units of pitocin is added,

1/1000 is conversion rate

16mu is the order of the infusion.

500/10X 1/1000X16/1

=8000/10000

=0.8

The infusion is to be converted into minutes as th order of infusion is in minutes.

0.8X60 (where 60 is the minutes)

48ml/hr. is the rate of infuson.

4)  a) The concentration factor is  1mu/min

b) Inital infusion rate

1000/10 X 1/1000 X 3/1

1000ml is the NSS we have

10units of Pitocin

1/1000 is the conversion

3mu is the order of the infusion.

1000/10 X 1/1000 X 3

= 3000/10000

= 0.3

The infusion is to be converted into minutes as th order of infusion is in minutes.

0.3X60 (where 60 is the minutes)

= 18 ml/hr is the initail rate.

c) After 1 hour the rate of infusion is

1000/10 X 1/1000X 1mu/1hr

as per the order 1 mu/min is to be reduced every 20 mins so after 1 hour the rtae of infusion will reduce from 3 mu/min to 1 mu/min

1000/10 X 1/1000 X 1/1

=1000/10000

=0.1

The infusion is to be converted into minutes as th order of infusion is in minutes.

0.1X60 (where 60 is the minutes)

6ml/hr is the rate of infusion.

4) Magnesium sulphate

   a) bolus rate of the infusion given

As per the order 4 gm of bolus to be given in 30 min

The drug is diluted as 30gm in 1000 ml of fluid

Hence the calculation of the bolus rate is

A =1000/30 X 4/ 1 hr

A = 4000/30

A = 133.3 ml/hr which is in 1 hour rate

As we need the bolus to run in 30 min the rate is

133.3 X 2 = 266.6 ml/hr or 267 ml/hr rate of bolus.

b) The maintainence rate of the infusion is

A = 1000/30 X 0.5/1

where 1000 ml is the fluid

30 g is the drug diluted

0.5 g is the rate of the drug ordered

A = 1000 X 0.5/30 X1

A = 500/30

A = 16.6 ml/hr or 17 ml/hr of maintainence rate is to be given.