1. Medication order: Loading dose, mix magnesium sulfate 30 g in 1000 mL D5W. In
ID: 245844 • Letter: 1
Question
1. Medication order: Loading dose, mix magnesium sulfate 30 g in 1000 mL D5W. Infuse 6 g over 20 minutes, then maintain 1 g/hr. Maintain primary IV 1000 mL D5W at 60 mL/hr after magnesium sulfate loading dose. Available: Magnesium sulfate 50% in 10 mL vials Calculate the secondary rate for the loading dose.
2. Mix 12 units of oxytocin in 500 mL NS.
Start infusion at 18 mL/hr.
Increase by 5 mL/hr every 10 minutes until uterine contractions are 2 to 3 minutes apart.
Do not exceed 32 milliunits/min.
Maintain total IV fluid volume at 100 mL/hr.
How many milliunits per minute will be delivered when you start this infusion?(round to the nearest tenth)
3. Mix 18 units of oxytocin in 750 mL NS.
Start infusion at 20 mL/hr.
Increase by 5 mL/hr every 10 minutes until uterine contractions are 2 to 3 minutes apart.
Do not exceed 40 milliunits/min.
Maintain total IV fluid volume at 100 mL/hr.
How many milliunits per hour will be delivered?
4. Mix 10 units of oxytocin in 1000 mL NS.
Start infusion at 25 mL/hr.
Increase by 5 mL/hr every 10 minutes until uterine contractions are 2 to 3 minutes apart.
Do not exceed 44 milliunits/min.
Maintain total IV fluid volume at 100 mL/hr.
You have calculated that 250 milliunits/hr will be delivered.
How many milliunits per minute will be delivered? (round to the nearest tenth)
5. Mix 10 units of oxytocin in 1000 mL NS.
Start infusion at 25 mL/hr.
Increase by 5 mL/hr every 10 minutes until uterine contractions are 2 to 3 minutes apart.
Do not exceed 44 milliunits/min.
Maintain total IV fluid volume at 100 mL/hr.
How many milliunits per hour will be delivered?
Explanation / Answer
ANSWER 1: 50% of magnesium sulphate = 5gm/ 10ml.
If 6gms of magnesium sulphate has to be given in 20 minutes the patient should receive = 6/20= 0.3gms/minute
Total drip concentration = 30/1000 = 0.03gm
Infusion rate for loading dose = Total drug to be given per minute/ drip concentration
= 0.3/0.03= 10ml/minute
If 1 gm of magnesium sulphate has to be given in one hour then the infusion rate should be = 6.6ml/hr
Answer 2:
In order to convert the unit into milliunit, the unit value is multiplied by 1000 = 12 unit*1000= 12000 milliunits
12000 milliunits of Oxytocin is added in 500 ml of NS.
Drip concentration = 12000/500 = 24 milliunits/ml
Initial infusion rate is 18ml/hr, so the total milliunits per hour is 24 * 18= 432 milliunits
total milliunits per minute = 432/60 = 7.2 milliunit
Answer 3:
Total drug = 18 units = 18000 milliunits of oxytocin
volume to be infusion = 750ml
Drpi concentration = 18000/750 = 24 mliliunits/ml
If the IV fluid rate is 100ml/hr then total milliunits per hour = 24 * 100 = 2400 milliunits
Answer 4:
Total milliunits per hour delivered = 250 milliunits / hr
Total milliunits per minute = 250 / 60 = 4.17 milliunits
Answer 5:
Total drug = 10 units = 10000 milliunits of oxytocin
volume to be infusion = 1000ml
Drpi concentration = 10000/1000 = 10 mliliunits/ml
If the IV fluid rate is 100ml/hr then total milliunits per hour = 10 * 100 = 1000 milliunits
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