Question

Magnesium sulfate 30 grams is mixed in 500 ml Lactated Ringers. The client is at 32 weeks gestation and is contracting every 2 to 3 minutes. The cervical dilatation is 2 cms. Physician order: administer a 4 gram bolus dose to infuse over thirty (30) minutes. How many ml / hour will you set the IV pump? WHAT VOLUME WOULD YOU SET THE PUMP TO GIVE?

Answer 1

Ans

30 gram is infused in 500 ml

1 gram is infused in 500/30 ml

4 gm is infused in 500/30×4 ml = 66.66 ml

4 gram bolus is to infuse over 30 minutes or 0.5 hour

Rate of infusion = 66.66 ml / 0.5 hr = 133.32 ml/hr

Volume to be set on the pump is 66.66 ml