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.
___________
Step 1:
Order: Mix magnesium sulfate 30g in 1000 mL.
1000 mL = 30 g
Infusion order = 6 g over 20 minutes.
Therefore,
Amount = Ordered dose / Dose on hand X volume
= 6 / 30 X 1000
Amount = 200 mL
Hence 200 mL contains 6 g of magnesium sulfate to be infused over 20 minutes.
Step 2:
1 hour = 60 minutes.
Ordered time = 20 minutes
mL/hr = 60 / 20 X 200
mL/hr = 600
The infusion pump to be set 600 mL/hr to infuse 6 g of magnesium sulfate for over 20 minutes.
Step 3:
Ordered secondary loading dose = 1g/hr.
200 mL contains 6g
Therefore 1g = 200 / 6
1g = 33.3 mL/hr
or
Ordered dose = 1g
Available dose = 30g
Volume = 1000 mL
Amount = Ordered dose / Dose on hand X Volume
Amount = 1 / 30 X 1000
Amount = 33.3 mL /hr
The infusion should be set as 33.3 mL/hr for secondary loading Dose.
Medication order: Loading dose, mix magnesium sulfate 30 g in 1000 mL D5W. Infuse 6 g...
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