# Celling units that appear in both the numerator and

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celling units that appear in both the numerator and denominator:XXXX×=×=×==4 g4 g25mL2 g4 g25mL245mL412uni00A0uni00A0uni00A0uni00A0uni00A0uni00A0uni00A000005 mLuni00A0The magnesium sulfate solution should be infused at125 mL/hour.EBSCOhost - printed on 3/24/2020 6:42 PM via JERSEY COLLEGE. All use subject to
322Calculating obstetric drug dosagesLet’s seize that problem againHere’s another approach to solving the same problem.First, calculate the strength of the solution by setting up a propor-tion with the known strength in one fraction and the unknownstrength in the other fraction:4 g250 mLmLuni00A0uni00A0=X1Cross-multiply the fractions:X×250 mL=4 g×1 mLSolve forXby dividing each side of the equation by 250 mLand cancelling units that appear in both the numerator anddenominator:XXX×=×==25mL25mL4 g1 mL25mL4 g2516 g00000 0uni00A0uni00A0uni00A0uni00A0uni00A0uni00A0uni00A0.The solution’s strength is 0.016 g/mL. Next, calculate the flow rateby setting up another proportion with the solution concentrationin one fraction and the unknown flow rate in the other fraction:1 mL16 g2 guni00A0uni00A0uni00A0.0 0=XCross-multiply the fractions:X×0.016 g=1 mL×2 gSolve forXby dividing each side of the equation by 0.016 g and can-celling units that appear in both the numerator and denominator:XXX×=×==0 00 00 00 0....uni00A0uni00A0uni00A0uni00A0uni00A0uni00A016 g16 g1 mL2 g16 g2 mL16125 mLuni00A0The same flow rate of 125 mL per hour is obtained using thismethod.Let’s try to solvethe same problemusing anothermethod.EBSCOhost - printed on 3/24/2020 6:42 PM via JERSEY COLLEGE. All use subject to
323Dosage calculationsDosage drillTest your math skills with this drillTo find the answer, set up ratios and a proportion and solve forX. Remember that 1 L=1,000 mL.1,000 mL:8 g::125 mL:XgThe patient is receiving 1 g of magnesium sulfate per hour.A patient with gestational hypertension is receiving 8 g ofmagnesium sulfate in 1 L of dextrose 5% in water at 125 mL/hour.How many grams per hour is the patient receiving?Be sure to showhow you arrive atyour answer.Your answer:______________________EBSCOhost - printed on 3/24/2020 6:42 PM via JERSEY COLLEGE. All use subject to
324Calculating obstetric drug dosagesPreterm labor? Try terbutalineYour patient is in preterm labor. The doctor prescribes10 mg terbuta-line sulfate in 250 mL D5W to infuse at 5 mcg/minute.What’s the flowrate for this solution?

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Term
Fall
Professor
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Tags
Mass, Kilogram, Jersey College