At the change of shift you notice 200 ml left to count in the I.V. bag. The I.V. is infusing at 80 ml/hr. How much longer will the I.V. run?
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Solution
Solution: 200 ÷ 80 = 2.5 = 2 hrs and 30 mins
One liter NS to infuse over 24 hours using a micro drip (gravity flow). Calculate the flow rate.
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Solution
IV Flow Formula:
\( \frac{volume\, to\, be\, infused\, (ml)}{time\, (minutes)}\times calibration\, (gtt/ml)= flow rate\, (gtt/min)\)Solution:
\(\frac{1,000\, ml}{1,440\, mins}\times 60\, gtt/ml= 41.67\Rightarrow 42\, gtt/min\)
LR 125 ml/hr via gravity flow using tubing calibrated at 15 gtt/ml. Calculate the flow rate.
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Solution
IV Flow Formula:
\( \frac{volume\, to\, be\, infused\, (ml)}{time\, (minutes)}\times calibration\, (gtt/ml)= flow rate\, (gtt/min)\)
Solution:
\( \frac{125\, ml}{60\, mins}\times 15\, gtt/ml= 31.25\Rightarrow 31\, gtt/min\)
Give Phenergan for a child whose BSA is 1.2 m2. The usual adult dose is 25 mg. How many milligrams would the nurse administer for the dose?
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Solution
BSA Formula:
\( \frac{child's\, BSA\, [m^{2}]\times usual\, adult dose}{1.7\, m^{2}}= child's\, dose\)Solution:
\( \frac{1.2\, m^{2}\times 25\, mg}{1.7\, m^{2}}= 17.6\, mg\)
Give Biaxin for a child whose BSA is 0.55 m2. The usual adult dose is 500 mg. Biaxin is available in an oral suspension. The 100ml bottle is labeled 50 mg/ml. How many ml would the nurse give per dose?
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Solution
Formula:
\( \frac{desired\, amount}{have\, on\, hand}\times quantity= x\)BSA Formula:
\( \frac{child's\, BSA\, [m^{2}]\times usual\, adult dose}{1.7\, m^{2}}= child's\, dose\)Solution:
\( \frac{0.55\, m^{2}\times 500\, mg}{1.7\, m^{2}}= 161.76\Rightarrow \frac{161.76\, mg}{50\, mg}\times 1\, ml= 3.2\, ml\)
Give Ceclor 45 mg/kg/day p.o. in 3 divided doses for a patient who weighs 66 pounds. A 75 ml stock medication is labeled Ceclor 125 mg/ml. How many ml would the nurse administer per dose?
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Solution
Formula:
\( \frac{desired\, amount}{have\, on\, hand}\times quantity= x\)
Solution: 45 mg/kg/day x 30 kg = 1.350 mg/day ÷ 3 doses = 450 mg per dose
\(\frac{450\, mg}{125\, mg}\times 1\, ml\, \div 3\, doses= 3.6\, ml\)
Give Fortaz mg/kg/day p.o. 50 mg/kg p.o. t.i.d. to a child who weighs 25.5 kg. Fortaz is available in an oral suspension labeled 100 mg/ml. How many ml would the nurse administer per dose?
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Solution
Formula:
\( \frac{desired\, amount}{have\, on\, hand}\times quantity= x\)Solution:
\( 50\, mg/kg\times 25.5\, kg= 1,275\, mg\)\(\frac{1,275\, mg}{100\, mg}\times 1\, ml= 12.75\, ml\, or\, 12.8\, ml\)
Doctor’s order: Morphine gr 1/10; Available: Morphine 10 mg/ml. How many ml will the nurse give?
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Solution
Formula:
\(\frac{desired\, amount}{have\, on\, hand}\times quantity= x\)\(Solution: gr\, 1/10= 6\, mg\Rightarrow \frac{6\, mg}{10\, mg}\times 1\, ml= 0.6\, ml\)
Doctor’s order: Zofran 8 mg p.o. t.i.d.; Available: Zofran in a 100 ml bottle labeled 4 mg/tsp.; How many ml will the nurse administer for each dose?
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Solution
Formula:
\( \frac{desired\, amount}{have\, on\, hand}\times quantity= x\)\(Solution: 1\, tsp= 5\, ml\Rightarrow \frac{8\, mg}{4\, mg}\times 5\, ml= 10\, ml\)
Doctor’s order: Amoxicillin 0.25 g p.o. every 8 hours; Available: Amoxicillin 125 mg tablets. How many tablets will the nurse give per dose?
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Solution
Formula:
\( \frac{desired\, amount}{have\, on\, hand}\times quantity= x\)Solution:
\( 0.25\, g= 250\, mg\Rightarrow \frac{250\, mg}{125\, mg}\times 1\, tab= 2\, tabs\)