Doctor’s Order: ¾ L of D5W to infuse over 5 hr 45 min; Drop factor: 60 gtt/mL. How many gtt/min will you regulate the IV?
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Solution
5 hrs x 60 = 300 mins + 45 mins = 345 mins
\frac{750\, ml}{345\, mins}\times 60\, gtt/ml= 130\, gtt/min
Doctor’s Order: Cefoxin 0.5 Gm in 275 mL of D5W to infuse IVPB over 2 hours; Drop Factor: 60 gtt/mL. How many gtt/min will you regulate the IV?
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Solution
2 hrs x 60 mins = 120 mins
\frac{275\, ml}{120\, mins}\times 60\, gtt/ml= 138\, gtt/min
Doctor’s Order: Infuse 2750 mL of 0.45% Normal Saline at 150 mL/hr; Drop Factor: 15 gtt/mL. How many gt/mL will you regulate the IV?
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Solution
\frac{150\, ml}{60\, mins}\times 15\, gtt/ml= 38\, gtt/min
Doctor’s Order: Zantac 150 mg in 175 mL of D5W to infuse IVPB over 45 minutes; Drop factor: 12 gtt/mL. How many mL/hr will you set on the IV infusion pump?
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Solution
\frac{175\, ml}{0.75\, hr}= 233.3\, ml/hr
Doctor’s Order: 1 ¼ L of D5 with Ringer’s lactate to be infused over 18 hours; Drop factor: 20 gtt/mL. What flow rate (mL/hr) will you set on the IV infusion pump?
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Solution
\frac{1,250\, ml}{18\, hrs}= 69.4\, ml/hr
Doctor’s Order: Infuse 250 mL of platelets IV over 2 hr 30 min; Drop factor: 10 gtt/mL. What flow rate (mL/hr) will you set on the IV infusion pump?
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Solution
\frac{250\, ml}{2.5\, hrs}= 100\, ml/hr
Doctor’s Order: Ancef 0.4253 Gm IM bid; Reconstitution instructions: For IM solution add 1.25 mL of diluent. Shake to dissolve. Provides an approximate volume of 1.6 mL (240 mg/mL). How many mL will you give?
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Solution
\frac{0.4253\, g}{240\, mg}\times \frac{1,000\, mg}{1\, g}\times 1\, ml= 1.8\, ml
Doctor’s Order: Fentanyl 0.05 mg IV bolus; Reconstitution instructions: Constitute to Fentanyl 100 micrograms/2.3 mL with 2.4 mL of 5% Dextrose Water for Injection. How many mL will you administer?
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Solution
\frac{0.05\, mg}{100\, mcg}\times \frac{1,000\, mcg}{1\, mg}\times 2.3\, ml= 1.2\, ml
Doctor’s Order: Amikacin 5 mg/ lb IM q 12 hr; Available: Amikacin 0.9 gm/ 2 mL. How many mL will you administer to a 72.7 Kg patient?
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Solution
72.7 x 2.2 = 160 lb
5 mg/lb x 160 lb = 800 mg (per dose)\frac{800\, mg}{0.9\, g}\times \frac{1\, g}{1,000\, mg}\times 2\, ml= 1.8\, ml
Doctor’s Order: Penicillin G 223,500 units IM q 4 hr; Available: Penicillin G 500,000 units /2.5 mL. How many mL will you administer?
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Solution
\frac{223,500\, units}{500,000\, USP \, units}\times 2.5\, ml= 1.1\, ml