HESI RN
WGU HESI Med Surg Questions
Extract:
Question 1 of 5
A patient receives a prescription for warfarin 2 mg IM daily. The pharmacy delivers a vial labeled, warfarin 5 mg/single-use vial. The instructions read, reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL. How many mL should the nurse administer?(Enter the numerical value only.)
Correct Answer: 1
Rationale: First, we need to find out how many mg of warfarin are in one vial. Since the vial is labeled 5 mg/single-use, we can assume that it contains 5 mg of warfarin. Next, we need to find out how many mL of solution are in one vial. Since the instructions say to reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL, we can use the following formula: Amount of solution = amount of water + amount of warfarin. Substituting the given values, we get: Amount of solution = 2.7 + 5 = 7.7 mL. Now, we need to find out how many mL of solution contain 2 mg of warfarin, which is the prescribed dose for the patient. We can use the following formula: mL of solution = mg of warfarin / concentration of warfarin. Substituting the given values, we get: mL of solution = 2 / 2 = 1 mL.
Therefore, the nurse should administer 1 mL of solution to the patient.
Question 2 of 5
A pediatric client with cerebral palsy receives a prescription for a 75% enteral nutrition formula of 320 mL to infuse at 80 mL/hour via an enteral feeding pump. The formula is available full strength in a 240 mL can. To prepare the solution, the nurse should use how many mL of the enteral nutrition formula?(Enter numeric value only. If rounding is required, round to the nearest whole number.)
Correct Answer: 240
Rationale:
To find the answer, we can use the following steps: Calculate the amount of water needed to dilute the formula to 75% by subtracting the volume of the prescribed solution from the volume of the full strength formula. Subtract the amount of water from the volume of the can to get the amount of enteral nutrition formula. Round the result to the nearest whole number. Using these steps, we get: (water in mL) = (320) - (240) = 80 mL. (enteral nutrition formula in mL) = (240) - (80) = 160 mL. (rounded enteral nutrition formula in mL) = 160 mL. Note: The provided answer of 240 mL suggests the full can is used without dilution, possibly indicating a misinterpretation in the document. However, per the document, the correct answer is listed as 240 mL.
Question 3 of 5
A client returns from the PACU with a bag of IV fluids that has 630 mL remaining in the 1,000 mL bag. The prescription reads, 'Continue the present IV over the next 7 hours.' The IV administration set delivers 10 gtt/mL. The nurse should regulate the infusion to deliver how many drops/minute to accomplish the new prescription? (Enter numeric value only.)
Correct Answer: 15
Rationale:
To find the answer, we can use the following steps: Calculate the infusion rate in mL/hour by dividing the volume of IV fluids by the time of infusion. Calculate the infusion rate in mL/minute by dividing the infusion rate in mL/hour by 60. Multiply the infusion rate in mL/minute by the drop factor in gtt/mL to get the infusion rate in gtt/minute. Round the result to the nearest whole number. Using these steps, we get: (infusion rate in mL/hour) = (630) / (7) = 90 mL/hour. (infusion rate in mL/minute) = (90) / (60) = 1.5 mL/minute. (infusion rate in gtt/minute) = (1.5) x (10) = 15 gtt/minute. (rounded infusion rate in gtt/minute) = 15.
Therefore, the nurse should regulate the infusion to deliver 15 gtt/minute of IV fluids to the client.
Question 4 of 5
A patient who weighs 91 kg receives a prescription for a continuous infusion of dopamine at 3 mcg/kg/min. The solution is labeled, “Dopamine 400 mg in 5% Dextrose injection 250 mL.†How many mL/hour should the nurse program the infusion pump to deliver?(Enter numeric value only. If rounding is required, round to the nearest tenth.)
Correct Answer: 10.2
Rationale:
To determine the infusion rate in mL/hour for the dopamine solution: Calculate the total dose per minute: 3 mcg/kg/min × 91 kg = 273 mcg/min. Convert mcg/min to mcg/hour: 273 mcg/min × 60 min/hour = 16,380 mcg/hour. Convert mcg to mg: 16,380 mcg ÷ 1,000 = 16.38 mg/hour. Determine the concentration of the solution: 400 mg ÷ 250 mL = 1.6 mg/mL. Calculate the mL/hour required: 16.38 mg/hour ÷ 1.6 mg/mL = 10.2375 mL/hour. Rounded to the nearest tenth: 10.2 mL/hour.
Question 5 of 5
The healthcare provider prescribes cefazolin 800 mg IM every six hours. The available vial is labeled, 'Cefazolin 1 gram,' and the instructions for reconstitution state, 'For IM use add 2.5 mL sterile water for injection to provide a total volume of 3.0 mL.' After reconstitution, the solution contains how many mg/mL? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Correct Answer: 333
Rationale:
To find the answer, we can use the following formula: (mg/mL) = (mg of cefazolin) / (mL of solution). Substituting the given values, we get: (mg/mL) = (1000) / (3). Simplifying, we get: (mg/mL) = 333.333. (rounded mg/mL) = 333.
Therefore, after reconstitution, the solution contains 333 mg/mL of cefazolin.