HESI RN
RN Hesi Med Surg Dosage Calculations Questions
Extract:
Question 1 of 5
A client scheduled for coronary artery bypass surgery is to receive an intravenous infusion of 1 gram cefazolin in 50 mL 0.9% Sodium Chloride, USP over 30 minutes. The nurse should program the infusion pump to deliver how many mL/hour? (Enter numeric value only, as a whole number.)
Correct Answer: 100
Rationale: Infusion rate = Volume / Time. Volume is 50 mL, time is 30 minutes = 0.5 hours. So, 50 / 0.5 = 100 mL/hour.
Question 2 of 5
A client who weighs 176 pounds receives a prescription for lorazepam 0.05 mg/kg intramuscularly 2 hours before a scheduled procedure. The medication is available in 4 mg/ml vial. How many ml should the nurse administer? (Enter numerical value only.)
Correct Answer: 1
Rationale: Weight: 176 / 2.2 = 80 kg. Dose: 0.05 mg/kg × 80 = 4 mg. Volume: 4 / 4 = 1 mL.
Question 3 of 5
The nurse is preparing to administer methylprednisolone 40 mg IV. The medication vial is labeled '125 mg per 2 mL.' How many mL of medication should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest hundredth.)
Correct Answer: 0.64
Rationale: Concentration: 125 mg / 2 mL = 62.5 mg/mL. Volume = 40 / 62.5 = 0.64 mL.
Question 4 of 5
A client 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/hr 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: Calculate dose: 3 mcg/kg/min × 91 kg = 273 mcg/min. Convert to hourly: 273 × 60 = 16380 mcg/hour. Concentration: 400 mg = 400000 mcg in 250 mL = 1600 mcg/mL. Infusion rate = 16380 / 1600 = 10.2375 mL/hour, rounded to 10.2.
Question 5 of 5
The healthcare provider prescribes heparin 1,400 units/hour intravenously (IV). The IV bag contains heparin 20,000 units in 250 mL dextrose 5% in water. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Correct Answer: 18
Rationale: Infusion rate = (1400 units/hour × 250 mL) / 20000 units = 17.5 mL/hour, rounded to 18.