Questions with Complete Solutions

Nursing Math for Meds Hesi Practice Questions with Complete Solutions

• **How many ml/hour should an infusion pump be set to deliver for a client prescribed 500 ml

of Dextrose 5% in 0.45% Sodium Chloride (D5½ NS) over 6 hours?**

✔✔83

*Rationale: 500 ml / 6 hours = 83.3 ml/hour, rounded to 83 ml/hour.*

• **For a gastrostomy tube feeding of 3/4 strength Ensure, how many ml of Ensure should be

used from a 240 ml can for each feeding?**

✔✔180

*Rationale: 240 ml x 0.75 = 180 ml Ensure + 60 ml water = 240 ml total.*

• **Using the Parkland formula, how much fluid should a 180-pound man with 60% body burns

receive in the first 24 hours?**

✔✔19632

*Rationale: Convert 180 lb to kg: 180 / 2.2 = 81.8 kg. Then, 4 ml x 81.8 kg x 60 = 19632 ml.*

• **How should a nurse adjust an infusion pump for a Heparin protocol decrease of 100

units/hour, given an initial rate of 1,000 units/hour and PTT of 76 seconds?** 1 / 3

✔✔18

*Rationale: Adjust to 900 units/hour. Using 900 units/hour and concentration 25,000 units in

500 ml: (900 units/25,000 units) x 500 ml = 18 ml/hour.*

• **How many ml remain to be infused if a secondary infusion of 265 ml was started 2 hours

ago at 85 ml/hour?**

✔✔95

*Rationale: 85 ml/hour x 2 hours = 170 ml infused. 265 ml - 170 ml = 95 ml remaining.*

• **At what rate should the nurse set the infusion pump for milrinone (Primacor) 10 mg in 100

ml of 0.9% saline at 46 mcg/min for a client in cardiogenic shock?**

✔✔28

*Rationale: Calculate mcg/hour: 46 mcg x 60 minutes = 2760 mcg/hour. Then, 10,000 mcg / 100 ml = 2760 mcg / X ml. X = 27.6 ml/hour, rounded to 28 ml/hour.*

• **How many ml of trimethoprim-sulfamethoxazole (Bactrim-DS Oral Suspension) should be

administered per dose if the prescription is 120 mg BID and the bottle is labeled 200 mg/5 ml?**

✔✔3

*Rationale: 120 mg / 200 mg x 5 ml = 3 ml.* 2 / 3

A client who has been NPO for 3 days is receiving an infusion of Dextrose 5% in 0.45% Sodium chloride (D51/2 NS) with potassium chloride (KCl) 20 mEq at 83 ml/hour. The client's 8-hour urine output is 400 ml, blood urea nitrogen (BUN) is 15 mg/dl (5.355 mmol/L), lungs are clear bilaterally, serum glucose is 110 mg/dl ( 6.1 mmol/L), and serum potassium is 3.7 mEq/L (3.7 mmol/L). Which action should the nurse implement? ✔✔Document in the medical record that these normal findings are expected outcomes Rationale The results are all within normal range (BUN 10 to 20 mg/dl or 3.6-7.1 mmol/L (SI units), serum glucose 70 to 110 mg/dl or less than 6.1 mmol/L (SI), and serum potassium 3.5 to 5.0 mEq/L or 3.5-5.0 mmol/L (SI units). The other actions are not indicated.

A loading dose of acetylcysteine (Mucomyst) 8 grams, which is available as a 20% solution (200 mg acetylcysteine per ml) is prescribed by nasogastric tube for a client with acetaminophen toxicity. How many ml of diluent should be added to the medication to obtain a 1:4 concentration? (Enter the numerical value only. If rounding is required, round to the whole number.) ✔✔120 Rationale

• grams = 8,000 mg prescribed dose.Using the formula, D/H x Q, 8,000 mg / 200 mg x 1 ml = 40

ml of the 20% solution.Dilute the 40 ml to a 1:4 concentration for administration using ratio and

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