A nurse is preparing to administer potassium glucose 40 mEq PO. Available is potassium gluconate liquid 20 mEq/15 mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["30"]
Understanding the Problem
Order: Potassium gluconate 40 mEq PO
Available Solution: Potassium gluconate liquid 20 mEq/15 mL
Desired Dose: mL to administer
Step 1: Set Up the Calculation
We need to find the volume (in mL) that contains the ordered dose (40 mEq). We can do this by setting up a proportion or using the formula:
Volume (mL) = (Ordered Dose (mEq) / Concentration (mEq/mL))
Step 2: Determine the Concentration
Available Concentration: 20 mEq / 15 mL
Step 3: Perform the Calculation
Ordered Dose: 40 mEq
Concentration: 20 mEq / 15 mL
Volume: (40 mEq) / (20 mEq / 15 mL) = (40 mEq X 15 mL) / 20 mEq
We can simplify this by dividing 40 by 20:
Volume: (2 X 15 mL) = 30 mL
Step 4: Round to the Nearest Whole Number
The result is 30 mL, which is already a whole number.
Answer: 30 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["6"]
Explanation
Order: Dopamine 2 mcg/kg/min
Client Weight: 176 lbs
Available Solution: Dopamine 400 mg in 250 mL of D5W
Desired Rate: mL/hr
Convert Client Weight to Kilograms (kg)
1 kg = 2.2 lbs
Client Weight in kg: 176 lbs / 2.2 lbs/kg = 80 kg
Step 2: Calculate the Dopamine Dose per Minute
Dose: 2 mcg/kg/min
Client Weight: 80 kg
Total Dose per Minute: 2 mcg/kg/min x 80 kg = 160 mcg/min
Step 3: Convert Dopamine Dose to Milligrams (mg)
1 mg = 1000 mcg
Dose in mg/min: 160 mcg/min / 1000 mcg/mg = 0.16 mg/min
Step 4:Calculate the Dopamine Dose per Hour
Dose in mg/min: 0.16 mg/min
Minutes in an Hour: 60 min
Dose in mg/hr: 0.16 mg/min x 60 min/hr = 9.6 mg/hr
Step 5: Determine the Concentration of the Dopamine Solution
Available Dopamine: 400 mg
Solution Volume: 250 mL
Concentration: 400 mg / 250 mL = 1.6 mg/mL
Step 6: Calculate the Infusion Rate in mL/hr
Dose in mg/hr: 9.6 mg/hr
Concentration: 1.6 mg/mL
Infusion Rate: 9.6 mg/hr / 1.6 mg/mL = 6 mL/hr
Step 7: Round to the Nearest Whole Number
The calculated rate is 6 mL/hr, which is already a whole number.
Answer: 6 mL/hr
Correct Answer is ["38"]
Explanation
Convert Grams to Milligrams:
The available lidocaine is 1 gram (g).
We need to convert this to milligrams (mg) because the dose is in mg/min.
There are 1000 milligrams in 1 gram (1 g = 1000 mg).
So, 1 g x 1000 mg/g = 1000 mg
Calculate the Lidocaine Concentration in mg/mL:
Available lidocaine: 1000 mg
Total volume: 250 mL
Concentration: 1000 mg / 250 mL = 4 mg/mL
Calculate the Lidocaine Dose in mg/hr:
Dose: 2.5 mg/min
There are 60 minutes in 1 hour.
Dose in mg/hr: 2.5 mg/min x 60 min/hr = 150 mg/hr
Calculate the Infusion Rate in mL/hr:
Concentration: 4 mg/mL
Dose in mg/hr: 150 mg/hr
Infusion Rate (mL/hr) = Dose in mg/hr / Concentration (mg/mL)
Infusion Rate (mL/hr) = 150 mg/hr / 4 mg/mL = 37.5 mL/hr
Round to the Nearest Whole Number:
38 mL/hr
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