A nurse is preparing to administer dopamine 3mcg/kg/min by continuous IV infusion to a preschooler who weighs 41.8 bs. Available is dopamine 400 mg in dextrose 596 in water (D5W) 250 mL. The nurse should set the IV pump to deliver how many ml/hr? (Round to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
2.1 mL/hr
12.5 mL/hr
35.6 mL/hr
20.2 mL/hr
The Correct Answer is A
Given:
Ordered dose of Dopamine: 3 mcg/kg/min
Child's weight: 41.8 lbs
Concentration of Dopamine: 400 mg in 250 mL D5W
Step 1: Convert child's weight from pounds to kilograms:
1 pound (lb) = 0.453592 kilograms (kg)
Child's weight in kg = 41.8 lbs x 0.453592 kg/lb = 18.935 kg
Step 2: Calculate the total dose of Dopamine in mcg/min:
Total dose (mcg/min) = Ordered dose (mcg/kg/min) x Child's weight (kg)
Total dose (mcg/min) = 3 mcg/kg/min x 18.935 kg
Total dose (mcg/min) = 56.805 mcg/min
Step 3: Convert mcg to mg:
Total dose (mg/min) = Total dose (mcg/min) / 1000 mcg/mg
Total dose (mg/min) = 56.805 mcg/min / 1000 mcg/mg
Total dose (mg/min) = 0.056805 mg/min
Step 4: Calculate the total dose in mg/hr:
Total dose (mg/hr) = Total dose (mg/min) x 60 min/hr
Total dose (mg/hr) = 0.056805 mg/min x 60 min/hr
Total dose (mg/hr) = 3.4083 mg/hr
Step 5: Calculate the infusion rate in mL/hr:
Infusion rate (mL/hr) = Total dose (mg/hr) / Concentration (mg/mL)
Infusion rate (mL/hr) = 3.4083 mg/hr / (400 mg/250 mL)
Infusion rate (mL/hr) = 3.4083 mg/hr x (250 mL/400 mg)
Infusion rate (mL/hr) = 2.1301875 mL/hr
Step 6: Round to the nearest tenth:
Infusion rate (mL/hr) ≈ 2.1 mL/hr
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A) Potassium level of 3.0 mEq/L:
A potassium level of 3.0 mEq/L is below the normal range (3.5-5.0 mEq/L) and indicates hypokalemia. This is a critical finding for a patient taking digoxin. Hypokalemia increases the risk of digoxin toxicity because low potassium levels enhance the action of digoxin on the heart, potentially leading to arrhythmias. Therefore, the nurse should immediately report this finding to the provider for correction of the potassium imbalance.
B) BP of 132/82 mm Hg:
A blood pressure of 132/82 mm Hg is within the normal to slightly elevated range for adults. There is no immediate cause for concern related to the administration of digoxin, as this value is not indicative of hypotension or any immediate contraindication.
C) Digoxin level of 1.2 ng/mL:
A digoxin level of 1.2 ng/mL is within the therapeutic range (0.5-2.0 ng/mL). There is no indication that this level would need to be reported, as it is appropriate for digoxin therapy and not indicative of toxicity.
D) Heart rate of 66/min:
A heart rate of 66/min is within the normal range for an adult at rest (60-100 bpm). A heart rate below 60 bpm may warrant further assessment when taking digoxin, as it can cause bradycardia. However, a heart rate of 66 is not alarming and does not necessitate reporting to the provider, as it is still within an acceptable range for most individuals.
Correct Answer is A
Explanation
Given:
Ordered dose of Heparin: 15 units/kg/hr
Patient weight: 82 kg
Total Heparin in solution: 25,000 units
Volume of solution: 250 mL
Step 1: Calculate the total dose of Heparin in units/hr:
Total dose (units/hr) = Ordered dose (units/kg/hr) x Patient weight (kg)
Total dose (units/hr) = 15 units/kg/hr x 82 kg
Total dose (units/hr) = 1230 units/hr
Step 2: Calculate the concentration of Heparin in the solution:
Concentration (units/mL) = Total Heparin (units) / Volume of solution (mL)
Concentration (units/mL) = 25,000 units / 250 mL
Concentration (units/mL) = 100 units/mL
Step 3: Calculate the infusion rate in mL/hr:
Infusion rate (mL/hr) = Total dose (units/hr) / Concentration (units/mL)
Infusion rate (mL/hr) = 1230 units/hr / 100 units/mL
Infusion rate (mL/hr) = 12.3 mL/hr
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