The healthcare provider orders dobutamine at 12 mcg/kg/min. The client weighs 75 kg. The pharmacy provides 250 mL of D5W with 1 g of dobutamine. How many mL/hr should the IV pump be programmed for? (Round to a whole number.)
13
140
14
134
The Correct Answer is C
A. This is an underestimation due to a miscalculation of the dose rate.
B. This is an overestimation due to a miscalculation of the dose rate.
C. 1. Calculate the desired dose of dobutamine:
Desired dose (mcg/min) = Dose per kg (mcg/kg/min) x Weight (kg)
Desired dose (mcg/min) = 12 mcg/kg/min x 75 kg = 900 mcg/min
2. Convert mcg/min to mg/hr:
900 mcg/min x 60 min/hr = 54,000 mcg/hr
54,000 mcg/hr ÷ 1000 mcg/mg = 54 mg/hr
3. Calculate the concentration of dobutamine in the solution:
Concentration (mg/mL) = Total amount of dobutamine (mg) / Total volume (mL)
Concentration (mg/mL) = 1000 mg (1 g) / 250 mL = 4 mg/mL
4. Calculate the infusion rate (mL/hr):
Infusion rate (mL/hr) = Desired dose (mg/hr) / Concentration (mg/mL)
Infusion rate (mL/hr) = 54 mg/hr / 4 mg/mL = 13.5 mL/hr
5. Round to the nearest whole number:
Infusion rate (mL/hr) = 14 mL/hr
Therefore, the IV pump should be programmed for 14 mL/hr.
D. This is an overestimation due to a miscalculation of the dose rate.
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Naxlex Comprehensive Predictor Exams
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Correct Answer is D
Explanation
A. Potassium chloride is used to treat hypokalemia, not as a warfarin antidote.
B. Vitamin E does not counteract warfarin’s effects and may increase bleeding risk.
C. Protamine sulfate is the antidote for heparin, not warfarin.
D. Vitamin K is the appropriate antidote for excessive warfarin, as it promotes the synthesis of clotting factors inhibited by warfarin.
Correct Answer is B
Explanation
A. Blurred vision is not a typical symptom of left-sided heart failure.
B. Difficulty breathing while performing activities, such as climbing stairs, is a classic symptom of left-sided heart failure due to pulmonary congestion.
C. Increased water intake is not directly indicative of left-sided heart failure.
D. Nocturia can occur in heart failure, but it is less specific than dyspnea on exertion.
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