A nurse is preparing to administer nitroglycerine 15 mcg/min by continuous IV infusion. Available is nitroglycerin 25 mg in 250 mL of dextrose 5% in water (D5W). The nurse should set the IV pump to deliver how many mL/hr? (Round to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.
9
19
0.9
90
The Correct Answer is A
Convert the dosage to mcg per hour:
15 mcg/min×60 min/hr=900 mcg/hr15
Convert the available nitroglycerin concentration to mcg/mL:
25 mg=25,000 mcg
The concentration is(25,000 mcg/250 mL)=100 mcg
Calculate the flow rate in mL per hour using the dosage and concentration:
Flow rate (mL/hr)=(900 mcg/hr100 mcg/mL)=9 mL/hr
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A) Diazepam
Diazepam (a benzodiazepine) is the first-line treatment for status epilepticus, especially in emergency situations. It works by quickly calming overactive electrical activity in the brain and can be administered intravenously for rapid effect. Diazepam is commonly given as an initial treatment due to its fast onset of action in stopping seizures.
B) Phenobarbital
Phenobarbital is an anticonvulsant that can also be used for seizures, but it is typically used in cases where seizures persist after initial treatment, or as a long-term maintenance therapy. It is not the first-line drug for status epilepticus and is typically administered after other options like diazepam have been tried.
C) Valproic acid
Valproic acid is an anticonvulsant used for chronic seizure management (like for generalized seizures and some focal seizures), but it is not typically used as the immediate treatment in status epilepticus. It may be used in the long-term management or when other drugs fail, but diazepam or lorazepam are preferred for immediate control of seizures.
D) Phenytoin
Phenytoin is another commonly used anticonvulsant, but it has a slower onset of action compared to benzodiazepines like diazepam. While phenytoin is often used for long-term seizure prevention, it is not the most immediate choice in an emergency setting. After initial seizure control with a benzodiazepine, phenytoin may be given for continued seizure prevention.
Correct Answer is A
Explanation
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
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