The patient is receiving nitroglycerin 55 mcg/min.
Available: Nitroglycerin in 5% Dextrose Injection 25 mg per 250 mL (100 mcg/mL)
What is the flow rate?
3 mL/hr
55 mL/hr
30 mL/hr
33 mL/hr
The Correct Answer is D
Convert the dosage to mcg per hour:
55 mcg/min × 60 min = 3300 mcg/hr
Determine the concentration of nitroglycerin available:
The concentration is 25 mg per 250 mL, which converts to 100 mcg/mL.
Calculate the flow rate in mL per hour using the dosage and concentration:
Flow rate (mL/hr)=(Dose (mcg/hr)/Concentration (mcg/mL))
(3300 mcg/hr100 mcg/mL)=33 mL/hr
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Convert ounces to millilitres (1 oz = 29.5735 mL):
6oz×29.5735mL/oz=177.441mL6
Calculate the frequency of doses per day:
The patient receives a dose every 4 hours, so in 24 hours, the number of doses is:
24hours/4hours/dose=6doses
Calculate the total volume for all doses:
177.441mL/dose×6doses=1064.646mL
Rounding to the nearest whole number=1080 mL
Correct Answer is B
Explanation
Given:
Ordered dose of phenobarbital: 6 mg/kg/day divided equally every 12 hours
Patient weight: 44 lbs
Concentration of phenobarbital elixir: 20 mg/5 mL
Step 1: Convert patient weight from pounds to kilograms:
1 pound (lb) = 0.453592 kilograms (kg)
Patient weight in kg = 44 lbs x 0.453592 kg/lb = 19.958 kg
Step 2: Calculate the total daily dose of phenobarbital:
Total daily dose (mg) = Ordered dose (mg/kg/day) x Patient weight (kg)
Total daily dose (mg) = 6 mg/kg/day x 19.958 kg
Total daily dose (mg) = 119.748 mg/day
Step 3: Calculate the dose per administration:
Dose per administration (mg) = Total daily dose (mg) / Number of administrations per day
Dose per administration (mg) = 119.748 mg/day / 2 administrations/day
Dose per administration (mg) = 59.874 mg
Step 4: Calculate the volume to be administered per dose:
Volume (mL) = Dose per administration (mg) / Concentration (mg/mL)
Volume (mL) = 59.874 mg / (20 mg/5 mL)
Volume (mL) = 59.874 mg x (5 mL / 20 mg)
Volume (mL) = 14.9685 mL
Step 5: Round to the nearest whole number:
Volume (mL) ≈ 15 mL
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