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
Given:
Infusion rate: 3 mL/hr
Concentration of Nitroglycerin: 50 mg in 250 mL D5W (200 mcg/mL)
Step 1: Calculate the dose in mg/hr:
Dose (mg/hr) = Infusion rate (mL/hr) x Concentration (mg/mL)
Dose (mg/hr) = 3 mL/hr x 200 mcg/mL
Dose (mg/hr) = 600 mcg/hr
Correct Answer is A
Explanation
Given:
Ordered dose of Heparin: 18 units/kg/hr
Patient weight: 123 pounds
Concentration of Heparin: 25,000 units/250 mL (100 units/mL)
Step 1: Convert patient weight from pounds to kilograms:
1 pound (lb) = 0.453592 kilograms (kg)
Patient weight in kg = 123 lbs x 0.453592 kg/lb = 55.7923 kg
Step 2: 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) = 18 units/kg/hr x 55.7923 kg
Total dose (units/hr) = 1004.2614 units/hr
Step 3: Calculate the infusion rate in mL/hr:
Infusion rate (mL/hr) = Total dose (units/hr) / Concentration (units/mL)
Infusion rate (mL/hr) = 1004.2614 units/hr / 100 units/mL
Infusion rate (mL/hr) = 10.042614 mL/hr
Step 4: Round to the nearest tenths:
Infusion rate (mL/hr) ≈ 10.0 mL/hr
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