A nurse is preparing to administer lorazepam 0.05 mg/kg IM to a client who weighs 132 lb. Available is lorazepam solution 2mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tent. Use a leading zero if it applies. Do not use a trailing zero)
The Correct Answer is ["1.5"]
Convert the Client's Weight from Pounds to Kilograms:
1 kg = 2.205 lbs
Weight in kg = 132 lbs / 2.205 lbs/kg
Weight in kg ≈ 59.86 kg
Calculate the Total Dose of Lorazepam Needed:
Dose = 0.05 mg/kg x 59.86 kg
Dose ≈ 2.993 mg
Calculate the Volume of Lorazepam to Administer:
Available concentration = 2 mg/mL
Volume (mL) = Desired dose (mg) / Available concentration (mg/mL)
Volume (mL) = 2.993 mg / 2 mg/mL
Volume (mL) ≈ 1.4965 mL
Round to the Nearest Tenth:
1.5 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["4"]
Explanation
Identify the Desired Dose and Available Concentration:
Desired Dose: 5 mg of enalapril
Available Concentration: 1.25 mg/mL (This means there are 1.25 mg of enalapril in every 1 mL of solution)
Set up the Calculation:
We need to find the volume (in mL) that contains the desired dose of 5 mg.
We can use the following formula:
Volume (mL) = Desired Dose (mg) / Available Concentration (mg/mL)
Plug in the Values and Calculate:
Volume (mL) = 5 mg / 1.25 mg/mL
Volume (mL) = 4 mL
Round to the Nearest Whole Number (if necessary):
4mL
Correct Answer is ["12.2"]
Explanation
Understanding the Problem
Initial Order: Nitroprusside 0.3 mcg/kg/min
Client Weight: 68 kg
Dose Increase: 0.3 mcg/kg/min every 5 minutes
Current BP: 208/150 mmHg (Indicates need for dose increase)
Available Solution: Nitroprusside 50 mg in 250 mL of D5W
Desired Rate: mL/hr
Step 1: Calculate the Initial Dose
Initial Dose: 0.3 mcg/kg/min
Client Weight: 68 kg
Initial Total Dose: 0.3 mcg/kg/min x 68 kg = 20.4 mcg/min
Step 2: Determine the New Dose After Increase
Increase: 0.3 mcg/kg/min
Client Weight: 68 kg
Total Increase: 0.3 mcg/kg/min x 68 kg = 20.4 mcg/min
New Total Dose: 20.4 mcg/min (initial) + 20.4 mcg/min (increase) = 40.8 mcg/min
Step 3: Convert the New Dose to Milligrams (mg)
1 mg = 1000 mcg
New Dose in mg/min: 40.8 mcg/min / 1000 mcg/mg = 0.0408 mg/min
Step 4: Calculate the New Dose in mg/hr
New Dose in mg/min: 0.0408 mg/min
Minutes in an Hour: 60 min
New Dose in mg/hr: 0.0408 mg/min x 60 min/hr = 2.448 mg/hr
Step 5: Determine the Concentration of the Nitroprusside Solution
Available Nitroprusside: 50 mg
Solution Volume: 250 mL
Concentration: 50 mg / 250 mL = 0.2 mg/mL
Step 6: Calculate the Infusion Rate in mL/hr
New Dose in mg/hr: 2.448 mg/hr
Concentration: 0.2 mg/mL
Infusion Rate: 2.448 mg/hr / 0.2 mg/mL = 12.24 mL/hr
Step 7: Round to the Nearest Tenth
The calculated rate is 12.24 mL/hr.
Rounded to the nearest tenth: 12.2 mL/hr
Answer: 12.2 mL/hr
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