The healthcare provider prescribes lorazepam 50 mcg/kg IM two hours before a scheduled procedure for a client who weighs 74 kg. The medication is "Available in 2mg/mL vial." How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
The Correct Answer is ["1.9"]
Given:
Ordered dose of Lorazepam: 50 mcg/kg
Patient weight: 74 kg
Concentration of Lorazepam: 2 mg/mL
Step 1: Calculate the total dose of Lorazepam:
Total dose (mcg) = Ordered dose (mcg/kg) x Patient weight (kg)
Total dose (mcg) = 50 mcg/kg x 74 kg
Total dose (mcg) = 3700 mcg
Step 2: Convert mcg to mg:
Total dose (mg) = Total dose (mcg) / 1000 mcg/mg
Total dose (mg) = 3700 mcg / 1000 mcg/mg
Total dose (mg) = 3.7 mg
Step 3: Calculate the volume to be administered:
Volume (mL) = Total dose (mg) / Concentration (mg/mL)
Volume (mL) = 3.7 mg / 2 mg/mL
Volume (mL) = 1.85 mL
Step 4: Round to the nearest tenth:
Volume (mL) ≈ 1.9 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["42"]
Explanation
Given:
Volume of fluid: 1 liter = 1000 mL
Infusion time: 8 hours
Drop factor: 20 gtt/mL
Formula:
Flow rate (gtt/min) = (Volume (mL) / Time (hr)) x Drop factor (gtt/mL) / 60 min/hr
Step 1: Calculate the infusion rate in mL/hr:
Infusion rate (mL/hr) = Volume (mL) / Time (hr)
Infusion rate (mL/hr) = 1000 mL / 8 hr
Infusion rate (mL/hr) = 125 mL/hr
Step 2: Calculate the flow rate in gtt/min:
Flow rate (gtt/min) = (Infusion rate (mL/hr) x Drop factor (gtt/mL)) / 60 min/hr
Flow rate (gtt/min) = (125 mL/hr x 20 gtt/mL) / 60 min/hr
Flow rate (gtt/min) = 2500 gtt/hr / 60 min/hr
Flow rate (gtt/min) = 41.667 gtt/min
Step 3: Round to the nearest whole number:
Flow rate (gtt/min) ≈ 42 gtt/min
Correct Answer is ["8"]
Explanation
Given:
Ordered infusion rate: 320 units/hour
Concentration of Heparin: 20,000 units in 500 mL (40 units/mL)
Formula:
Infusion rate (mL/hr) = Infusion rate (units/hr) / Concentration (units/mL)
Step 1: Calculate the infusion rate in mL/hr:
Infusion rate (mL/hr) = 320 units/hr / 40 units/mL
Infusion rate (mL/hr) = 8 mL/hr
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