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 ["0.4"]
Explanation
Given:
Ordered dose of methylprednisolone succinate: 1.5 mg/kg/day IV in divided doses every 6 hours
Child's weight: 42 kg
Concentration of methylprednisolone succinate: 40 mg/mL
Step 1: Calculate the total daily dose of methylprednisolone succinate:
Total daily dose (mg) = Ordered dose (mg/kg/day) x Child's weight (kg)
Total daily dose (mg) = 1.5 mg/kg/day x 42 kg
Total daily dose (mg) = 63 mg/day
Step 2: Calculate the dose per administration:
Since the medication is given every 6 hours, there are 4 administrations per day.
Dose per administration (mg) = Total daily dose (mg) / Number of administrations per day
Dose per administration (mg) = 63 mg/day / 4 administrations/day
Dose per administration (mg) = 15.75 mg
Step 3: Calculate the volume to be administered per dose:
Volume (mL) = Dose per administration (mg) / Concentration (mg/mL)
Volume (mL) = 15.75 mg / 40 mg/mL
Volume (mL) = 0.39375 mL
Step 4: Round to the nearest tenth:
Volume (mL) ≈ 0.4 mL
Correct Answer is ["1.5"]
Explanation
Given:
Ordered dose of Ketorolac: 45 mg IM every 6 hours
Concentration of Ketorolac: 30 mg/mL
Step 1: Set up the proportion:
Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL)
Step 2: Substitute the values:
45 mg / Volume = 30 mg/mL
Step 3: Solve for the unknown volume:
Volume = 45 mg / (30 mg/mL)
Volume = 45 mg x (1 mL / 30 mg)
Volume = 1.5 mL
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