A patient weighing 132 lb is prescribed lorazepam 44 mcg/kg IV to be administered 20 minutes before a scheduled procedure.
The medication is available in a 2 mg/mL vial.
How many mL should the nurse administer? Round off to 2 d.p.
(This is a medical math nd does not require options.)
The Correct Answer is ["1.32"]
Step 1 is to convert the patient’s weight from pounds to kilograms. There are approximately 2.2046 pounds in 1 kilogram. So, the patient’s weight in kilograms is 132 lb ÷ 2.2046 = 59.87 kg.
Step 2 is to calculate the total dose of lorazepam the patient should receive. The prescribed dose is 44 mcg/kg. So, the total dose in micrograms is 44 mcg/kg × 59.87 kg = 2634.28 mcg.
Step 3 is to convert the total dose from micrograms to milligrams. There are 1000 micrograms in 1 milligram. So, the total dose in milligrams is 2634.28 mcg ÷ 1000 = 2.63428 mg.
Step 4 is to calculate the volume of lorazepam solution to administer. The concentration of the solution is 2 mg/mL. So, the volume in milliliters is 2.63428 mg ÷ 2 mg/mL = 1.31714 mL. Therefore, the nurse should administer approximately 1.32 mL of the lorazepam solution, rounding to the nearest hundredth as required.
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Naxlex Comprehensive Predictor Exams
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Correct Answer is A
Explanation
Choice A rationale
The patient’s history indicates that she had difficulty breathing during a hike. This event led her to the emergency department. Difficulty breathing during physical activity such as hiking can be a symptom of an asthma exacerbation.
Choice B rationale
While severe allergic reactions can cause difficulty breathing, the patient’s history does not indicate that she experienced an allergic reaction prior to her emergency department visit.
Choice C rationale
Panic attacks can cause symptoms such as rapid heart rate, sweating, and shortness of breath. However, the patient’s history does not indicate that she had a panic attack prior to her emergency department visit.
Choice D rationale
Fainting, or loss of consciousness, can be caused by various conditions, including dehydration, low blood sugar, and heart problems. However, the patient’s history does not indicate that she fainted prior to her emergency department visit.
Correct Answer is C
Explanation
Choice A rationale
While a headache with sudden onset can be a symptom of various conditions, it is not the most critical finding to report in a client with atrial fibrillation and a rapid ventricular rate.
Choice B rationale
Flat jugular vein distention (JVD) at 45 degrees is not the most critical finding to report in a client with atrial fibrillation and a rapid ventricular rate.
Choice C rationale
An abnormal level of consciousness can be a sign of decreased cerebral perfusion, which can occur in a client with atrial fibrillation and a rapid ventricular rate. This is a critical finding that should be reported to the healthcare provider immediately.
Choice D rationale
Nausea with vomiting is not the most critical finding to report in a client with atrial fibrillation and a rapid ventricular rate.
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