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After assessing a client, a primary healthcare provider prescribes diphenhydramine 25 mg IV STAT for anaphylaxis. The pharmacy supplies a vial with a concentration of 50 mg/mL.
How much and when should a nurse administer this medication?

Administer 0.5 mL of medication immediately to the client

Administer 25 mg of medication once a day to the client for two weeks

Administer 25 mg of medication every eight hours

Administer 0.5 mL of medication if the client has symptoms of allergy

Answer and Explanation

The Correct Answer is A

To find how much medication to administer, you need to calculate the following:

- The volume of diphenhydramine in milliliters
- The infusion time in minutes

First, divide the dose of diphenhydramine by the concentration to get the volume in milliliters:

25 mg / 50 mg/mL = 0.5 mL diphenhydramine should be diluted in 10 to 20 mL of normal saline and infused over at least 2 minutes.

Therefore, the nurse should administer **0.5 mL** of diphenhydramine diluted in 10 to 20 mL of normal saline over **at least 2 minutes**.

The nurse should administer this medication **as soon as possible** after receiving the order and the medication from the pharmacy, as STAT means immediately or urgently. The nurse should also monitor the client for signs of improvement or adverse reactions.

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Correct Answer is A

Explanation

To find the milligrams per minute, you need to calculate the following:

- The volume of Lopressor in milliliters
- The infusion rate in milliliters per minute using the formula: Infusion rate (mL/min) = Total volume (mL) / Time (min)
- The dose of Lopressor in milligrams per minute using the formula: Dose (mg/min) = Infusion rate (mL/min) x Concentration (mg/mL)

First, divide the dose of Lopressor by the concentration to get the volume in milliliters:

5 mg / 1 mg/mL = 5 mL

Next, use the formula for infusion rate to find how many milliliters per minute the IV pump should deliver:

Infusion rate (mL/min) = Total volume (mL) / Time (min)

Since the total volume is 5 mL and the time is 2 minutes, plug in these values into the formula:

Infusion rate (mL/min) = 5 mL / 2 min

Simplify and solve for the infusion rate:

Infusion rate (mL/min) = 2.5 mL/min

Then, use the formula for dose to find how many milligrams per minute the patient should receive:

Dose (mg/min) = Infusion rate (mL/min) x Concentration (mg/mL)

Since the infusion rate is 2.5 mL/min and the concentration is 1 mg/mL, plug in these values into the formula:

Dose (mg/min) = 2.5 mL/min x 1 mg/mL

Simplify and solve for the dose:

Dose (mg/min) = 2.5 mg/min

Therefore, the patient should receive **2.5 mg/min** of Lopressor.

A. 78 mL/hr B. 105 mL/hr C. 60 mL/hr D. 16 mL/hr

Correct Answer is A

Explanation

To calculate the infusion rate, we need to convert the patient's weight from kilograms to milligrams.

Patient's weight: 65 kg

Dose required: 200 mcg/kg/min

First, let's calculate the total dose required for the patient per minute: Dose required = 200 mcg/kg/min * 65 kg

= 13,000 mcg/min

Next, we need to convert the dose from micrograms to milligrams:

13,000 mcg/min = 13 mg/min

Now, let's determine the infusion rate. We have 2,500 mg of esmolol in 250 mL of ﬂuid. Therefore, the concentration of esmolol in the ﬂuid is:

Concentration = 2,500 mg / 250 mL

= 10 mg/mL

To find the infusion rate, we divide the dose required by the concentration: Infusion rate = 13 mg/min / 10 mg/mL

= 1.3 mL/mi

Since the options are in mL/hr, we need to convert the rate from mL/min to mL/hr:

1.3 mL/min * 60 min/hr = 78 mL/hr

Therefore, the correct answer is:

a. 78 mL/hr

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After assessing a client, a primary healthcare provider prescribes diphenhydramine 25 mg IV STAT for anaphylaxis. The pharmacy supplies a vial with a concentration of 50 mg/mL. How much and when should a nurse administer this medication?

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Naxlex Comprehensive Predictor Exams

A patient is ordered 5 mg of IV Lopressor (metoprolol tartrate) to be administered over 2 minutes. The concentration is 1 mg/1 mL. How many milligrams per minute should the patient receive?

Correct Answer is A

Explanation

A nurse needs to infuse esmolol to a patient weighing 65 kg. The dose on hand is 2,500 mg esmolol in 250 mL of ﬂuid. The patient requires a dose of 200 mcg/kg/min to control a hypertensive crisis. Which rate should the nurse calculate to infuse this medication? Round to the nearest whole number.

Correct Answer is A

Explanation

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After assessing a client, a primary healthcare provider prescribes diphenhydramine 25 mg IV STAT for anaphylaxis. The pharmacy supplies a vial with a concentration of 50 mg/mL.
How much and when should a nurse administer this medication?