A nurse is teaching a class about pharmacodynamics. The nurse should include that which of the following medication levels occurs when a medication is at the lowest serum concentration?

Half-life

Peak

Toxic

Trough

Answer and Explanation

The Correct Answer is D

D) Trough:
The trough level of a medication is the lowest concentration of the drug in the bloodstream before the next dose is administered. Monitoring the trough level helps ensure that the medication stays within a therapeutic range, minimizing the risk of toxicity and ensuring effectiveness.

A) Half-life:
Half-life refers to the time it takes for the concentration of a drug in the blood to decrease by half. It is related to how long the drug stays in the system but does not specifically indicate the lowest concentration.

B) Peak:
The peak level is the highest concentration of the drug in the bloodstream after administration. It is used to assess the maximum effect of the drug, not the lowest concentration.

C) Toxic:
Toxic level refers to the concentration of a drug at which it can cause adverse effects or toxicity. It is not related to the lowest concentration but rather to potentially harmful levels.

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Free Nursing Study Resources

Correct Answer is ["0.2"]

Explanation

Calculating the Morphine Sulfate Dose:Problem: Administer 2 mg of morphine sulfate IV bolus. The available concentration is 10 mg/mL.

Steps:

Set up a proportion:

We want to find the number of milliliters (mL) needed.

We know the desired dose (2 mg) and the concentration of the medication (10 mg/mL).

Proportion:

x mL / 2 mg = 1 mL / 10 mg

Cross-multiply:

10x = 2

Solve for x:

x = 2 / 10

x = 0.2

Answer: The nurse should administer 0.2 mL of morphine sulfate per dose.

Correct Answer is ["8.33"]

Explanation

Calculating the IV Infusion Rate

Problem: Infuse 150 mL of D5W over 3 hours using a tubing with a drop factor of 10 gtt/mL.

Steps:

Convert hours to minutes:

3 hours x 60 minutes/hour = 180 minutes

Calculate the total drops:

150 mL x 10 gtt/mL = 1500 gtt

Calculate the drops per minute:

1500 gtt / 180 minutes = 8.33 gtt/min

The nurse should set the manual IV infusion to deliver 8 gtt/min. (Rounding 8.33 to the nearest whole number.)

View Question and Answer

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A nurse is teaching a class about pharmacodynamics. The nurse should include that which of the following medication levels occurs when a medication is at the lowest serum concentration?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is preparing to administer morphine sulfate 2 mg IV bolus. Available is morphine sulfate 10 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Correct Answer is ["0.2"]

Explanation

Correct Answer is ["8.33"]

Explanation

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