A client prescribed lithium carbonate 300 mg twice daily a month ago comes to the Emergency Department with mental confusion, frequent urination in large amounts, and coarse tremors. Which lithium level would the nurse expect?

0.8 mEq/L

2.3 mEq/L

1.8 mEq/L

1.2 mEq/L

Answer and Explanation

The Correct Answer is B

Choice A Reason: 0.8 mEq/L

The therapeutic range for lithium is typically between 0.6 and 1.2 mEq/L. A level of 0.8 mEq/L falls within this range and is considered normal. Therefore, it is unlikely that a client with this lithium level would present with symptoms such as mental confusion, frequent urination, and coarse tremors. These symptoms are more indicative of lithium toxicity, which occurs at higher levels.

Choice B Reason: 2.3 mEq/L

A lithium level of 2.3 mEq/L is significantly above the therapeutic range and indicates lithium toxicity. Symptoms of lithium toxicity include mental confusion, frequent urination, and coarse tremors, which match the client’s presentation. Severe toxicity can occur at levels above 2.0 mEq/L and can be life-threatening if not treated promptly. Therefore, this is the most likely lithium level for the client described.

Choice C Reason: 1.8 mEq/L

A lithium level of 1.8 mEq/L is above the therapeutic range but below the level typically associated with severe toxicity. While some symptoms of toxicity might appear at this level, they are generally less severe than those described in the scenario. The client’s symptoms suggest a more severe level of toxicity, making this choice less likely.

Choice D Reason: 1.2 mEq/L

A lithium level of 1.2 mEq/L is at the upper limit of the therapeutic range. While it is possible for some mild side effects to occur at this level, the severe symptoms described (mental confusion, frequent urination, and coarse tremors) are more indicative of a higher, toxic level of lithium. Therefore, this choice is also less likely.

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Correct Answer is A

Explanation

Choice A Reason: Their full therapeutic potential may not be reached until 4 weeks

This statement is correct. Tricyclic antidepressants (TCAs) often take several weeks to reach their full therapeutic effect. Patients may start to notice some improvement within one to two weeks, but it can take up to four weeks or longer for the full benefits to be realized1. This delayed onset is due to the time it takes for the medication to build up in the system and exert its effects on neurotransmitter levels.

Choice B Reason: Aged cheese should not be eaten while taking them

This statement is incorrect. The dietary restriction of avoiding aged cheese is associated with monoamine oxidase inhibitors (MAOIs), not tricyclic antidepressants. MAOIs can cause dangerous interactions with tyramine, a substance found in aged cheese and other foods, leading to hypertensive crises. TCAs do not have this dietary restriction.

Choice C Reason: They should not be given with antianxiety agents

This statement is incorrect. Tricyclic antidepressants can be used in conjunction with antianxiety agents under medical supervision. However, it is important to monitor for potential interactions and side effects. The combination can be beneficial for patients with comorbid depression and anxiety disorders.

Choice D Reason: They may cause hypomania or recent memory impairment

This statement is partially correct but not the best indicator of understanding. While TCAs can cause side effects such as memory impairment and, in rare cases, hypomania, these are not the primary concerns when teaching about the medication. The focus should be on understanding the therapeutic timeline and common side effects.

Correct Answer is ["5"]

Explanation

Step 1: Determine the concentration of Heparin in units per mL. 25,000 units ÷ 250 mL = 100 units per mL Result: 100

Step 2: Determine the rate in mL per hour needed to deliver 500 units per hour. 500 units ÷ 100 units per mL = 5 mL per hour Result: 5 mL per hour

The nurse should set the infusion pump to deliver at a rate of 5 mL per hour.

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A client prescribed lithium carbonate 300 mg twice daily a month ago comes to the Emergency Department with mental confusion, frequent urination in large amounts, and coarse tremors. Which lithium level would the nurse expect?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

The nurse assesses that medication teaching about tricyclic antidepressants was understood when the client states:

Correct Answer is A

Explanation

A client is to receive a continuous Heparin infusion at s00 units per hour. Pharmacy supplies Heparin in a concentration of 25,000 units per 250mL of NSS. Calculate the rate at which the nurse should set the infusion pump.

Correct Answer is ["5"]

Explanation

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