What advice should a nurse give to a patient on lithium therapy?

AIIMS Delhi NO- 2019

Psychiatric Nursing

Hard

Appeared in: AIIMS Delhi NO- 2019

Explanation

Lithium has a narrow therapeutic window (0.6-1.2 mEq/L), making toxicity a significant and dangerous risk.
Lithium is excreted by the kidneys, and its clearance is directly affected by the body's hydration and sodium status.
Dehydration causes the kidneys to reabsorb more lithium along with sodium and water, leading to a rapid increase in serum lithium levels.
Advising the patient to maintain a high fluid intake (2-3 liters per day) is the most critical intervention to ensure stable renal excretion of lithium and prevent toxicity.

Option B: While taking lithium with food is recommended to reduce gastrointestinal irritation, it addresses a side effect for comfort. Preventing potentially fatal toxicity through hydration is the primary safety priority.
Option C: This advice is incorrect because taking lithium on an empty stomach is known to exacerbate gastrointestinal side effects such as nausea, vomiting, and diarrhea.
Option D: This advice is contraindicated. A common side effect of long-term lithium therapy is weight gain. Therefore, a high-calorie diet is inappropriate and could worsen this side effect.

Clinical Relevance

Nursing practice connection: Use the key finding related to Patient education and safety for lithium therapy to guide bedside assessment, documentation, and the next nursing action.
Patient education is a primary nursing responsibility for high-risk drugs like lithium to ensure adherence and prevent life-threatening adverse events.
Nurses must teach patients and their families to recognize and immediately report early signs of toxicity, such as coarse tremors, confusion, and severe diarrhea.
It is crucial to educate patients about factors that can alter lithium levels, such as illness (fever, vomiting, diarrhea), vigorous exercise, and the use of NSAIDs or diuretics.

How to Approach the Question

Identify the core of the question: It's asking for the most important piece of advice for a patient on lithium therapy.
Recall the key pharmacological properties of lithium: it is a mood stabilizer with a very narrow therapeutic index, and it is cleared by the kidneys.
Prioritize the major risks associated with the drug. For lithium, the most severe and common risk is toxicity.
Analyze the primary cause of toxicity. It is most often precipitated by dehydration and/or sodium depletion, which reduces renal clearance of the drug.
Evaluate the given options in the context of risk prioritization. 'Drink lots of water' directly addresses the main cause of toxicity.
Critically assess the other options: Taking with food is for comfort, not safety. Taking on an empty stomach is incorrect. A high-calorie diet is contraindicated. This confirms that hydration is the most critical advice.

Concept Tested & Keywords

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E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) pp. 2067-2069, 2068-2070, 2062-2064