AIIMS Delhi NO- 2019: What advice should a nurse give to a patient on lithium therapy?

AIIMS Delhi NO- 2019

Mental Health Nursing

Medium

Appeared in: AIIMS Delhi NO- 2019

Explanation

Lithium has a narrow therapeutic index (0.6-1.2 mEq/L), making toxicity a significant risk.
The kidneys excrete lithium, and its clearance is highly dependent on the patient's hydration and sodium status.
Dehydration causes the kidneys to reabsorb more lithium along with sodium and water, leading to elevated serum levels and potential toxicity.
Advising the patient to drink plenty of fluids (2-3 quarts or 2-3 liters daily) is the most critical intervention to maintain stable drug levels and prevent a medical emergency.

Option B: While taking lithium with food is recommended to reduce gastrointestinal upset, it addresses a comfort issue (nausea), not a life-threatening safety risk. Preventing toxicity is always the highest priority.
Option C: This advice is incorrect and would likely increase the incidence and severity of gastrointestinal side effects like nausea, vomiting, and diarrhea.
Option D: This advice is contraindicated. Weight gain is a common side effect of long-term lithium therapy. Recommending a high-calorie diet would exacerbate this issue.

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 core nursing responsibility, especially for high-risk medications like lithium. Nurses must ensure patients understand how to take their medication safely to prevent adverse events.
Nurses must teach patients to recognize and report early signs of lithium toxicity, such as coarse hand tremors, persistent nausea/vomiting, and confusion.
It is crucial to educate patients about situations that can cause fluid loss (e.g., illness with diarrhea/vomiting, strenuous exercise in heat) and to consult their doctor, as these can precipitate toxicity.

How to Approach the Question

First, identify the key subject of the question: patient advice for lithium therapy.
Recall the most critical safety information about lithium. Its narrow therapeutic index and risk of toxicity should come to mind first.
Analyze the physiological mechanism of lithium clearance. Remember that it's handled by the kidneys and is linked to sodium and water balance.
Evaluate each option based on a hierarchy of needs, prioritizing safety over comfort. Preventing life-threatening toxicity is more important than managing mild side effects.
Option A directly addresses the primary mechanism of toxicity (dehydration). Option B addresses a common side effect (GI upset). Options C and D are incorrect and potentially harmful.
Conclude that the advice to drink plenty of water is the most important because it directly mitigates the most severe risk associated with the drug.

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