A patient taking lithium for bipolar disorder develops new muscle weakness, coarse tremor, nausea, and drowsi… - NORCET 9 Prelims-2025

NORCET 9 Prelims-2025

Mental Health Nursing

Medium

Appeared in: NORCET 9 Prelims-2025

Explanation

The patient's symptoms (muscle weakness, coarse tremor, nausea, drowsiness) are hallmark signs of lithium toxicity.
The priority nursing action when drug toxicity is suspected is always to assess and confirm the diagnosis.
Obtaining a serum lithium level is the most direct and crucial assessment to determine the severity of the toxicity and guide further treatment.
All other interventions depend on the confirmation and level of toxicity; therefore, assessment is the first and most critical step.

Option A: Continuing the lithium dose is contraindicated as it would directly increase the drug level in the blood, worsening the toxicity and potentially leading to severe complications or death.
Option C: This action incorrectly addresses a symptom (tremor) as if it were caused by anxiety, rather than recognizing it as a neurological sign of drug toxicity. It fails to address the underlying life-threatening problem.
Option D: Restricting sodium is dangerous. The kidneys treat sodium and lithium similarly. When sodium intake is low, the kidneys reabsorb more sodium and, consequently, more lithium, leading to increased serum lithium levels and worsening toxicity.

Visual 1: Chart: A visual chart comparing the therapeutic range of lithium (0.6-1.2 mEq/L) with the different levels of toxicity (mild, moderate, severe) and their corresponding clinical manifestations. This helps in quickly associating symptoms with severity.

Clinical Relevance

Nursing practice connection: Safe nursing care depends on performing The concept tested is the nurse's ability to recognize the signs and symptoms of lithium toxicity and identify the priority nursing action in the correct sequence, documenting the action clearly, and monitoring for the expected response.
Early recognition of lithium toxicity is a critical patient safety responsibility for nurses. A coarse tremor is a major red flag that must be distinguished from the common fine tremor side effect.
Patient education is paramount. Nurses must teach patients on lithium to maintain consistent fluid (2-3 L/day) and salt intake, and to immediately report symptoms like vomiting, diarrhea, or excessive sweating, as these can lead to dehydration and toxicity.
What if? If the patient had only a fine hand tremor and mild thirst, the nurse's action would be different. The nurse would document the findings, educate the patient that these are common side effects, and continue to monitor, as these do not typically indicate toxicity requiring immediate cessation of the drug.

How to Approach the Question

First, analyze the patient's clinical presentation. Identify the key symptoms: muscle weakness, coarse tremor, nausea, and drowsiness.
Recognize that this is a clinical scenario question asking for the 'priority' action. This means you must choose the most important first step.
Connect the patient's medication (lithium) with the presented symptoms. Recall that these are classic signs of lithium toxicity.
Apply the nursing process: Assessment, Diagnosis, Planning, Implementation, Evaluation (ADPIE). The first step in managing a suspected problem is always assessment.
Evaluate the options based on the assessment-first principle. Assessing the serum lithium level is the only assessment option. The other options are implementations.
Eliminate the incorrect implementation options: Continuing the dose is harmful, treating the tremor symptomatically is incorrect, and restricting sodium is dangerous and worsens toxicity.

Concept Tested & Keywords

Concept Tested: The concept tested is the nurse's ability to recognize the signs and symptoms of lithium toxicity and identify the priority nursing action.
Stem keywords: lithium, bipolar disorder, muscle weakness, coarse tremor, nausea, drowsiness
Lead-in keywords: priority action
Clinical cues: The presence of a 'coarse' tremor is a key clinical cue that distinguishes toxicity from a common, benign side effect (fine tremor).

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