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Difficulty: Very hardPharmacological Therapies

During morning rounds, a practical nurse reviews the electronic health record of a client diagnosed with bipolar disorder and hypertension. The client was admitted overnight for severe viral gastroenteritis with persistent vomiting and diarrhea. The morning laboratory results reveal a serum sodium level of 128 mEq/L128\text{ mEq/L} (128 mmol/L128\text{ mmol/L}). The client is scheduled to receive their routine oral lithium carbonate and oral hydrochlorothiazide in 30 minutes. Current vital signs indicate a heart rate of 115 beats/min115\text{ beats/min} and a blood pressure of 94/58 mm Hg94/58\text{ mm Hg}. Based on the client's clinical presentation, which action is the priority for the practical nurse?

  1. Withhold both medications and immediately notify the registered nurse of the client's laboratory results and vital signs.Answer
  2. B
    Calculate the client's estimated fluid deficit, initiate an intravenous infusion of normal saline, and withhold the scheduled medications.
  3. C
    Administer the lithium carbonate with food to prevent gastric irritation, but withhold the hydrochlorothiazide due to the low blood pressure.
  4. D
    Administer both medications as prescribed with a full glass of water to promote hydration, then recheck the client's vital signs in one hour.

Answer

Withhold both medications and immediately notify the registered nurse of the client's laboratory results and vital signs.
The correct action demonstrates a synthesis of pharmacological knowledge, interpretation of clinical data, and safe practice boundaries. The client's vital signs (tachycardia, hypotension) and history of severe gastrointestinal losses indicate significant fluid volume deficit. Furthermore, the serum sodium level is critically low (128 mEq/L128\text{ mEq/L}). Lithium clearance is directly tied to sodium balance; hyponatremia causes the kidneys to aggressively retain lithium, leading to acute, life-threatening toxicity. Hydrochlorothiazide is a potassium- and sodium-wasting diuretic that would further exacerbate both the hyponatremia and the hypovolemia, compounding the risk of lithium toxicity. The safest and most appropriate action within the practical nurse scope of practice is to withhold both dangerous medications and immediately escalate the critical findings to the registered nurse.

Step-by-Step Solution

1
Analyze the client's vital signs and clinical presentation.
The client has a history of severe vomiting and diarrhea, a heart rate of 115 beats/min, and a blood pressure of 94/58 mm Hg, indicating significant dehydration and potential hypovolemia.
Recognizing fluid volume deficit is essential before administering any medications that affect fluid balance or renal clearance.
2
Interpret the morning laboratory values.
The serum sodium level is critically low at 128 mEq/L (normal is 135-145 mEq/L).
Electrolyte imbalances directly impact the pharmacokinetics of certain medications, particularly lithium.
3
Evaluate the scheduled medications against the current clinical data.
Hydrochlorothiazide is a diuretic that will worsen the dehydration and hyponatremia. Lithium excretion is heavily dependent on sodium levels; hyponatremia causes the kidneys to reabsorb lithium, leading to rapid toxicity.
Administering either medication under these conditions is strictly contraindicated.
4
Determine the priority nursing action within the practical nurse scope of practice.
The nurse must withhold both medications and immediately escalate the critical findings to the registered nurse or healthcare provider.
The practical nurse has a duty to advocate for client safety by withholding unsafe medications and reporting critical changes in condition to the supervising RN.

Key Concept

Pharmacokinetics, Drug-Electrolyte Interactions, and Practical Nurse Scope of Practice
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Topics

Pharmacological Therapies

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