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A patient presents with altered mental status and decreased fluid intake. The patient is diagnosed with a urinary tract infection. Laboratory testing of electrolytes reveals sodium 167 mmol/L and potassium 4.0 mmol/L.

Which electrolyte imbalance is this patient experiencing?

Rationale

This patient is experiencing hypernatremia.

Hypernatremia is characterized by elevated sodium levels in the blood, which in this case is confirmed by the lab result of sodium at 167 mmol/L. This condition often arises due to inadequate fluid intake and can lead to altered mental status, as seen in the patient.

A (Hypokalemia) YOUR ANSWER

Hypokalemia refers to low potassium levels in the blood, typically defined as potassium levels below 3.5 mmol/L. In this patient, the potassium level is recorded at 4.0 mmol/L, which is within the normal range; therefore, hypokalemia is not applicable in this scenario.

B (Hyponatremia) YOUR ANSWER

Hyponatremia is a condition where sodium levels fall below 135 mmol/L. The patient’s sodium level of 167 mmol/L clearly indicates that this patient does not have hyponatremia, as their sodium is significantly elevated.

C (Hypernatremia) CORRECT

Hypernatremia is the correct diagnosis here, as it is defined by elevated sodium levels exceeding 145 mmol/L. The patient's sodium level of 167 mmol/L confirms this electrolyte imbalance, which can lead to neurological symptoms due to shifts in fluid balance.

D (Hyperkalemia) YOUR ANSWER

Hyperkalemia is characterized by elevated potassium levels, typically above 5.0 mmol/L. Since the patient's potassium level is 4.0 mmol/L, this condition does not apply, as the potassium is actually within the normal range.

Conclusion

The patient is diagnosed with hypernatremia due to the significantly high sodium level of 167 mmol/L, consistent with their presenting symptoms of altered mental status and decreased fluid intake. Understanding electrolyte imbalances like hypernatremia is crucial in managing patient care, particularly in cases involving urinary tract infections and resultant dehydration.

Which electrolyte imbalance is this patient experiencing?

This patient is experiencing hypernatremia.

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