Certified Emergency Nurse (CEN) Practice Test 2025 - Free CEN Practice Questions and Study Guide

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Which condition is characterized by dangerous hyperkalemia in renal failure?

Post-renal failure

Acute tubular necrosis

Stupor or coma

The condition characterized by dangerous hyperkalemia in renal failure is stupor or coma. In the context of renal failure, hyperkalemia, or elevated potassium levels in the blood, can lead to life-threatening complications, including neurocognitive changes. When potassium levels rise significantly, it can disturb the electrical conduction system of the heart, causing arrhythmias that can result in altered consciousness or even coma.

This response aligns with the physiological impact of hyperkalemia, where significant changes in potassium balance can lead to neurological symptoms, as the nervous system is sensitive to electrolyte imbalances. It is essential to monitor and manage potassium levels closely in patients with renal failure to prevent such severe outcomes.

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Hyponatremia

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