A patient is demonstrating upon electrocardiogram a prolonged P-R interval and ST segment depression. The nurse realizes these changes are seen in which of the following electrolyte imbalances?
1. hypokalemia
2. hyperkalemia
3. hypernatremia
4. hypocalcemia
2
Rationale: Cardiovascular manifestations of hyperkalemia include prolonged P-R interval; flat or absent P wave; slurring of QRS; tall peaked T wave; and ST segment depression. These same electrocardiogram changes are not seen in hypokalemia, hypernatremia, or hypocalcemia.
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