Which is not a feature of primary hyperaldosteronism:
**Core Concept**
Primary hyperaldosteronism is a condition characterized by excessive production of aldosterone, a hormone produced by the adrenal glands that regulates sodium and potassium levels in the body. The condition is often caused by a benign tumor in one adrenal gland (Conn's syndrome) or bilateral adrenal hyperplasia.
**Why the Correct Answer is Right**
Primary hyperaldosteronism is typically associated with hypertension, hypokalemia (low potassium levels), and metabolic alkalosis (elevated blood pH). The excessive aldosterone production leads to sodium retention, water retention, and potassium excretion. This results in hypertension due to the increased fluid volume and hypokalemia due to the potassium loss.
**Why Each Wrong Option is Incorrect**
**Option A:** Hypocalcemia (low calcium levels) is not typically a feature of primary hyperaldosteronism. Instead, patients often have hypercalcemia (elevated calcium levels) due to the increased calcium reabsorption in the kidneys.
**Option B:** Hypernatremia (elevated sodium levels) is a characteristic feature of primary hyperaldosteronism, resulting from the excessive sodium retention caused by aldosterone.
**Option C:** Metabolic acidosis (decreased blood pH) is not typically associated with primary hyperaldosteronism, as the condition is more commonly associated with metabolic alkalosis.
**Clinical Pearl / High-Yield Fact**
When evaluating a patient with hypertension, it's essential to consider the possibility of primary hyperaldosteronism, especially in cases with hypokalemia and metabolic alkalosis. A low plasma renin activity and high aldosterone level can help confirm the diagnosis.
**Correct Answer:** C. Metabolic acidosis.