Hypocalcemia in immediate post – op period following excision of parathyroid adenoma is due to ?
**Core Concept**
Hypocalcemia in the immediate post-operative period following excision of a parathyroid adenoma is primarily due to the sudden drop in parathyroid hormone (PTH) levels. This is a temporary condition that resolves once PTH levels normalize.
**Why the Correct Answer is Right**
During parathyroid adenoma excision, the surgeon aims to remove the abnormal parathyroid gland while preserving the normal parathyroid tissue. However, if the surgery is not performed carefully, the normal parathyroid glands may also be damaged or removed, leading to a sudden drop in PTH levels. PTH is crucial for maintaining normal calcium levels in the blood, and its deficiency results in hypocalcemia. The parathyroid glands regulate calcium levels by secreting PTH, which stimulates the release of calcium from bones, increases its absorption from the intestine, and promotes its reabsorption in the kidneys.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not address the immediate post-operative period following parathyroid adenoma excision. While hypocalcemia can occur due to vitamin D deficiency, it is not the primary cause in this specific scenario.
**Option B:** This option is incorrect because it refers to a condition that can cause hypocalcemia, but it is not the primary cause in the immediate post-operative period following parathyroid adenoma excision.
**Option D:** This option is incorrect because it does not address the specific scenario of parathyroid adenoma excision. While hypocalcemia can occur due to various reasons, it is not the primary cause in this specific scenario.
**Clinical Pearl / High-Yield Fact**
It is essential for surgeons to carefully preserve the normal parathyroid glands during parathyroid adenoma excision to prevent hypocalcemia. This can be achieved by using intraoperative parathyroid hormone (PTH) monitoring to assess the adequacy of parathyroid gland preservation.
**Correct Answer: C. Hypoparathyroidism**