甲狀腺切除術後 24 小時，護理師測量血壓時發現手部痙攣（Trousseau's sign 陽性）。應預期哪項檢驗數據異常？
A client is 24 hours post-thyroidectomy. The nurse notes carpal spasms when taking blood pressure. Which laboratory finding should the nurse anticipate?
- ADecreased serum magnesium血清鎂降低
- BIncreased serum potassium血清鉀升高
- CIncreased serum phosphorus血清磷升高
- DDecreased serum calcium✓ 正解血清鈣降低
甲狀腺切除術後，若術中誤傷或移除了副甲狀腺（parathyroid glands），會導致副甲狀腺素（PTH）分泌不足。PTH 的主要功能是調節血鈣，其不足會引起低血鈣（hypocalcemia）。低血鈣會增加神經肌肉的興奮性，臨床上可透過 Trousseau's sign（測量血壓時手部出現抽搐）或 Chvostek's sign（敲擊臉部神經引發肌肉收縮）來檢測。這是一種需要立即處理的電解質失衡，嚴重時可能引發喉頭痙攣（laryngeal stridor）導致呼吸窘迫。
After thyroidectomy, inadvertent injury or removal of the parathyroid glands during surgery can result in insufficient secretion of parathyroid hormone (PTH). The primary function of PTH is to regulate serum calcium, and its deficiency causes hypocalcemia. Low serum calcium increases neuromuscular excitability and can be detected clinically through Trousseau's sign (carpal spasm when blood pressure is measured) or Chvostek's sign (facial muscle contraction with tapping of the facial nerve). This electrolyte imbalance requires immediate treatment, as severe cases may precipitate laryngospasm (laryngeal stridor) and respiratory distress.