一位診斷為抗利尿激素分泌不當症候群（SIADH）的病人，下列何種發現最令護理師擔憂？
A client diagnosed with SIADH (Syndrome of Inappropriate Antidiuretic Hormone) is being monitored. Which finding is most concerning to the nurse?
- ADecreased urine output尿量減少
- BSerum sodium 118 mEq/L✓ 正解血清鈉 118 mEq/L
- CWeight gain of 1 kg in 24 hours24 小時內體重增加 1 kg
- DBlood pressure 140/90 mmHg血壓 140/90 mmHg
抗利尿激素分泌不當症候群（SIADH）會導致體內水分過度滯留，進而稀釋血液中的鈉離子，造成稀釋性低血鈉。當血鈉降至 120 mEq/L 以下時，個案極易出現神經學症狀，如頭痛、混亂、癲癇發作或昏迷，這是極為危險的狀態。雖然 SIADH 會導致尿量減少與體重增加，但血鈉 118 mEq/L 屬於嚴重低血鈉，是目前所有選項中威脅生命安全的最關鍵指標。
Syndrome of inappropriate antidiuretic hormone (SIADH) causes excessive water retention, which dilutes serum sodium and leads to dilutional hyponatremia. When the serum sodium drops below 120 mEq/L, the client is at high risk for neurologic symptoms such as headache, confusion, seizures, or coma, an extremely dangerous state. Although SIADH also produces decreased urine output and weight gain, a serum sodium of 118 mEq/L represents severe hyponatremia and is the most life-threatening finding among the options provided.