5. 一位62歲女性,長期服用amitriptyline治療憂鬱症(depression),最近因stroke住院。病人無吞嚥困難,飲食正常,也沒有水腫。住院一週後抽血檢查發現serum [Na] 126 mEq/L,osmolality 262 mOsm/kg。urine [Na] 40 mEq/L,urine osmolality 398 mOsm/kg。病人hyponatremia的原因,最可能是?
(A) 發生Renal sodium loss and dehydration
(B) 發生Extra-renal loss of sodium, and fluid overload
(C) 發生 lung cancer
(D) 發生 SIADH (syndrome of inappropriate anti-diuretic hormone secretion)
(E) 發生 stroke-induced central diabetes insipidus (DI)