② urinary alteration urine specific urine volume gravity Nat early ADH↓ 士or stage ADS t late ADh t stage ADS tt (注:经肾失訥的低渗性脱水,尿钠不藏少)② urinary alteration urine specific urine volume gravity [Na+ ] ---------------------------------------------------------- early ADH ± or stage ADS late ADH stage ADS ----------------------------------------------------------- (注：经肾失钠的低渗性脱水，尿钠不减少)