2) effects on body ① slight thirst ② blood volume a dehydrated signs;BP↓ ③ urinary alteration urine specifIc urine volume gravity Na early ADH T stage ADS 1 late Adh i stage ADS tt 3)principles of treatment 补偏低渗液;先补0.9%NaCl2) effects on body ① slight thirst ② blood volume dehydrated signs; BP ③ urinary alteration urine specific urine volume gravity [Na+ ] ------------------------------------------------------------------ early ADH stage ADS late ADH stage ADS ------------------------------------------------------------------ 3) principles of treatment 补偏低渗液；先补0.9%NaCl