二、 water and sodium disorders hypertonic ypertonIc dehydration isotonic water excess 3 isotonic hypotonic hypotonic ()细胞外液容量不足( extracellular fluid deficit) 1. Hypotonic dehydration sodium loss water loss serum sodium 130mmoVL plasma osmotic pressure 280m0sm/L二、water and sodium disorders hypertonic hypertonic dehydration isotonic water excess isotonic hypotonic hypotonic (一) 细胞外液容量不足(extracellular fluid deficit) 1. Hypotonic dehydration sodium loss ＞ water loss serum sodium ＜ 130mmol/L plasma osmotic pressure ＜ 280mOsm/L