抄録
Water, electrolytes, and nitrogen balances were studied in 20 postoperative newborn infants who received 10% glucose solution (80 mls/kg/day) with sodium and chloride (3.5 mEq/kg/day), postassium (1.5 mEq/kg/day) and crystalline amino acid (1 g/kg/day). The urine volume exceeded 60 mls/kg/day from the day of operation. There was a correlation between the volume of given water (X) and water balance (Y) : Y=0.811X-45.8 for the first 3 days and Y=0.267X+0.601 for the third and fifth days after operation. Urinary excretion of sodium and chloride is slightly depressed for the first 3 postoperative days. There was also a correlation between sodium (or chloride) intake and sodium (or chloride) balance : Y (sodium balance)=0.846X (sodium intake)-1.53 for the first 3 days after the operation, and Y=0.868X-2.78 for the third and fifth postoperative days. High urinary excretion of potassium was noted for the first 3 days after operation. Urinary excretion of potassium, however, decreased gradually during the third to fifth postoperative day. There was a correlation between potassium intake (X) and potassium balance (Y) : Y=0.866X-0.797 for the first 3 days after operation and Y=0.825X-0.332 for the third and fifth post-operative days. Positive nitrogen balance was observed in 51 of 100 examinations. This positive nitrogen balance was accompanid by positive patassium balance in most cases. Serum electrolytes, blood sugar, serum and urine osmotic pressures were all within normal limits.
