Intraoperative fluid therapy in elderly under general anesthesia

Abstract

Three different fluids, were administered in over 70 years old patients operated under general anesthesia. Na concentration in the three different solution was 130mEq/l (H group), 77mEq/l (M group) and 15mEq/l (L group) and the amount of fluid infused was averaged 2500ml within 4 hours. No marked difference in water intake and output balance, was noted between the above groups. Serum Na concentration was decreased in the L and M group but not in the H. Na intake and output balance showed+170mM in the H group in this period which was mostly comparable with +100mM in the M group.
Negative balance in K intake and output was noted in the all groups. The above data indicates that elder patient may excrete water and Na sufficiently intraoperative period as well as younger suject does, and in addition suggestes that amount of K infused will be better increased to maintain serum K level normal.