Table 3.
Physiological characteristics of patients in a study testing the safety and efficacy of oral rehydration therapy until 2 h before surgery
| Characteristica | ORS group | Fasting group | P b |
|---|---|---|---|
| Blood urea nitrogen/serum creatinine ratio, mean (SD) | 17.9 (4.9) | 19.7 (5.2) | <0.01 |
| Hematocrit, mean (SD) (%) | 40.2 (4.9) | 40.4 (5.0) | NS |
| Serum total protein, mean (SD) (g dl−1) | 7.0 (0.6) | 7.0 (0.7) | NS |
| Serum albumin, mean (SD) (g dl−1) | 4.2 (0.5) | 4.1 (0.5) | NS |
| Serum sodium, mean (SD) (mEq l−1) | 140.5 (1.8) | 140.5 (1.9) | NS |
| Serum potassium, mean (SD) (mEq l−1) | 4.1 (0.3) | 4.1 (0.3) | NS |
| Serum chloride, mean (SD) (mEq l−1) | 105.6 (1.8) | 105.6 (2.1) | NS |
| Urine volume, mean (SD) (ml kg−1) | |||
| Between night before surgery and start of surgery | 15.3 (8.2) | 10.6 (5.4) | <0.001 |
| Between start of surgery and 1 h later | 2.1 (2.3) | 1.4 (1.8) | <0.01 |
| Between 1 and 2 h later | 3.2 (3.8) | 2.8 (3.7) | NS |
| Between 2 and 3 h later | 3.7 (4.3) | 2.8 (3.6) | NS |
| Between 3 and 4 h later | 3.1 (4.6) | 2.4 (2.0) | NS |
| Dose of vasopressor during surgery | |||
| Ephedrine hydrochloride, mean (SD) (mg) | 12.5 (9.5) | 11.0 (8.6) | NS |
| Phenylephrine hydrochloride, mean (SD) (mg) | 0.3 (0.3) | 0.4 (0.2) | NS |
| Volume of fluid during surgery | |||
| Crystalloid solution, mean (SD) (ml kg−1 h−1) | 9.0 (3.6) | 8.9 (3.6) | NS |
| Colloid solution, mean (SD) (ml kg−1 h−1) | 0.8 (1.5) | 0.8 (1.5) | NS |
aMeasurements taken immediately before anesthesia induction unless otherwise indicated
bUnpaired t test, α = 0.05