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Comparison of simple and complicated obstruction
| Simple (n = 46) | Complicated (n = 27) | |
| Initial laparotomy site | ||
| Upper abdomen | 17 (37%) | 9 (33%) |
| Lower abdomen | 29 (63%) | 18 (67%) |
| Preoperative clinical findings | ||
| Rebound tenderness | 29 (63%) | 25 (93%) |
| Fever > 38°C | 0 (0%) | 18 (67%) |
| Tachycardia | 15 (33%) | 20 (74%) |
| Leukocytosis > 15000/cumm | 0 (0%) | 20 (74%) |
| ↑Hematocrit/↑BUN | 20 (43%) | 24 (89%) |
| ↑Serum amylase | 2 (4.3%) | 10 (37%) |
| ↑Alkaline phosphatase | 3 (6.5%) | 7 (26%) |
| Metabolic acidosis | 0 (0%) | 4 (15%) |
