Variables |  | Anion gap < 12 mEq/L (N = 151) | Anion gap between 12–16 mEq/L (N = 200) | Anion gap > 16 m Eq/L (N = 54) | P value |
---|---|---|---|---|---|
General condition | |||||
 | Admission type |  |  |  |  < 0.001 |
 | ELECTIVE | 121 (80.1%) | 153 (76.5%) | 16 (29.6%) |  |
 | EMERGENCY | 27 (17.9%) | 42 (21.0%) | 37 (68.5%) |  |
 | URGENT | 3 (2.0%) | 5 (2.5%) | 1 (1.9%) |  |
 | Death in ICU | 1 (0.7%) | 8 (4.0%) | 19 (35.2%) |  < 0.001 |
 | Death in hospital | 2 (1.3%) | 8 (4.0%) | 20 (37.0%) |  < 0.001 |
 | Death within 90 days | 4 (2.6%) | 11 (5.5%) | 21 (38.9%) |  < 0.001 |
 | Death within 365 days | 6 (4.0%) | 15 (7.5%) | 27 (50.0%) |  < 0.001 |
 | LOS in hospital (days) | 7.36 [6.12, 11.01] | 9.24 [6.27, 16.87] | 13.52 [9.26, 21.77] |  < 0.001 |
 | LOS in ICU (days,) | 2.25 [1.33, 3.98] | 3.39 [2.01, 9.18] | 8.95 [3.01, 20.01] |  < 0.001 |
 | Type of aortic aneurysm |  |  |  |  < 0.001 |
 | Abdominal aneurysm without mention of rupture | 34 (22.5%) | 63 (31.5%) | 12 (22.2%) |  |
 | Abdominal aneurysm, ruptured | 2 (1.3%) | 12 (6.0%) | 21 (38.9%) |  |
 | Thoracic aneurysm without mention of rupture | 105 (69.5%) | 109 (54.5%) | 7 (13.0%) |  |
 | Thoracic aneurysm, ruptured | 1 (0.7%) | 1 (0.5%) | 4 (7.4%) |  |
 | Thoracoabdominal aneurysm, ruptured | 2 (1.3%) | 2 (1.0%) | 3 (5.6%) |  |
 | Thoracoabdominal aneurysm, without mention of rupture | 7 (4.6%) | 13 (6.5%) | 7 (13.0%) |  |
 | Age (years) | 64.04 [56.20, 73.00] | 70.35 [60.43, 76.72] | 73.06 [69.39, 79.86] |  < 0.001 |
 | Male | 95 (62.9%) | 140 (70.0%) | 26 (48.1%) | 0.011 |
 | Aortic rupture | 5 (3.3%) | 15 (7.5%) | 28 (51.9%) |  < 0.001 |
Comorbidity | |||||
 | Sepsis | 2 (1.3%) | 4 (2.0%) | 6 (11.1%) | 0.001 |
 | Chronic pulmonary diseases | 31 (20.5%) | 48 (24.0%) | 9 (16.7%) | 0.461 |
 | Peripheral vascular diseases | 90 (59.6%) | 99 (49.5%) | 18 (33.3%) | 0.003 |
 | hypertension | 7 (4.6%) | 13 (6.5%) | 5 (9.3%) | 0.463 |
 | Renal failure | 7 (4.6%) | 17 (8.5%) | 7 (13.0%) | 0.116 |
 | Coagulopathy | 19 (12.6%) | 35 (17.5%) | 23 (42.6%) |  < 0.001 |
 | Fluid and electrolyte disorders | 29 (19.2%) | 43 (21.5%) | 17 (31.5%) | 0.17 |
Laboratory indicators on admission | |||||
 | Anion gap (mEq/L) | 10.00 [9.00, 11.00] | 13.00 [12.00, 14.00] | 19.00 [17.00, 22.00] |  < 0.001 |
 | Bicarbonate (mEq/L) | 24.00 [22.00, 25.00] | 23.00 [20.75, 24.00] | 18.00 [16.00, 21.75] |  < 0.001 |
 | Creatinine (mg/dL) | 0.80 [0.70, 1.10] | 1.00 [0.80, 1.33] | 1.50 [1.12, 2.08] |  < 0.001 |
 | Blood urea nitrogen (mg/dL) | 15.00 [13.00, 18.00] | 18.00 [14.00, 23.25] | 24.00 [18.00, 28.00] |  < 0.001 |
 | Hematocrit (%) | 24.60 [21.10, 27.00] | 25.00 [21.48, 29.00] | 25.60 [21.00, 27.60] | 0.613 |
 | Hemoglobin (g/dL) | 8.40 [7.50, 9.65] | 8.50 [7.30, 9.90] | 8.50 [7.10, 9.57] | 0.69 |
 | PTT (sec) | 40.70 [35.95, 50.80] | 41.25 [33.45, 50.05] | 62.05 [39.00, 130.43] |  < 0.001 |
 | PT (sec) | 15.90 [14.85, 17.30] | 15.50 [14.30, 17.12] | 17.00 [14.83, 19.67] | 0.007 |
 | INR | 1.50 [1.30, 1.70] | 1.40 [1.30, 1.70] | 1.80 [1.33, 2.30] | 0.001 |
 | white blood cell count (K/μL) | 12.70 [9.90, 15.30] | 12.60 [10.20, 16.00] | 12.00 [9.43, 16.18] | 0.817 |
 | Platelet count (K/μL) | 124.00 [97.00, 151.50] | 125.00 [89.00, 157.00] | 93.50 [58.25, 141.75] | 0.001 |
Treatment | |||||
 | Extracorporeal circulation | 120 (79.5%) | 115 (57.5%) | 15 (27.8%) |  < 0.001 |
 | Bypass surgery | 6 (4.0%) | 7 (3.5%) | 3 (5.6%) | 0.789 |
 | Ventilation in first day | 147 (97.4%) | 186 (93.0%) | 49 (90.7%) | 0.104 |
 | Urine output in first day (ml) | 2205.00 [1723.50, 3217.00] | 1982.50 [1268.50, 3012.50] | 1006.50 [489.50, 1968.50] |  < 0.001 |
Severity scores | |||||
 | GCS | 15.00 [14.00, 15.00] | 15.00 [14.75, 15.00] | 15.00 [15.00, 15.00] | 0.115 |
 | SOFA | 5.00 [3.00, 7.00] | 5.00 [4.00, 8.00] | 8.00 [5.25, 10.00] |  < 0.001 |
 | SAPSII | 31.00 [26.00, 38.50] | 32.50 [27.00, 42.00] | 46.50 [40.00, 58.50] |  < 0.001 |