Table 4 Univariate analysis of factors for postoperative AIH
Variables | AIH | No AIH | P Value |
|---|---|---|---|
Patients | 23(%) | 425(%) | Â |
Gender | 0.113 | ||
 Male | 15 (65.2) | 339 (79.8) |  |
 Female | 8 (34.8) | 86 (20.2) |  |
Age (years) | 0.908 | ||
  < 70 | 12 (52.2) | 227 (53.4) |  |
  ≥ 70 | 11 (47.8) | 198 (46.6) |  |
Head trauma event | 14 (60.9) | 281 (66.1) | 0.605 |
Medical history | |||
 Hypertension | 12 (52.2) | 160 (37.6) | 0.163 |
 Diabetes | 2 (8.7) | 57 (13.4) | 0.754 |
 Heart disease | 1 (4.3) | 46 (10.8) | 0.494 |
 Cerebral infarction | 1 (4.3) | 27 (6.4) | 1.00 |
 Renal failure dialysis | 0 (0) | 3 (0.7) | – |
Antiplatelet or anticoagulant drugs | |||
 Antiplatelet drugs | 3 (13.0) | 29 (6.8) | 0.221 |
 Anticoagulant drugs | 1 (4.3) | 14 (3.3) | 0.552 |
Preoperative clinical symptoms | |||
 Headache | 15 (65.2) | 187 (44.0) | 0.046 |
 Dizziness | 0 (0) | 139 (32.7) | – |
 Motor weakness | 14 (60.9) | 239 (56.2) | 0.662 |
 Nausea/vomiting | 2 (8.7) | 29 (6.9) | 0.668 |
 Speech impairment | 0 (0) | 17 (4.0) | – |
 Unsteady gait | 1 (4.3) | 7 (1.6) | 0.346 |
 Incontinence | 0 (0) | 11 (2.6) | – |
 Memory decline | 0 (0) | 14 (3.3) | – |
GCS at admission | 0.756 | ||
 15 | 21 (91.3) | 364 (85.6) |  |
 3–14 | 2 (8.7) | 61 (14.4) |  |
Operation side | 0.683 | ||
 Unilateral hematoma | 16 (69.6) | 278 (65.4) |  |
 Bilateral hematoma | 7 (30.4) | 147 (34.6) |  |
Radiological characteristics | |||
 Midline shift | 0.367 | ||
   < 10 mm | 17 (73.9) | 275 (64.7) |  |
   ≥ 10 mm | 6 (26.1) | 150 (35.3) |  |
 Preoperative maximal thickness | 0.043 | ||
   < 20 mm | 9 (39.1) | 90 (21.2) |  |
   ≥ 20 mm | 14 (60.9) | 335 (78.8) |  |
 Hematoma density | 0.924 | ||
  Hyper-dense | 7 (30.4) | 126 (29.6) |  |
  Hypo-dense | 4 (17.4) | 67 (15.8) |  |
  Mixed density | 10 (43.5) | 200 (47.1) |  |
  Iso-dense | 2 (8.7) | 32 (7.5) |  |
Treatment | |||
 Atorvastatin perioperatively | 9 (39.1) | 162 (38.1) | 0.922 |
 Anesthesia | 0.249 | ||
  Local | 13 (56.5) | 188 (44.2) |  |
  General | 10 (43.5) | 237 (55.8) |  |
  Intraoperative irrigation | 15 (65.2) | 361 (84.9) | 0.020 |
  Injection urokinase after operation | 0 (0) | 12 (2.8) | – |
 Duration of drainage, day | 0.307 | ||
  1 | 1 (4.3) | 62 (14.6) |  |
  2 | 19 (82.7) | 287 (67.5) |  |
   ≥ 3 | 3 (13.0) | 76 (17.9) |  |