Table 2.
Perioperative clinical characteristics of 319 patients who underwent burr hole evacuation of CSDH and had postoperative imaging
| Total (n = 319) | No drain inserted* (n = 45) | Drain* (n = 272) | p value | |
|---|---|---|---|---|
| Preoperative platelet transfusion | 27 (8.5) | 2 (4.4) | 25 (9.2) | 0.29 |
| Preoperative vitamin K | 58 (18.2) | 5 (11.1) | 52 (19.1) | 0.20 |
| Preoperative FFP | 8 (2.5) | 0 (0) | 7 (2.6) | 0.28 |
| Preoperative GCS (median, IQR) | 14 (13–15) | 14 (13.5–15) | 0.63 | |
| GCS 3–8 | 17 (5.3) | 2 (4.4) | 15 (5.5) | |
| GCS 9–12 | 41 (12.9) | 6 (13.3) | 35 (12.9) | |
| GCS 13–15 | 261 (81.8) | 37 (82.2) | 222 (81.6) | |
| Preoperative mRS | 0.04 | |||
| mRS 0–3 | 183 (57.4) | 32 (71.1) | 149 (54.8) | |
| mRS 4–5 | 136 (42.6) | 13 (28.9) | 123 (45.2) | |
| CSDH laterality | 0.11 | |||
| Left | 121 (37.9) | 24 (53.3) | 97 (36.7) | |
| Right | 102 (32.0) | 11 (24.4) | 91 (34.5) | |
| Bilateral | 86 (27.0) | 10 (22.2) | 76 (28.8) | |
| Unknown/missing | 10 (3.1) | - | - | |
| Timing of operation | 0.20 | |||
| Within 2 days of referral | 223 (69.9) | 16 (36.4) | 72 (27.0) | |
| After 2 days of referral | 88 (27.6) | 28 (63.6) | 195 (73.0) | |
| Unknown/missing | 8 (2.5) | - | - | |
| Number of burr hole(s) | < 0.01 | |||
| Single burr hole | 22 (6.9) | 10 (22.2) | 12 (4.4) | |
| > 1 burr holes | 295 (92.5) | 35 (77.8) | 260 (95.6) | |
| Unknown/missing | 2 (0.6) | - | - | |
| Postoperative bed rest | 0.05 | |||
| No specific instructions | 119 (37.3) | 24 (53.3) | 95 (34.9) | |
| 1–12 h | 27 (8.5) | 6 (13.3) | 21 (7.7) | |
| 12–24 h | 118 (37.0) | 11 (24.4) | 107 (39.3) | |
| 24–48 h | 46 (14.4) | 4 (8.9) | 42 (15.4) | |
| 48+ hours | 7 (2.2) | 0 (0) | 7 (2.6) | |
| Unknown/missing | 2 (0.6) | - | - | |
| Postoperative imaging | 0.10 | |||
| Indication not specified | 2 (0.6) | |||
| Routine | 184 (57.7) | 21 (46.7) | 163 (59.9) | |
| Due to concerns | 133 (41.7) | 24 (53.3) | 109 (40.1) | |
*Two patients had missing data on drain insertion