Comparison of patients positive and negative for the swirl sign
| Patient Characteristics | Swirl Sign −ve (n = 121) | Swirl +ve (n = 91) | P Value |
|---|---|---|---|
| Age (median) (IQR) (yr) | 69 (51–76) | 68 (51–72) | .4 |
| Male sex (No.) (%) | 50 (41.3) | 36 (39.6) | .89 |
| Time to initial CT (median) (IQR) (hr) | 16.1 (1.1–95.3) | 8.0 (0.37–94) | <.001 |
| Time to second CT (median) (IQR) (hr) | 21.0 (10.3–28.5) | 16.5(5.9–29.5) | .12 |
| Initial hematoma volume (median) (IQR) (mL) | 8.56 (3.83–14.95) | 23.2 (11.65–43.3) | <.001 |
| PMHx (No.) (%) | |||
| Hypertension | 99 (81.8) | 67 (73.6) | .18 |
| Hypercholesterolemia | 45 (37.3) | 23 (25.3) | .08 |
| Statin use | 40 (33.1) | 28 (30.8) | .77 |
| Diabetes | 33 (27.5) | 21 (23.1) | .52 |
| Ischemic heart disease | 21 (17.4) | 18 (19.8) | .72 |
| Atrial fibrillation | 21 (17.4) | 26 (28.6) | .06 |
| Previous stroke | |||
| Transient ischemic attack | 9 (7.5) | 4 (4.4) | .40 |
| Ischemic stroke (n = 207) | 10 (8.5) | 11 (12.2) | .49 |
| Hemorrhagic stroke | 8 (6.8) | 4 (4.4) | .56 |
| Anticoagulant (No.) (%) | |||
| Warfarin | 19 (15.7) | 23 (25.3) | .12 |
| Antiplatelet | 42 (34.7) | 28 (30.8) | .56 |
| GCS on presentation (median) (IQR) (n = 207) | 14 (12–15) | 13 (11–14) | .018 |
| INR (median) (IQR) | 1.1 (1.0–1.2) | 1.1 (1.0–1.4) | .13 |
| Radiologic (No.) (%) | |||
| Location supratentorial | 95 (78.5) | 78 (85.7) | .21 |
| IV extension (n = 145) | 50 (63.3) | 38 (57.6) | 1.00 |
| Midline shift | 27 (22.3) | 51 (56.0) | <.001 |
Note:—INR indicates international normalized ratio; −ve, negative; +ve, positive; PMHx, past medical history; GCS, Glasgow Coma Scale; IV, intraventricular.