Overview of baseline characteristics with group comparison of patients with and without successful first-pass effects
| Baseline characteristics | All patients (n=43) | ENI (n=23) | No ENI (n=16) | P value |
| Median age, years (IQR) | 78 (70–83) | 78 (70–84) | 76 (63–83) | 0.407 |
| Sex, women, % (n) | 32.6 (14/43) | 34.8 (8/23) | 25 (4/16) | 0.726 |
| Cardiovascular risk factors, % (n) | ||||
| Hypertension | 72.1 (31/43) | 78.3 (18/23) | 25 (4/16) | 1.0 |
| Atrial fibrillation | 41.9 (18/43) | 52.2 (12/23) | 31.1 (5/16) | 0.325 |
| Diabetes mellitus | 27.9 (12/43) | 30.4 (7/23) | 25 (4/16) | 1.0 |
| Hyperlipidemia | 14 (6/43) | 8.7 (2/23) | 25 (4/16) | 0.205 |
| Median admission NIHSS (IQR) | 7 (4–10) | 6 (4–13) | 8 (6–9) | 0.315 |
| Occluded PCA segment, % (n) | ||||
| P1 | 55.8 (24/43) | 52.2 (12/23) | 68.7 (11/16) | |
| Bilateral P1 | 9.3 (4/43) | 17.4 (4/23) | – | |
| P2 | 37.2 (16/43) | 39.1 (9/23) | 31.3 (5/16) | |
| Bilateral P2 | 2.3 (1/43) | – | 6.2 (1/16) | |
| P3 | 7 (3/43) | 8.7 (2/23) | ||
| Intravenous thrombolysis, % (n) | 55.8 (24/43) | 52.2 (12/23) | 62.5 (10/16) | 0.743 |
| Primary choice of device, % (n) | ||||
| Stent retriever | 88.4 (38/43) | 91.3 (21/23) | 81.3 (13/16) | 0.631 |
| Aspiration catheter | 11.6 (5/43) | 8.7 (2/23) | 18.7 (3/16) | |
| Median time from onset to groin puncture, min (IQR) | 181 (151–267) | 191 (150–341) | 229 (150–256) | 0.639 |
ENI, early neurological improvement; NIHSS, National Institutes of Health Stroke Scale; PCA, posterior cerebral artery.