Patient and procedural characteristics in the entire cohort
| Variables | Total | Technique at the second attempt | P value | |
| n=2167 | Alternative, n=434 | Same, n=1733 | ||
| Patient characteristics | ||||
| Age (years), median (IQR) | 71.0 (60.0–81.0) | 71.0 (61.0–80.5) | 71.0 (60.0–81.0) | 0.98 |
| Female sex | 1058 (48.8) | 203 (46.8) | 855 (49.3) | 0.32 |
| Hypertension | 1569 (72.4) | 313 (72.1) | 1256 (72.5) | 0.88 |
| Diabetes mellitus | 581 (26.8) | 124 (28.6) | 457 (26.4) | 0.35 |
| Atrial fibrillation | 789 (36.4) | 152 (35.0) | 637 (36.8) | 0.50 |
| Pre-stroke modified Rankin Scale score | 0 (0–1) | 0 (0–1) | 0 (0–1) | 0.95 |
| Admission NIHSS score, median (IQR) | 16 (12–21) | 16 (11–20) | 17 (12–21) | 0.11 |
| ASPECTS, median (IQR) | 8 (7–9) | 8 (7–9) | 8 (7–9) | 0.66 |
| Occluded vessel | <0.001 | |||
| Internal carotid artery | 461 (21.3) | 85 (19.6) | 376 (21.7) | |
| M1 of the middle cerebral artery | 1393 (64.3) | 252 (58.1) | 1141 (65.8) | |
| Internal carotid artery and M1 | 313 (14.4) | 97 (22.4) | 216 (12.5) | |
| Intra-venous thrombolysis | 933 (43.4); n=2148 | 171 (39.5); n=433 | 762 (44.4); n=1715 | 0.06 |
| Procedural characteristics | ||||
| First pass technique | <0.001 | |||
| Aspiration | 788 (37) | 225 (53) | 563 (33) | |
| Stent retriever | 502 (24) | 118 (28) | 384 (22) | |
| Combined approach | 843 (40) | 80 (19) | 763 (45) | |
| Onset to arterial puncture time (min), median (IQR) | 274 (176–513) | 301 (179–592) | 268 (175–498) | 0.05 |
| Total attempt number, median (IQR) | 3 (2–3) | 2 (2–3) | 3 (2–3) | 0.001 |
| Procedure time (min), median (IQR) | 47 (29–73) | 45 (28–76) | 47 (29–73) | 0.86 |
Data expressed as the number of cases (%), unless otherwise indicated.
ASPECTS, Alberta Stroke Program Early Computed Tomography Score; IQR, interquartile range; NIHSS, National Institutes of Health Stroke Scale.