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Table 2 Characteristics of thrombectomy procedures and outcomes in the three years

From: Cumulative experience improves the procedures of mechanical thrombectomy

  Total (n = 222) 1st year (n = 50) 2nd year (n = 68) 3rd year (n = 104) P P (1st vs.2nd) P (2nd vs.3rd)
Door to groin puncture time (min) 122 (92–155) 152 (123–189) 119 (85–149) 106 (84–135) < 0.001 < 0.001 0.507
Puncture to first recanalization time (min) 66 (51–102) 70 (53–119) 68 (54–103) 60 (45–79) 0.033 0.063 0.079
Door to first recanalization time (min) 197 (163–240) 240 (185–280) 194 (165–227) 177 (145–218) < 0.001 < 0.001 0.111
Onset to first recanalization time (min) 340 (279–428) 357 (294–420) 352 (285–494) 311 (256–378) 0.005 0.073 0.005
Number of device passes 2 (1–3) 2 (1–4) 1 (1–2) 2 (1–3) 0.013 0.016 0.076
Additional interventionsa 37 (16.7%) 9 (18.0%) 14 (20.6%) 14 (13.5%) 0.367 0.727 0.217
First pass effect 36 (16.2%) 3 (6.0%) 12 (17.6%) 21 (20.2%) 0.035 0.062 0.679
mTICI score      < 0.001 0.002 0.736
 3 107 (48.2%) 15 (30.0%) 36 (52.9%) 56 (53.8%)    
 2b 74 (33.3%) 16 (32.0%) 23 (33.8%) 35 (33.7%)    
 2a 24 (10.8%) 11 (22.0%) 5 (7.4%) 8 (7.7%)    
 1 9 (4.1%) 3 (6.0%) 2 (2.9%) 4 (3.8%)    
 0 8 (3.6%) 5 (10.0%) 2 (2.9%) 1 (1.0%)    
Successful recanalization 181 (81.5%) 31 (62.0%) 59 (86.8%) 91 (87.5%) 0.001 0.002 0.888
mRS 0–2 at 90 days 85 (38.3%) 17 (34.0%) 25 (36.8%) 43 (41.3%) 0.357 0.758 0.549
Any ICHb 91 (41.4%) 25 (50.0%) 30 (44.8%) 36 (35.0%) 0.062 0.577 0.200
sICH b 18 (8.2%) 6 (12.0%) 6 (9.0%) 6 (5.8%) 0.183 0.593 0.438
Death at 90 days 43 (19.4%) 12 (24.0%) 12 (17.6%) 19 (18.3%) 0.462 0.399 0.918
  1. Abbreviations: mTICI modified thrombolysis in cerebral infarction, mRS modified Rankin scale, ICH intracranial hemorrhage, sICH symptomatic intracranial hemorrhage
  2. aAdditional interventions included aspiration, intra-arterial thrombolysis, balloon dilation, and stent implantation
  3. bAny ICH and sICH were assessed in 220 patients while 1 patient in the 2nd year and 1 patient in the 3rd year died before repeated imaging