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Table 1 Baseline characteristics of patients 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
Age (years) 70.9 ± 11.9 69.5 ± 11.4 70.8 ± 13.4 71.7 ± 11.2 0.557
Sex, male 144 (64.9%) 31 (62.0%) 45 (66.2%) 68 (65.4%) 0.728
Medical history
 Hypertension, n (%) 163 (73.4%) 36 (72.0%) 46 (67.6%)) 81 (77.9%)) 0.308
 Diabetes, n (%) 42 (18.9%) 5 (10.0%) 17 (25.0%) 20 (19.2%) 0.305
 Atrial fibrillation, n (%) 113 (50.9%) 26 (52.0%) 30 (44.1%) 57 (54.8%) 0.555
 Prior stroke, n (%) 42 (18.9%) 4 (8.0%) 13 (19.1%) 25 (24.0%) 0.021
Laboratory examination
 Platelet count, × 109/L 175 (142–225) 176 (142–251) 175 (142–220) 177 (144–215) 0.604
 INR, % 1.0 ± 0.1 1.0 ± 0.1 1.1 ± 0.2 1.0 ± 0.1 0.087
 Serum creatinine, μmol/L 74 (61–93) 77 (64–102) 77 (63–96) 69 (58–85) 0.036
 Glucose, mmol/L 6.5 (5.4–7.7) 6.3 (5.1–7.7) 6.8 (5.2–7.6) 6.5 (5.5–7.6) 0.511
Baseline SBP, mmHg 142 ± 21 145 ± 20 138 ± 23 144 ± 20 0.099
Baseline DBP, mmHg 87 ± 15 87 ± 12 84 ± 15 88 ± 15 0.212
Baseline NIHSS score 14 (11–19) 15 (12–18) 14 (9–18) 15 (11–20) 0.406
Infarct circulation      0.417
 Anterior, n (%) 180 (81.1%) 42 (80.0%) 56 (82.4%) 82 (78.8%)  
 Posterior, n (%) 42 (18.9%) 8 (16%) 12 (17.6%) 22 (21.2%)  
Stroke subtypes      0.955
 LAA 96 (43.2%) 22 (44.0%) 29 (42.6%) 45 (43.3%)  
 CE 108 (48.6%) 24 (48.0%) 33 (48.5%) 51 (49.0%)  
 SOE 2 (0.9%) 1 (2.0%) 1 (1.5%) 0 (0%)  
 SUE 16 (7.2%) 3 (6.0%) 5 (7.4%) 8 (7.7%)  
Onset to door time, min 132 (65–217) 91 (38–180) 145 (65–206) 149 (77–283) 0.009
recruited beyond 6 h, n (%) 21 (9.4%) 1 (2%) 2 (2.9%) 18 (7.3%) 0.001
Intravenous thrombolysis, n (%) 114 (51.4%) 28 (56.0%) 44 (64.7%) 42 (40.4%) 0.021
  1. Abbreviation: INR international normalized ratio, SBP systolic blood pressure, DBP diastolic blood pressure, NIHSS National Institutes of Health stroke scale, LAA large artery atherosclerosis, CE cardiac embolism, SOE stroke of other determined etiology, SUE stroke of undetermined etiology