Table 2.
Trends in intra-arterial treatment by year, 2008–2018
| 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | P for trend | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall IAT among AIS patients, n (%) | 225 (1.0) | 347 (1.2) | 490 (1.4) | 698 (1.7) | 843 (2.1) | 1012 (1.7) | 1358 (2.0) | 2358 (3.5) | 2270 (3.2) | 3189 (3.9) | 5195 (5.3) | <0.001 | |
| Method of IAT delivery, n (%) | |||||||||||||
| IAT only | 178 (79.1) | 272 (78.4) | 366 (74.7) | 538 (77.1) | 624 (74.0) | 723 (71.4) | 1002 (73.8) | 1711 (72.6) | 1689 (74.4) | 2321 (72.8) | 3966 (76.3) | 0.82 | |
| IVT+IAT | 47 (20.9) | 75 (21.6) | 124 (25.3) | 160 (22.9) | 219 (26.0) | 289 (28.6) | 356 (26.2) | 647 (27.4) | 581 (25.6) | 868 (27.2) | 1229 (23.7) | 0.82 | |
| Hospital level results | |||||||||||||
| No of hospitals providing IAT | 32 | 38 | 45 | 49 | 62 | 77 | 86 | 92 | 56 | 75 | 90 | ||
| Distribution of hospitals by IAT volume, n (%) | |||||||||||||
| <15 | 29 (90.6) | 33 (86.8) | 34 (75.6) | 33 (67.3) | 45 (72.6) | 59 (76.6) | 58 (67.4) | 41 (44.6) | 22 (39.3) | 30 (40.0) | 20 (22.2) | <0.001 | |
| 15–30 | 1 (3.1) | 2 (5.3) | 9 (20.0) | 12 (24.5) | 12 (19.4) | 12 (15.6) | 19 (22.1) | 28 (30.4) | 8 (14.3) | 12 (16.0) | 15 (16.7) | 0.007 | |
| >30 | 2 (6.3) | 3 (7.9) | 2 (4.4) | 4 (8.2) | 5 (8.1) | 6 (7.8) | 9 (10.5) | 23 (25.0) | 26 (46.4) | 33 (44.0) | 55 (61.1) | <0.001 | |
| Median (IQR) procedure per hospital | 4 (2–11) | 5.5 (2–11) | 7 (4–12) | 8 (3–17) | 6.5 (3–15) | 7 (2–14) | 8 (4–20) | 18 (7–31) | 27.5 (7–47) | 24 (6–47) | 43 (17–66) | <0.001 | |
p value for trend was based on Cochran-armitage test.
AIS, acute ischemic stroke; IAT, intra-arterial treatment; IVT, intravenous thrombolysis.