Objectives: This study aimed to examine nationwide trends in acute stroke endovascular thrombectomy (EVT) following five pivotal trials in 2015 that established it as the 'standard of care'.
Methods: The Japanese Registry of NeuroEndovascular Therapy 4 was a nationwide retrospective study registering consecutive patients who underwent neurointervention by specialists certified by the Japanese Society for Neuroendovascular Therapy at 166 centers from January 2015 to December 2019. We extracted patients who underwent EVT, and analyzed the annual trends in baseline characteristics, revascularization procedures and outcomes.
Results: A total of 13,090 patients (75.3 ± 12.2 years, 5637 women) were included. Analyses revealed an annual increase in patient age and treatments beyond 6 h after onset. However, there was an annual decline in premorbidly independent patients and those with large vessel occlusion. The frequency of stent-aspiration techniques and rate of successful reperfusions significantly increased from 19.9 % to 51.0 % and from 81.4 % to 83.9 %, respectively through the study period. Trends in patients achieving a favorable (modified Rankin Scale score of 0-2 at 30 days) or fatal outcome, or experiencing intracranial hemorrhagic complications remained unchanged. However, calendar time was associated with favorable outcomes after adjusting for clinical and treatment characteristics (odds ratio, 1.040; P = 0.015).
Conclusions: During the study period, EVT indications expanded for patients with characteristics linked to worse outcomes. However, factors such as advancements in techniques, have led to modest but significant improvements in reperfusion status, leading to maintenance of the post-EVT clinical outcomes.
Registration: URL: https://www.umin.ac.jp/ctr/; Unique identifier: UMIN000038869.
Keywords: Acute ischemic stroke; Endovascular therapy; Nationwide survey; Trend.
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