Approaches to and outcomes of intra-arterial tPA in embolectomy for large vessel occlusion.

ABSTRACT

INTRODUCTION: Intra-arterial tissue plasminogen activator (IA tPA) is sometimes used in conjunction with aspiration catheters and stentrievers to achieve recanalization in endovascular thrombectomy (ET) for large vessel occlusion (LVO). Reports of safety and efficacy of this approach are limited by technical heterogeneity and sample size. METHODS: We retrospectively reviewed a data set of patients undergoing ET for LVO between August 2017 and September 2020 to identify those that received IA tPA. IA tPA usage, timing and dosage was at the discretion of the operative neurosurgeon. We identified three broad categories of IA tPA administration (1) adjunctive with the first pass; (2) salvage with subsequent passes after first pass achieved incomplete revascularization; and (3) post-thrombectomy residual distal occlusions. Univariate and multivariate logistic regression were performed to test associations with recanalization, hemorrhage, and functional independence. RESULTS: Among 271 patients, 158 (58%) patients had IA tPA, of which 83 received adjuvant IA tPA, 60 received salvage IA tPA, and 15 received post-thrombectomy IA tPA for distal occlusions. There were no differences in demographics, stroke etiology and premorbid medications between these groups. Patients receiving salvage IA tPA had longer times from groin access to recanalization and more passes, as expected. On multivariate analysis neither adjunctive nor salvage IA tPA was significantly associated with recanalization, post-operative hemorrhage, or functional outcomes. On univariate analysis, patients receiving salvage IA tPA had lower rates of TICI 3 or 2b revascularization (80% vs. 89% adjunctive and 92% no IA tPA, p =  0.003) and higher rates of any postoperative hemorrhage (33% vs. 22% adjunctive and 19% no IA tPA, p =  0.003). CONCLUSIONS: In this retrospective, single-institution series, IA tPA used adjunctively or as salvage therapy in ET for LVO was not associated with recanalization, post-operative hemorrhage, or functional outcomes, suggesting IA tPA is an available modality that can be utilized in cases of recalcitrant clots.