Evaluation of pure subarachnoid hemorrhage after mechanical thrombectomy in a series of 781 consecutive patients.

IntroductionSubarachnoid hyperdensity is commonly seen on postoperative computed tomography scans within 24 h after mechanical thrombectomy. The impact on patients' outcomes remains uncertain. We present a real-world experience evaluating periprocedural factors associated with the development of subarachnoid hemorrhage (SAH) and its impact on outcomes of patients with acute stroke undergoing mechanical thrombectomy.MethodsA single-center, retrospective analysis was performed between January 2016 and August 2021, including all consecutive patients who underwent thrombectomy. Our study aimed to evaluate periprocedural factors associated with subarachnoid hemorrhage within 24 h of the intervention, and the potential impact on patients' outcome.ResultsOf 781 patients, 44 patients (5.63%) demonstrated pure SAH within 24 h of the intervention. Patients from the SAH group were more likely to have tandem occlusion (15.9% vs. 5.2%,  = .003), aspiration using reperfusion pump system (81.4% vs. 66.8%,  = .047), intraoperative complications (9.1% vs. 0.9%;  < .001), longer puncture-to-recanalization times (45 min vs 29 min,  = .042) and a higher median number of passes to achieve recanalization (1 vs. 3,  = .002). There was no statistically significant difference in the long-term functional outcome between the groups.ConclusionWe suggest that dual-energy computed tomography could better distinguish between blood and pure contrast stagnation. Still, SAH was not associated with an unfavorable outcome in stroke patients undergoing thrombectomy.