title: Postinterventional subarachnoid haemorrhage after endovascular stroke treatment with stent retrievers.
abstract: BACKGROUND
  The purpose of this paper is to investigate the clinical significance of postinterventional subarachnoid hyperdensities (PSH) after endovascular mechanical thrombectomy in acute ischemic stroke.
  
  
  METHODS
  We analysed clinical and radiological data of 113 consecutive patients who received postinterventional CT scans within 4.5 h after mechanical thrombectomy.
  
  
  RESULTS
  PSH was present in 27 of 113 patients (24%). Extravasation of contrast agent was observed during intervention in only 6 of 27 cases (22%). There was consecutive haemorrhagic transformation in four patients with PSH (p = 0.209, Fisher's exact test). Preinterventional predictors for the occurrence of PSH in our series were a long interval between clinical onset and recanalization (p = 0.028), a long procedure time (p = 0.010), and a high number of recanalization attempts (p = 0.001). PSH had no significant impact on clinical outcome (modified Rankin Scale) at discharge (p = 0.419) or at 3 months (p = 0.396). There were no significant correlations between PSH and thrombectomy devices (Solitaire: p = 0.433, Trevo Pro: p = 0.124).
  
  
  CONCLUSIONS
  PSH after endovascular mechanical thrombectomy in acute ischemic stroke are likely to occur in complicated cases in which more than one revascularisation attempt is performed. PSH per se do not appear to be associated with an impaired clinical outcome or an elevated risk for consecutive haemorrhage.
authors.affiliation: Klinik für Diagnostische und Interventionelle Neuroradiologie, Uniklinik Aachen, Pauwelsstr. 30, 52074, Aachen, Germany.
authors.forename: Omid
authors.initials: O
authors.lastname: Nikoubashman
authors.forename: Arno
authors.initials: A
authors.lastname: Reich
authors.forename: Rastislav
authors.initials: R
authors.lastname: Pjontek
authors.forename: Michael
authors.initials: M
authors.lastname: Jungbluth
authors.forename: Martin
authors.initials: M
authors.lastname: Wiesmann
mesh_terms: D000368:Aged; D057510:Endovascular Procedures / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008297:Male; D012189:Retrospective Studies; D015607:Stents; D020521:Stroke / Q000601:surgery*; D013345:Subarachnoid Hemorrhage / Q000209:etiology*; D017131:Thrombectomy / Q000009:adverse effects*