Predictors of poor outcome despite recanalization: a multiple regression analysis of the NASA registry Article (Web of Science)


  • BackgroundMechanical thrombectomy with stent-retrievers results in higher recanalization rates compared with previous devices. Despite successful recanalization rates (Thrombolysis in Cerebral Infarction (TICI) score ≥2b) of 70–83%, good outcomes by 90-day modified Rankin Scale (mRS) score ≤2 are achieved in only 40–55% of patients. We evaluated predictors of poor outcomes (mRS >2) despite successful recanalization (TICI ≥2b) in the North American Solitaire Stent Retriever Acute Stroke (NASA) registry.MethodsLogistic regression was used to evaluate baseline characteristics and recanalization outcomes for association with 90-day mRS score of 0–2 (good outcome) vs 3–6 (poor outcome). Univariate tests were carried out for all factors. A multivariable model was developed based on backwards selection from the factors with at least marginal significance (p≤0.10) on univariate analysis with the retention criterion set at p≤0.05. The model was refit to minimize the number of cases excluded because of missing covariate values; the c-statistic was a measure of predictive power.ResultsOf 354 patients, 256 (72.3%) were recanalized successfully. Based on 234 recanalized patients evaluated for 90-day mRS score, 116 (49.6%) had poor outcomes. Univariate analysis identified an increased risk of poor outcome for age ≥80 years, occlusion site of internal carotid artery (ICA)/basilar artery, National Institute of Health Stroke Scale (NIHSS) score ≥18, history of diabetes mellitus, TICI 2b, use of rescue therapy, not using a balloon-guided catheter or intravenous tissue plasminogen activator (IV t-PA), and >30 min to recanalization (p≤0.05). In multivariable analysis, age ≥80 years, occlusion site ICA/basilar, initial NIHSS score ≥18, diabetes, absence of IV t-PA, ≥3 passes, and use of rescue therapy were significant independent predictors of poor 90-day outcome in a model with good predictive power (c-index=0.80).ConclusionsAge, occlusion site, high NIHSS, diabetes, no IV t-PA, ≥3 passes, and use of rescue therapy are associated with poor 90-day outcome despite successful recanalization.


  • Linfante, Italo
  • Starosciak, Amy K
  • Walker, Gail R
  • Dabus, Guilherme
  • Gupta, Rishi
  • Sun, Chung-Huan J
  • Martin, Coleman
  • Holloway, William E
  • Mueller-Kronast, Nils
  • English, Joey D
  • Malisch, Tim W
  • Marden, Franklin A
  • Bozorgchami, Hormozd
  • Xavier, Andrew
  • Rai, Ansaar T
  • Froehler, Michael T
  • Badruddin, Aamir
  • Nguyen, Thanh N
  • Taqi, M Asif
  • Abraham, Michael G
  • Janardhan, Vallabh
  • Shaltoni, Hashem
  • Novakovic, Roberta
  • Yoo, Albert J
  • Abou-Chebl, Alex
  • Chen, Peng R
  • Britz, Gavin W
  • Kaushal, Ritesh
  • Nanda, Ashish
  • Issa, Mohammad A
  • Nogueira, Raul G
  • Zaidat, Osama O

publication date

  • 2016

number of pages

  • 5

start page

  • 224

end page

  • 229


  • 8


  • 3