INFOMATAS multi-center systematic review and meta-analysis individual patient data of dynamic cerebral autoregulation in ischemic stroke

L. Beishon*, J.S. Minhas, R. Nogueira, P. Castro, C. Budgeon, M. Aries, S. Payne, T.G. Robinson, R.B. Panerai, INFOMATAS Group

*Corresponding author for this work

Research output: Contribution to journal(Systematic) Review article peer-review


RationaleDisturbances in dynamic cerebral autoregulation after ischemic stroke may have important implications for prognosis. Recent meta-analyses have been hampered by heterogeneity and small samples.Aim and/or hypothesisThe aim of study is to undertake an individual patient data meta-analysis (IPD-MA) of dynamic cerebral autoregulation changes post-ischemic stroke and to determine a predictive model for outcome in ischemic stroke using information combined from dynamic cerebral autoregulation, clinical history, and neuroimaging.Sample size estimatesTo detect a change of 2% between categories in modified Rankin scale requires a sample size of similar to 1500 patients with moderate to severe stroke, and a change of 1 in autoregulation index requires a sample size of 45 healthy individuals (powered at 80%, alpha = 0.05). Pooled estimates of mean and standard deviation derived from this study will be used to inform sample size calculations for adequately powered future dynamic cerebral autoregulation studies in ischemic stroke.Methods and designThis is an IPD-MA as part of an international, multi-center collaboration (INFOMATAS) with three phases. Firstly, univariate analyses will be constructed for primary (modified Rankin scale) and secondary outcomes, with key co-variates and dynamic cerebral autoregulation parameters. Participants clustering from within studies will be accounted for with random effects. Secondly, dynamic cerebral autoregulation variables will be validated for diagnostic and prognostic accuracy in ischemic stroke using summary receiver operating characteristic curve analysis. Finally, the prognostic accuracy will be determined for four different models combining clinical history, neuroimaging, and dynamic cerebral autoregulation parameters.Study outcome(s)The outcomes for this study are to determine the relationship between clinical outcome, dynamic cerebral autoregulation changes, and baseline patient demographics, to determine the diagnostic and prognostic accuracy of dynamic cerebral autoregulation parameters, and to develop a prognostic model using dynamic cerebral autoregulation in ischemic stroke.DiscussionThis is the first international collaboration to use IPD-MA to determine prognostic models of dynamic cerebral autoregulation for patients with ischemic stroke.
Original languageEnglish
Article number1747493020907003
Pages (from-to)807-812
Number of pages6
JournalInternational journal of stroke
Issue number7
Publication statusPublished - 24 Feb 2020


  • autoregulation index
  • blood pressure
  • cerebral autoregulation
  • cerebral hemodynamics
  • ischemic stroke
  • meta-analysis
  • Cerebral autoregulation

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