Relevance of cerebral microbleeds with leaky blood brain barrier in traumatic brain injury and protective role of interferon-gamma: A cohort study

Résumé fourni par la source

Objectives: Cerebral microbleeds (CMBs), which present as foci of hypointensities on T2*-weighted Magnetic Resonance Imaging (MRI) are associated with weakened vessel walls. CMBs are also a frequent finding in traumatic brain injury (TBI) in association with poor outcome. We investigated whether a combination of susceptibility weighted imaging (SWI) and dynamic contrast enhanced (DCE) MRI could accurately identify characteristics of CMBs that are most relevant to TBI. Materials and Methods: ranges of normal-appearing brain (NAB) areas were quantified and two sub-classes of CMBs-leaky and non-leaky CMBs-were identified. Characteristics and spatial distribution of the quantified imaging metrics and the immunological blood panel results were then compared across mild versus moderate-severe TBI groups, as classified by Glasgow Coma Scale. Results: More severe TBI was associated with CMBs exhibiting leaky BBB as quantified by DCE-MRI. Higher blood levels of interferon gamma (IFN-γ) were associated with lower number of CMBs in TBI patients at more than 8 days post-TBI. Discussion: combined DCE-MRI and SWI confirmed that CMBs with leaky BBBs are more prevalent in moderate-severe TBIs compared. Higher levels of IFN-γ appeared to have been associated with fewer CMBs in the sub-acute stage of TBI.

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