What it is
The authors built an in silico model of static cerebral autoregulation that runs on realistic microvascular networks, giving vessel-by-vessel views of vasoreactivity and perfusion. The simulations show a hierarchy in which pial surface arteries act as key regulators that buffer pressure changes across large vascular territories, with arterial density a decisive determinant of a network's autoregulatory capacity. In the model, during reperfusion after stroke, changes in vasoreactivity, rather than the extent of collateral vessels alone, emerged as the main contributor to pathogenic hyperperfusion, and simulated chronic loss of vascular reactivity disturbed downstream capillary perfusion and altered the autoregulation curve.
Why it matters
Keeping cerebral blood flow stable as blood pressure varies is crucial for normal brain function, and this autoregulation is often impaired in ischemic stroke, yet how local vessel responses interact across the network to stabilize perfusion had remained poorly understood. The authors highlight myogenic tone as a potential therapeutic target to reduce complications of reperfusion after stroke.
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Filed underTraumatic Brain Injury and Neurovascular Disturbances, Cerebrospinal fluid and hydrocephalus, Barrier Structure and Function Studies