The Next Era in Cerebrovascular Autoregulation Assessment?

Management of the neurocritical patient has undergone an unprecedented conceptual and technological metamorphosis over the last seven decades. What was once understood as a simple, passive hydrostatic relationship between the heart and the brain has evolved into a discipline of precision, where individual dynamic physiology supersedes standardized protocols. For much of the 20th century, clinical practice was anchored in the dogma that cerebral blood flow (CBF) remained constant within broad and fixed blood pressure limits. Recent advances in bioengineering and signalprocessing technologies have demonstrated that the limits of cerebrovascular autoregulation (CA) are not fixed physiological constants, but dynamic boundaries that vary considerably between patients and over time. This recognition has prompted a paradigm shift away from standardized perfusion targets toward individualized cerebrovascular management. In this context, CA is no longer viewed solely as a physiological phenomenon; it has emerged as a measurable and actionable clinical variable. Continuous bedside assessment of autoregulatory function now offers the opportunity to tailor hemodynamic interventions to the individual patient, with the goal of preserving cerebral perfusion and minimizing secondary brain injury.