Cerebral Autoregulation in Neonates: Physiology and Beyond

The neonatal brain's ability to maintain relatively stable cerebral blood flow (CBF) amidst swings in arterial pressure-known as cerebral autoregulation is a delicate and evolving physiological defense. In preterm infants, this autoregulatory mechanism is immature and easily overwhelmed by environmental and clinical stressors. Anatomical underdevelopment of cerebral vasculature restricts the effective autoregulatory range, making these infants especially vulnerable to fluctuations in perfusion. Assessing cerebral autoregulation in neonates requires approaches that are both accurate and safe for fragile patients. Non-invasive monitoring techniques dominate current research, with near-infrared spectroscopy (NIRS) emerging as the most practical bedside tool. By measuring cerebral oxygen saturation continuously, NIRS allows clinicians to examine how changes in mean arterial pressure (MAP) affect brain oxygenation. Future directions emphasize integrating NIRS with multimodal monitoring (EEG, Doppler ultrasound, and continuous blood pressure) to create a fuller picture of cerebrovascular health. Such approaches could guide interventions in real time, helping clinicians avoid both hypoperfusion and hyperperfusion. Ultimately, translating autoregulation monitoring into routine care may provide a path toward precision neuroprotection, especially for preterm and critically ill neonates.