
Keywords: PVL، leukomalacia periventricular; CrSO2, Cerebral regional tissue oxygenation; IVH, Intraventricular hemorrhage; NICU, Neonatal intensive care unit; NIRS, Near-infrared spectroscopy; PVL, Periventricular leukomalacia; UA, Umbilical arterial; VLBW, Very low birth weight