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出生体重小于1500g的早产儿颅内出血发生率为40～50%,个别作者发现高达90%。脑室周围出血(PVH)和脑室内出血(IVH)为最常见、最严重的类型。PVH又称室管膜下生发层出血。生发层富含血管、细胞、胶质,代谢旺盛,在胎龄24～32周时特别明显,足月时消失。在通常发生PVH的部位,血流常呈独特的U弯。出血部位与胎龄有关,小于28周者多起源于尾状核体部,大于28周者多起源于Monro氏
The incidence of intracranial hemorrhage in preterm infants weighing less than 1500 g is 40-50%, with individual authors finding up to 90%. Peripheral hemorrhage (PVH) and intraventricular hemorrhage (IVH) are the most common and severe types. PVH, also known as ependymal germinal layer bleeding. Germinal layer is rich in blood vessels, cells, glia, strong metabolism, especially in the gestational age of 24 to 32 weeks, disappear in term. In the area where PVH usually occurs, the blood flow often presents a unique U-bend. Bleeding site and gestational age, less than 28 weeks mostly originated in the caudate nucleus, more than 28 weeks mostly originated in Monro’s