The superior vena cava (SVC) is a large vein responsible for the venous return of blood from structures located superior to the diaphragm. The flow in the SVC can be assessed with Doppler ultrasound and can be used as a proxy for cerebral perfusion. Early clinical research studies showed that low SVC flow, particularly if for a prolonged period, was associated with short term morbidity such as intraventricular hemorrhage, mortality, and poorer neurodevelopmental outcomes. However, these findings have not been consistently reported in more recent studies, and the role of SVC flow in early management and as a predictor of poor long-term neurodevelopment has been questioned. This paper provides an overview of SVC assessment, the expected range of findings, and reviews the role of SVC flow as a diagnostic and monitoring tool for the assessment of perinatal perfusion.

上腔静脉（SVC）是大静脉，负责从位于横the膜上方的结构中静脉血液回流。SVC中的血流可以用多普勒超声评估，并且可以用作脑灌注的代理。早期的临床研究表明，SVC流量低，尤其是长时间使用，会导致短期发病，例如脑室内出血，死亡率和神经发育不良。但是，这些发现在最近的研究中并未得到一致的报道，人们质疑SVC在早期治疗中的作用以及长期不良神经发育的预测指标。本文概述了SVC评估，预期结果范围，