The common tools to evaluate the sedation and analgesia have some limitations.The sedatives and analgesics we use now have some side effects too. 目前常用的镇静和镇痛评估工具存在一定的局限性，常用药物也存在一些不良反应。
Brain ultrasound is a non-invasive assessment commonly used in clinics to examine the anatomic structures and hemodynamic characteristics of the nervous system in infants. 摘要脑部超音波是一项临床上普遍使用于新生儿的非侵入性神经评估工具，用来了解其神经结构以及血液动力学的情况。
