随着医疗技术的提高,先天性心脏病患儿的手术年龄限制有所降低,而婴幼儿先心术后易出现肺部感染及心功能衰竭。婴幼儿免疫力低,开胸手术损伤大,后期治疗就成为了能否挽救生命的关键。硝普钠属动静脉血管扩张剂,具有增加心排出量、降低心肌耗氧量,降低肾血管阻力和不影响冠脉血 With the improvement of medical technology, the surgical age limit of children with congenital heart disease has been reduced, while infants and young children prone to pulmonary infection after heart surgery and heart failure. Infants and young children with low immunity, thoracic surgery injury, post-treatment has become the key to saving lives. Sodium nitroprusside is an arteriovenous vasodilator, with increased cardiac output, reduce myocardial oxygen consumption, reduce renal vascular resistance and does not affect coronary blood