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目的研究先天性心脏病患儿体外循环手术中采用中度低温合并低流量灌注技术的可行性。方法３０例手术患儿体外循环降温至肛温２５．６±０．８４℃，食管温度２４．１±１．３２℃，鼓膜温度２３．８±１．４１℃，维持流量１．２３±０．０９Ｌ／ｍｉｎｍ２，转流时间９５．４±３４．６分钟，主动脉阻断时间５１．４±２０．２分钟，低流量维持时间４５．７±２２．４分钟。结果低流量灌注时静脉血氧饱和度均在８０％以上，除１例外，其余均无缺氧酸中毒的血气表现，血乳酸值也未升高，术后恢复良好。结论中度低温体外循环选用低流量灌注可满足机体代谢的需要，有利于减少长时间高流量灌注的不良反应。
Objective To study the feasibility of using hypothermia combined with low perfusion in cardiopulmonary bypass in children with congenital heart disease. Methods Thirty patients with surgery underwent cardiopulmonary bypass. The rectal temperature was decreased to 25.6 ± 0.84 ℃, the esophagus temperature was 24.1 ± 1.32 ℃, the tympanic membrane temperature was 23.8 ± 1.41 ℃ and the flow rate was maintained at 1.23 ± 0 .09L / minm2, the commutation time was 95.4 ± 34.6 minutes, the aorta occlusion time was 51.4 ± 20.2 minutes and the low-flow maintenance time was 45.7 ± 22.4 minutes. Results Low blood perfusion perfusion venous oxygen saturation in more than 80%, except for 1 case, the rest were no hypoxia poisoning blood gas performance, blood lactate did not rise, good recovery after surgery. Conclusions The moderate hypothermic cardiopulmonary bypass chooses low perfusion to meet the needs of body metabolism, which is beneficial to reduce the adverse reaction of high perfusion.