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烧伤患者的麻醉

Authors
Sam R Sharar, MD
Hernando Olivar, MD
Section Editor
Michael Avidan, MD
Deputy Editor
Nancy A Nussmeier, MD, FAHA
Translators
王洁, 主治医师

引言

烧伤患者的整个围术期处理可能均需要麻醉医师参与,包括术前气道处理、术中麻醉、术后重症监护以及术后疼痛的处理。本专题将总结烧伤患者麻醉处理的这些方面。烧伤患者处理的其他问题参见其他专题。 (参见“重度烧伤患者的治疗概述”“成人中重度热烧伤的紧急处理”“轻度热烧伤的治疗”)

麻醉前会诊:重点考虑因素

烧伤

烧伤范围和严重程度 — 对烧伤区占全身体表面积(total body surface area, TBSA)百分比以及烧伤位置和严重程度的估计至关重要,因为这些因素会影响麻醉处理的诸多方面,包括气道处理、液体管理、药物用法用量,以及温度调节。烧伤面积占TBSA百分比的估算基于Lund-Browder图表(图 1)。重度烧伤被定义为,成人中烧伤面积大于25%TBSA的Ⅱ度烧伤,或10岁以内儿童或40岁以上成年人中烧伤面积大于20%TBSA的Ⅱ度烧伤(表 1)。重度烧伤也包括累及超过10%TBSA的Ⅲ度烧伤。高压电烧伤、烟雾吸入性损伤,以及面部、眼睛、耳、手、足或会阴的烧伤也被界定为重度烧伤。重度烧伤可能会引起严重的生理学及炎性反应,这对随后的住院诊疗有直接影响。 (参见“重度烧伤患者的治疗概述”“烧伤的分类”)

液体复苏 — 热损伤后的最初48小时是烧伤的“复苏期”或“低潮期”。这期间会发生全身炎症反应,并伴随着因毛细血管通透性增加所致的血浆液体、电解质和蛋白质流失[1-3]。可根据一些公式(如,Parkland公式)进行有效的液体复苏,复苏终点目标是为了实现美国烧伤协会(American Burn Association, ABA)推荐的尿量为0.5-1mL/(kg·h)[4]。过多的静脉输液[如,液体泛滥(fluid creep)]会使患者有发生肺水肿、腹腔间隔室综合征或肢体循环受损的风险。 (参见“成人中重度热烧伤的紧急处理”,关于‘液体复苏’一节)

心血管系统 — 在严重烧伤后即刻的复苏期,患者的心输出量(cardiac output, CO)较低,处于一种“低潮”状态[3,5](参见“重度烧伤的并发症和远期结局”,关于‘心脏衰竭’一节)。由于血管通透性增加诱导的血浆丢失所致的低血容量、心肌对儿茶酚胺反应减弱,冠脉血流量减少引起的心肌缺血,以及加压素水平升高引起的全身血管阻力增加,患者的心输出量相比于基线水平可减少多达60%[6,7]。若液体治疗时初始复苏不足之后又复苏过度,则可导致肺水肿和右心衰竭。

烧伤后72-96小时,在恢复期期间,心血管变化发展至“涨潮”状态。这期间出现的高动力和高代谢反应包括心输出量增加、心动过速、心肌耗氧量增加,以及全身血管阻力降低[3]。

                     

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Literature review current through: 2017-07 . | This topic last updated: 2016-10-11.
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