图2 胫骨近端定位
4、骨髓腔内输液的速度
骨髓腔内输液的速度是否能达到静脉输液的速度一直倍受关注。因为骨髓腔内血管的压力通常相当于身体平均动脉压的三分之一,一般约为35/25mm Hg,所以,在输液过程中不同于静脉输液,骨髓腔内输液需要适当加压。研究发现,在加压的条件下,骨髓腔内输液的速度可达到原速度的数倍。国外文献比较患者不同部位的输液速度发现,在不加压和加压情况下,经胫骨输液速度为73ml/min和165ml/min,经肱骨为84ml/min和153ml/min。Pasley等的研究发现,新鲜尸体在加压300mmHg的情况下,经胸骨的输液的速度为(93.7±37.9)ml/min,经肱骨为(57.1±43.5)ml/min,经胫骨为(30.7±18.7)ml/min,经胸骨的输液的速度最快。国内研究显示,经胫骨输液速度波动在(6~20)ml/min,加压后可达(50~125)ml/min。因此,使用加压输液袋或者输液泵进行骨髓腔内输液,可以达到快速补液的效果。
推荐意见6:如需快速补液,建议使用输液泵或加压输液袋进行骨髓腔内输液。
五、骨髓腔内输液通路的临床应用
1、适应症
任何疾病急需经血管通路补液治疗或药物治疗但无法建立常规静脉通路,均可采用骨髓腔内输液技术进行治疗。包括:心脏骤停、休克、创伤、大面积烧伤、严重脱水、持续性癫痫、呼吸骤停、恶性心律失常等。
2、禁忌症
绝对禁忌证包括:穿刺部位骨折、穿刺部位感染、假肢等。相对禁忌证包括:成骨不全、严重骨质疏松、缺少足够解剖标志、穿刺点48小时之内接受过骨髓腔输液等。
3、并发症及处理
尽管骨髓腔内输液是一项相对安全的技术,但仍有一些潜在的并发症。
(1)液体外渗:液体外渗是骨髓腔内输液技术中最常见的并发症,多因穿刺过浅、过深、留置时间过长、导管脱出、在同一骨骼尝试多次骨髓腔内置管等引起。一旦发现有液体外渗应立即停止给药,拔出穿刺针。如果大量的液体外渗没有被及时察觉,会造成局部肌肉及皮下组织坏死,严重者可引起骨筋膜室综合征。因此必须加强对穿刺点的监测,及时对早期液体外渗进行识别并正确处理,避免严重并发症的发生。
(2)感染:骨髓腔内通路置入后可能引发蜂窝组织炎、局部脓肿、骨髓炎等感染。其中骨髓炎是较为严重的感染性并发症,穿刺针的移位或留置时间过长、穿刺处污染、患有菌血症等都可能是骨髓炎发生的危险因素。在专业的骨髓腔内输液装置应用前的早期的文献报道,骨髓炎的发生率为0.6% ,多与留置时间过长相关。越早拔除骨髓腔内穿刺装置,则感染风险发生率会越低。故一旦发生感染,应拔出穿刺针,给予充分抗感染治疗,必要时引流。
(3)其他少见的并发症包括误入关节内、穿刺针断裂、骨折、脂肪栓塞等,但并未发现骨髓腔内输液对骨内结构及成分产生明显影响。总之,为避免并发症的出现,应严格遵循无菌操作、严密监测穿刺部位、严格控制留置时间,一旦患者周围循环改善,则可以换用其它方式输液。
六、骨髓腔内输液通路的未来展望
骨髓腔内输液技术作为建立血管通路中的一种重要途径,应是急救人员的一个常规选择方案,当遇到危重病人和输液困难等情况时,医务人员能够在极短时间内建立骨髓腔内输液通路,挽救更多生命。骨髓腔内输液技术不仅可将药物或液体快速输入血液循环,在其他方面亦有其优势。比如在血液系统疾病的治疗中,经骨髓腔内进行造血干细胞移植用于治疗血液系统肿瘤已经进入临床试验阶段,其疗效好且移植物抗宿主反应减轻;还可经骨髓腔内通路获取血液样本进行实验室检查,为临床诊治提供更多信息。相信随着研究不断深入,这一技术未来将有更广阔的应用前景。
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参考文献▼
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来源:中国急救医学杂志
出处:急重症世界
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