活性炭对常见化学物经口中毒的疗效评价研究
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摘要
我国的突发化学物经口中毒事件危害严重,如在患者中毒早期的毒物清除措施较为得当,将可降低病死率。其中口服活性炭因其吸附效能好、不良反应少、给药方便等优点,在国外常被作为毒物经口中毒早期最重要的清除措施。目前存在的问题是,国内外尚无评价其吸附效能相关系统综述或大样本RCT的文献报道,因此无法肯定化学物,特别是常见化学物经口中毒时应用活性炭的疗效及其程度。
     本研究主要包括以下三部分:(1)系统地搜索已有针对活性炭对常见经口中毒化学物吸附效能研究的文献报道,归纳和总结其研究结果,筛选出研究结果不明确的常见化学物(如杀鼠剂、亚硝酸盐),以便于进一步开展体外实验和动物实验探索活性炭对其吸附效能;(2)通过体外实验评价活性炭对亚硝酸钠的吸附效能,同时探索了活性炭的应用对致死剂量和中毒剂量亚硝酸钠染毒大鼠的治疗效果;(3)通过体外实验评价活性炭对溴敌隆的吸附效能,同时评价了活性炭的应用对致死剂量染毒家兔的治疗效果。
     研究结果发现:(1)目前针对常见经口中毒化学物开展的活性炭吸附效能研究文献数量少,且存在方法设计不完善和结果解释不妥的问题,难以肯定中毒事件中应用活性炭的疗效,因此,作为选题,本研究选取国内常见的经口中毒化学物亚硝酸钠和溴敌隆分别开展体外实验和动物实验探索活性炭对其吸附效能是得当的;(2)亚硝酸钠实验部分证明,体外条件下活性炭可以吸附亚硝酸钠,且其吸附率不受pH值影响,但随活性炭-亚硝酸钠质量比值而有变化;动物实验则显示,活性炭的应用不能显著延长染毒大鼠抽搐出现时间或死亡时间,不能改善其抽搐程度,不能降低其死亡率或高铁血红蛋白含量;(3)体外实验各pH值水平、各浓度水平溴敌隆溶液经活性炭吸附后均低于最低检出浓度,可以认为活性炭对溴敌隆吸附均较完全。但溴敌隆致死剂量经口染毒家兔给予活性炭治疗后,虽然血中溴敌隆浓度较未治疗组有所降低,但其PT、APTT和死亡率均没有显著性差异。
     综合体外实验和动物实验结果,本研究建议在发生亚硝酸钠经口中毒时不将活性炭作为常规的救治措施,并开展相关研究,探索多次给活性炭或者降低染毒剂量后活性炭对溴敌隆中毒的治疗效果。
Incidents caused by oral poisoning of chemicals have led to great harm to China. However,fatality might be cut down,if removal measures were taken promptly at the early stage of poisoning.Activated charcoal is the most favorable chioce of gut decontamination abroad while intoxication happened because of its excellent adsorption efficacy,rare side effects and feasibility of pre-hospital treatment.The existing problem lies in that few systematic review or large sample RCT have been carried out on the adsorbing efficacy of the common chemicals by activated charcoal at home and abroad.It is,therefore,impossible to confirm the therapeutic effect as well as the degree of effect of activated charcoal in oral poisoning of common chemicals.
     The present study includes three parts as follows:(1) Browse all documents related to the adsorbing efficacy of activated charcoal on chemicals that may bring to oral poisoning incidents,summarize results of those documents systematically and focus on the indefinite conclusion(such as rodenticide and nitrite) to find out subjects to be studied the therapeutic effect in vitro and in vivo;(2)The adsorption effect of activated charcoal on nitrite were studied in vitro while the therapeutic effect of activated charcoal on rats intoxicated with nitrite of lethal dose as well as toxic dose were studied in vivo;(3)The adsorption effect of activated charcoal on bromadiolone were studied in vitro and in vivo,too.
     Results showed that,(1) only a few articles focusing on the adsorbing efficacy of common chemicals by activated charcoal were found,and most of which were designed imperfectly and explained inappropriately.It remained uncertain that whether activated charcoal should be used or not when oral sodium nitrite and bromadiolone poisoning incidents,two of common chemicals that may lead to oral poisoning incidents in China,break out.It's the basis of subject selected of the present study,to evaluate the adsorptive efficacy of activated charcoal in vitro and in vivo;(2) As the in vitro study had found,sodium nitrite could be adsorbed by activated charcoal,with the adsorption rate influenced by the activated charcoal-sodium nitrite ratio significantly but not by pH.The animal study,however, showed that neither convulsion alleviated or delayed,nor mortality rate or the blood metahemoglobin was decreased when activated charcoal was used;(3) The concentration of bromadiolone in each activated charcoal group was all brought down below the detection limit in vitro,which proved the effective adsorption of activated charcoal on bromadiolone.But as to animal study,the PT,APTT and mortality rate showed no improvement when activated charcoal was used for the rabbits intoxicated with bromadiolone of lethal dose,though the plasma concentration of bromadiolone did have been cut down significantly.
     In conclusion,we suggest that activated charcoal would not be used as conventional treatment in oral sodium nitrites poisoning.On the other hand,more studies on the therapeutic effect of activated charcoal in bromadiolone poisoning of toxic dose as well as the therapeutic effect of multi-dose activated charcoal in bromadiolone poisoning should be carried out.
引文
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