摘要
目的 以细粒棘球蚴(Echinococcus granulosus,EG)感染绵羊并诱发过敏性休克动物模型为基础,观察休克期间电解质、血气的动态变化趋势,为其防治提供理论依据。方法 人工感染EG绵羊15只,用EG囊液粗制抗原攻击发敏复制过敏性休克动物模型,分别于抗原攻击前后各时点,经右颈内动脉采血,测定电解质及血气各指标。结果 抗原攻击后3.5min血K+显著增高(P<0.01),30 min后降至基础值水平,其它电解质无显著变化;动脉氧分压(PaO2)在抗原攻击后即持续性降低(P<0.01),动脉血二氧化碳分压(PaCO2)在8 min时有显著升高(P<0.01),以后逐渐恢复,pH值明显下降;血细胞容积(Hct)及血红蛋白(Hb)在抗原攻击后3.5 min增高显著(P<0.05)。结论 EG诱发的过敏性休克电解质及血气变化剧烈,表现为明显的高血钾、酸中毒、PaO2的持续降低以及PaCO2的增高,且反应迅速,消退较快。
Objective To access the changes in blood gases and electrolytes during anaphylactic shock induced by Echinococcus granulosus (EG) in sheep.Methods Fifteen healthy sheep of either sex weighing 31.2 ± 3.5 kg were repeatedly infected with EG for six months. The infected sheep were anesthetized with intramuscular thiopental 20mg·kg-1 and ketamine 15 mg·kg-1. The animals were breathing spontaneously and placed on the left side. ECG (lead Ⅱ) was monitored. Swan-Ganz catheter was placed via right internal jugular vein for hemodynamic monitoring. Anaphylactic shock was induced with antigen prepared from fluid in EG capsules. Blood samples were taken from right internal carotid artery before shock (T0) and 3.5 min (T1 ), 8 min (T2), 15 min (T3), 30 min (T4) and 60 min (T5 ) after shock was induced for determination of blood Na+ , K+ , Hct, Hb, pH, PaO2 , PaGO2 and HCO3-. Shock was confirmed by hypotension (MAP decreased by 30%), tachypnea, dyspnea, agitation and pupil dilation. Results Three sheep did not develop shock and two sheep died of severe shock within 10 min after iv antigen challenge. Blood K+ significantly increased at T1 and T2 after antigen challenge and then gradually returned to baseline value at T5 . PaO2 decreased, PaGO2 increased and pH deceased after challenge. Hct and Hb also increased significantly after challenge. Conclusion There are significant changes in blood gas and electrolytes indicated by hyperkalemia, acidosis and hypoxemia during anaphylactic shock induced by EG.
出处
《中华麻醉学杂志》
CAS
CSCD
北大核心
2003年第2期124-127,共4页
Chinese Journal of Anesthesiology
基金
国家自然科学基金(39860078)
