油酸致兔ARDS模型长期效果的多因素析评

目的:研究油酸致ARDS模型对疾病的长期模拟效果,并探讨内在机制。方法:选择健康新西兰大白兔30只,经左侧耳缘静脉按油酸0.1 ml/kg的剂量缓慢注入,观察动物呼吸、心率变化,测定氧合指数(PaO2/FiO2)、动脉氧分压、二氧化碳分压。分别于注射油酸后6小时、24小时、48小时以及72小时处死动物,收集静脉血及肺泡灌洗液(BALF),ELISA法检测肿瘤坏死因子α(TNF-α)、白细胞介素6(IL-6)变化。H-E染色镜下观察肺部病理改变,计算肺组织含水量以判断肺损伤程度。结果:①所有模型动物在6小时内均出现ARDS表现。②6h组、24h组以及48h组氧合指数(PaO2/FiO2)与正常对照组相比均明显降低(P<0.05),且符合ARDS诊断标准。72h组氧合指数(PaO2/FiO2)虽然也明显降低,但未达到ARDS的诊断标准。③血浆中TNF-α与IL-6明显升高(P<0.05),于致伤后72小时后有所恢复,但仍高于正常。BALF中TNF-α也出现相同变化趋势,而IL-6则在试验期间持续高表达。④镜下可见两肺充血、出血,肺泡及肺间质水肿,透明膜形成,大量中性粒细胞浸润,终末支气管上皮细胞变性坏死,双肺含水...

Models of rabbits with acute respiratory distress syndromes induced by oleic acid:multivariate analysis of long-term effects

Objective: To investigate the long-term effects of ARDS model induced by oleic acid and investigate the mechanism.Methods: Thirty healthy New Zealand white rabbits were slowly injected 0.1 ml/kg oleic acid through the left ear vein.The respiration,heart rate,oxygenation index,arterial partial,pressure of oxygen,arterial partial pressure of carbon dioxide were detected.The animals were sacrificed at 6h,24h,48h and 72h after injected oleic acid.The blood and bronchoalveolar lavage fluid(BALF) were collected a...