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作 者:李红日[1] 宋国维[1] 甘小庄[1] 崔小岱[2] 孙丽萍[2] 孙春荣[2]
机构地区:[1]首都儿科研究所附属儿童医院急诊科,100020 [2]首都儿科研究所临床中心实验室
出 处:《中国小儿急救医学》2010年第1期40-42,共3页Chinese Pediatric Emergency Medicine
基 金:国家科技攻关计划课题(2003BA712A11-10)
摘 要:目的建立大鼠肺内源性急性肺损伤/急性呼吸窘迫综合征(ALI/ARDS)模型。方法大肠杆菌[O111B4,(4.0—6.0)×10^12 CFU/L]3ml/kg气管注射制作大鼠肺内源性ALI模型。分别于注射大肠杆菌后12、24、36、48、72h共5个时间点给予机械通气,监测氧合指数(PaO2/FiO2)及胸肺动态顺应性(Cdyn)。肺组织常规固定进行病理学检查。结果12、24、36A8、72h大鼠PaO2/FiO2分别为(30,71±7.95)kPa、(21.66±5.34)kPa、(21.09±4.75)kPa、(25.01±8.78)kPa、(33.82±8.02)kPa,均低于正常组(63.82±3.03)kPa(P〈0.01)。12、24、36、48、72h大鼠Cdyn分别为(4.23±0.13)ml/(kg·kPa)、(4.19±0.96)mV(kg·kPa)、(4.28±0.69)ml/(kg·kPa)、(4.44±0.62)mV(kg·kPa)、(4.58±0.35)ml/(kg·kPa),均低于正常组(8.16±0.78)mV(kg·kPa)(P〈0.01)。12、24、36、48、72h大鼠Au发生率分别为71.4%、100%、100%、83,3%、57.1%;ARDS发生率分别为28.6%、85,7%、83.3%、66.7%、14.3%。病理学改变方面,随着感染时间延长,由肺内少量渗出液到肺泡壁明显水肿,肺泡腔内出现大量渗出液和炎症细胞,可见透明膜形成以及严重肺泡萎陷,但在72h炎症已明显减轻。结论本实验经气管滴人大肠杆菌建立了肺内源性ALI/ARDS动物模型,分时间点观察了病情演变,为有效利用动物模型提供了资料。Objective To establish pulmonary acute lung injury(ALl) model in rats. Methods ALl model was induced in rats by intratracheal Escherichia coli injection [ 3 ml/kg, O111 B4, ( 4. 0 - 6.0 ) ×10^12 CFU/L]. Mechanical ventilation was applied 12,24,36,48 and 72 h after Escherichia coli injection, PaO2/FiO2 and dynamic compliance were recorded,and the normal control group was also subjected to mechanical ventilation. After the experiment, lungs were fixed with formalin to perform pathological examination. Results At 12,24,36,48 and 72 h,the PaO2/FiO2 were (30.71 ±7.95) kPa, (21.66 ±5.34) kPa, (21.09 ± 4. 75 ) kPa, ( 25.01 ± 8. 78 ) kPa and ( 33. 82 ± 8.02 ) kPa, respectively, which were significantly lower than that in the normal control group(63. 82 ±3.03 ) kPa (P 〈 0. 01 ). At 12,24,36,48 and 72 h, the Cdyn were (4.23±0. 13) ml/(kg.kPa),(4. 19 ±0.96) ml/(kg.kPa), (4.28 ±0.69) ml/(kg.kPa), (4.44 ±0. 62)ml/(kg.kPa) and (4. 58 ±0. 35) mL/(kg.kPa) respectively,which were significantly lower than that in the normal control group (8.16±0. 78 ) ml/(kg, kPa) ( P 〈 0. 01 ). At 12,24,36,48 and 72, the percentage of ALI was 71.4%, 100. 0%, 100. 0%, 83.3 % and 57. 1% respectively, and the percentage of ARDS was 28.6% ,85.7% ,83.3% ,66. 7% ,14. 3% respectively. As for pathological examinations,predominance of alveolar collapse, fibrinous exudates, alveolar wall edema and neutrophil recruitment into the alveolar space was observed. Hyaline membrane formation was found. At 72 h, inflammation was relieved. Conclusion We successfully established pulmonary ALI/ARDS model in rats induced by intratracheal Escherichia coli injection, and acquired some useful information by observing the lung function and morphological changes at different time points.
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