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机构地区:[1]首都医科大学附属北京儿童医院急救中心,100045
出 处:《中国小儿急救医学》2009年第3期253-255,259,共4页Chinese Pediatric Emergency Medicine
基 金:北京市自然科学基金资助项目(7052027)
摘 要:目的评价多巴胺、多巴酚丁胺和去甲肾上腺素对感染性休克兔胃黏膜二氧化碳分压与动脉血二氧化碳分压差[P[g-a]CO2]及肠系膜上动脉血流量的影响。方法静脉注入内毒素复制兔感染性休克模型,达到休克标准后随机分成3组:多巴胺组、多巴酚丁胺组和去甲肾上腺素组,每组各8只。每组均按20ml/(kg·h)输注生理盐水进行容量复苏,同时分别持续静脉滴注多巴胺5μg/(kg·min)、多巴酚丁胺5μg/(kg·min)和去甲肾上腺素1μg/(kg·min)。连续监测平均动脉压、心率、心脏指数和肠系膜上动脉血流指数,每10分钟测定胃黏膜二氧化碳分压1次,每小时进行动静脉血气分析并测定动脉血乳酸。结果静脉注射内毒素后,3组平均动脉压、心脏指数及肠系膜血流量指数均明显下降,但P(g-a)CO2明显增加,氧输送能力下降,动脉血乳酸升高。分组干预2h后,去甲肾上腺素组的平均动脉压为(70±3)mmHg(1mmHg=0.133kPa),明显高于多巴胺组[(66±4)mmHg]和多巴酚丁胺组[(65±4)mmHg],差异有显著性(P〈0.05);去甲肾上腺素组的肠系膜血流量指数[(18.7±2.9)mV(kg·min)]亦明显高于多巴胺组[(16.2±1.6ml/(kg·min)]和多巴酚丁胺组[(15.8±1.9)ml/(kg·min)],差异有显著性(P〈0.05);去甲肾上腺素组P(g-a)CO2[(30±6)mmHg]较多巴酚丁胺组[(23±5)mmHg]明显降低(P〈0.05)。结论感染性休克兔进行容量复苏时,去甲肾上腺素对胃肠灌注的改善较小剂量多巴胺和多巴酚丁胺更为明显。Objective To assess the effects of dopamine, dobutamine and norepinephrine on the P(g-a) CO2 and superior mesenteric blood flow in septic shock. Methods Rabbit septic shock model was established by challenging with intravenous injection of lipopolysaccharides from Escherichia coli (2 mg/kg). The rabbits with septic shock were randomly assigned to 3 groups-dopamine group ( n = 8 ), dobutamine group ( n = 8 ) and norepinephrine group ( n = 8). Apart from volume resuscitation with normal saline solution [ 20 ml/( kg · h) ], dopamine [ 5 Ixg/( kg ·min) ], dobutamine [ ( 5 μg,/( kg · min ) ] and norepinephrine [ ( 1 μg/( kg · min) ] were infused in dopamine group, dobutamine group and norepinephrine group respectively. Cardiac index (CI) and superior mesenteric blood flow index (SMBFI) were continuously monitored by doppler flowmeter. Gastric mucosal PCO2 was evaluated by gas tonometry every 10 rain. Arterial and venous blood gas analyses and lactate levels were measured every 1 h. Results MAP,CI,and SMBFI significantly decreased and P(g-a) CO2 increased after lipopolysaccharides infusion in three groups. After 2-hour treatment, MAP in norepinephrine group [ (70 ± 3) mm Hg ] was higher than that of dopamine group [ (66 ± 4) mm Hg ] and dobutamine group [ (65 ± 4 ) mm Hg ] (P 〈 0. 05 ). SMBFI in norepinephrine group [(18.7±2.9) ml/(kg · min)] was higher than that of dopamine group [(16.2±1.6) ml/(kg · min)] and dobutamine group[ ( 15. 8 ± 1.9) ml/( kg · min) ] ( P 〈 0. 05 ). P(g-a) CO2 in norepinephrine group [ ( 30 ± 6 )mm Hg ] was lower than that of dobutamine group [ ( 23 ± 5 ) mm Hg ] ( P 〈 0. 05 ). Conclusion As an adjuvant therapy of volume resuscitation, norepinephrine is more effective than low dose dopamine and dobutamine in improving splanchnic perfusion.
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