感染性休克兔胃黏膜二氧化碳分压变化的意义  被引量:4

Significance of Change of Gastric Mucosal Partial Pressure of Carbon Dioxide in Rabbit Model with Septic Shock

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作  者:曾健生[1] 樊寻梅[1] 钱素云[1] 

机构地区:[1]首都医科大学附属北京儿童医院急救中心,北京100045

出  处:《实用儿科临床杂志》2009年第6期441-443,共3页Journal of Applied Clinical Pediatrics

基  金:北京市自然科学基金项目资助(7052027)

摘  要:目的观察感染性休克兔胃黏膜与动脉血二氧化碳分压差[p(g-a)(CO2)]的变化。方法日本大耳白兔16只,麻醉后压力控制通气,将动物随机分成休克组和对照组,每组各8只。休克组静脉输注稀释的大肠杆菌内毒素(2 mg/kg)复制感染性休克模型,对照组输入等量9 g/L盐水。多导生理记录仪连续监测平均动脉血压和心率。多普勒超声流量计持续测定心排出量和肠系膜上动脉血流量。气体张力测定法每10分钟测定1次胃黏膜二氧化碳分压。每小时测定Hb水平、动静脉血气分析、动脉血乳酸。结果对照组各参数维持稳定,休克组变化明显。与基础状态比较,休克组兔静脉注射内毒素后2 h,动脉血压由(78±5)mmHg降至(50±2)mmHg(1 mmHg=0.133 kPa)(F=145.3 P<0.01),心脏指数由(201±17)mL/(kg.min)降至(112±11)mL/(kg.min)(F=80.5 P<0.01),肠系膜上动脉血流指数由(20.0±1.0)mL/(kg.min)降至(10.6±1.3)mL/(kg.min)(F=60.0 P<0.05),p(g-a)(CO2)由(11.4±2.8)mmHg升至(57.4±7.1)mmHg(F=120.9 P<0.01)。氧输送则由(31.4±2.9)mL/(kg.min)降至(16.6±2.0)mL/(kg.min)(F=75.5 P<0.01),氧消耗由(11.2±1.8)mL/(kg.min)降至(5.1±0.7)mL/(kg.min)(F=46.4 P<0.01)。休克后2组各参数比较均有显著性差异(Pa<0.01)。结论p(g-a)(CO2)可作为感染性休克兔胃肠低灌注的指标。Objective To observe the change of gastric mucosal - arterial partiaL pressure of carbon dioxide gap [P〈g-a) (CO2) ] in septic shock rabbit. Methods Sixteen anesthetized and mechanically ventilated rabbit were randomly assigned to 2 groups:shock group( n = 8 ) and control group ( n = 8 ). The rabbit in shock group were challenged with intravenous injection of 2 mg/kg Lipopolysaccharides from Escherichia coll. The rabbit in control group were intravenous injection of normal saline solution. Mean arterial pressure(MAP) and heart rate were continuously recorded by muhichannel physiologic recorder. Cardiac index(CI) and superior mesenteric blood flow index(SMBFI) were continuously monitored by doppler flowmeter. Gastric mucosal partial pressure of carbon dioxide [pg ( CO2 ) ] was evaluated by gas tonometry every 10 min. Arterial and venous blood gas analysis, hemoglobin, and Lactate levels were measured every 1 hour. Results The parameters remained stable in control group, but the parameters changed significantly in shock group. Compared with baseline levels, 2 hours after Lipopolysaccharides infusion in shock group, MAP decreased from (78 ±5) mmHg to (50 ±2) mmHg (1 mmHg =0. 133 kPa) (F= 145.3 P〈0. 01),CIdecreasedfrom(201±17) mL/(kg·min) to(112±11) mL/(kg·min)(F=80.5 P〈0.01),SMBFldecreasedfrom (20.0±1.0) mL/(kg.min) to (10.6±1.3) mL/(kg·min)(F=60.0 P〈0.05),P〈0.05)(CO2) increased from (11.4±2.8) mmHg to(57.4±7.1) mmHg(F=120.9 P〈0.01). Oxygen delivery decreased from (31.4±2.9) mL/(kg· min) to (16.6± 2.0) mL/(kg·min) (F=75. 5 P 〈0.01). Oxygen consumption decreased from (11.2±1.8) mL/(kg · min) to (5.1 ± 0.7 ) mL/( kg· min)( F=46.4 P 〈 0.01 ). There were significant differences in every parameter between groups after shock (Pa 〈 0.01 ). Conclusion p(g-a) ( CO2 ) can serve as a indicator of splanchnic hypoperfusion.

关 键 词:感染性休克 胃黏膜二氧化碳分压 气体张力测定法 

分 类 号:R459.7[医药卫生—急诊医学]

 

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