脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

Shenfu injection attenuates neurotoxicity of bupivacaine in cultured mouse spinal cord neurons

Background Our previous in vivo study in the rat demonstrates that Shenfu injection, a clinically used extract preparation from Chinese herbs, attenuates neural and cardiac toxicity induced by intravenous infusion of bupivacaine, a local anesthetic. This study was designed to investigate whether bupivacaine could induce a toxic effect in primary cultured mouse spinal cord neuron and if so, whether the Shenfu injection had a similar neuroprotective effect in the cell model. Methods The spinal cords from 11- to 14-day-old fetal mice were minced and incubated. Cytarabine was added into the medium to inhibit the proliferation of non-neuronal cells. The immunocytochemical staining of β-tubulin was used to determine the identity of cultured cells. The cultured neurons were randomly assigned into three sets treated with various doses of bupivacaine, Shenfu and bupivacaine+Shenfu, for 48 hours respectively. Cell viability in each group was analyzed by methyl thiazoleterazolium (MTT) assay. Results The viability of the cultured neurons treated with bupivacaine at concentrations of 0.01%, 0.02%, 0.04% and 0.08% was decreased in a dose-dependent manner. Although the Shenfu injection at concentrations ranging from 1/50 to 1/12.5 (V/V) had no significant influence on the viability of cultured neurons (P&lt;0.05 vs control), the injection significantly increased the cellular viability of cultured neurons pretreated with 0.03% bupivacaine (P&lt;0.05). Conclusion Although Shenfu injection itself has no effect on spinal neurons, it was able to reduce the bupivacaine- induced neurotoxicity in vitro.     

脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

脂肪乳剂对布比卡因中毒犬的血流动力学及药代动力学的影响

Objective To investigate the effects of [ntralipid injection on hemodynamics and pharmacodynamics of mongrel dogs with bupivacaine-induced cardiac depression. Methods Fourteen dogs were randomly divided into Intralipid injection group (the experiment group) and normal saline group(the control group). 0. 5% bupivacaine was administrated at a constant rate until the mean arterial pressure (MAP) decreased to 60% of the basic value. Intralipid injection was administered in the experiment group. The hemedynamic parameters were recorded and blood samples were taken from femoral artery at 0, 5, 10, 15, 20, 30, 45,60, 90,120, 180,240 min after stopping bupivacaine infusion for determination of plasma concentration by HPLC. The pharmacokinetic parameters were calculated by Drug and Statistics soft version 2. O. Results After the treatment of Intralipid injection, MAP, CO, HR increased significantly, compared min-1 in the experiment group and the control group respectively. Vz (4. 5 ± 1.1 L/kg versus 3. 3 ± 0. 9 L/kg)of bupivacaine in the experiment group was significantly higher than that in the control group(P < 0. 05). Conclusion Intravenous infusion of Intralipid have beneficial effects on the hemodynamics of mongrel dogs with bupivaeaine-induced cardiac depression. One of the mechanism of the beneficial effects was probably that Intralipid injection increases the apparent volume of bupivacaine distribution and that decreases blood concentration.     

丙泊酚对罗哌卡因所致大鼠中枢及心脏毒性的影响

目的探讨丙泊酚对罗哌卡因所致大鼠中枢及心脏毒性的影响。方法 30只雄性SD大鼠随机均分为3组（n=10）,生理盐水组（A组）、丙泊酚Ⅰ组（B组）、丙泊酚Ⅱ组（C组）。实验前5min,A组大鼠股静脉注射生理盐水5ml/kg,B组大鼠股静脉注射0.5%丙泊酚5ml/kg,C组大鼠股静脉注射1%丙泊酚5ml/kg。所有实验动物股静脉置管泵注0.5%罗哌卡因,速度为2.5ml/（kg.min）,并记录大鼠出现抽搐、心律失常和心跳停止的时间及罗哌卡因用量。结果 3组泵入罗哌卡因后均出现抽搐、室性心律失常及心跳停止的中枢及心脏毒性反应。B组、C组出现中枢及心脏毒性反应时的中毒剂量明显大于A组（P〈0.01）。C组出现中枢及心脏毒性反应时的中毒剂量大于B组（P〈0.01）。结论短时间内过量罗哌卡因引起大鼠的中枢及心脏毒性反应,预先给予丙泊酚可明显减轻罗哌卡因对大鼠的中枢及心脏毒性作用。     

参附注射液对新生大鼠缺氧缺血性脑损伤干预作用的实验研究

目的研究参附注射液对新生大鼠缺氧缺血性脑损伤(HIBD)的干预作用。方法建立新生大鼠HIBD模型,把实验分成两部分(1)观察缺氧缺血后3、7、14和28d各组新生大鼠的体重变化以及各组28d内生存率。(2)流式细胞术测量缺氧缺血前2h,缺氧缺血后2h、12h、24h、3d、7d、14d和28d各时间点新生大鼠海马CA1区神经元的凋亡率,每组实验随机分为4组(每组20只)假手术组,生理盐水对照组,参附预处理组,参附治疗组。结果缺氧缺血后3、7、14和28d,生理盐水对照组大鼠体重的增长均明显小于假手术组(7d8.8g±2.1gvs14.0g±2.9g,均P<0.01),且明显小于参附预处理组(7d11.7g±3.3g,P<0.01或P<0.05),缺氧缺血后7、14、28d生理盐水对照组大鼠体重的增长均明显小于参附治疗组(7d10.9g±2.7g,P<0.01或P<0.05)。各组的体重明显小于假手术组。生理盐水对照组存活率为60%(12/20),参附预处理组存活率为90%(18/20),参附治疗组存活率为85%(17/20),生理盐水对照组存活率明显低于其他各组(P<0.05),其余各组存活率差异无统计学意义(均P>0.05)。缺氧缺血后2h生理盐水对照组、参附治疗组、参附预处理组海马神经元凋亡率开始升高,于缺氧缺血后24h凋亡率达到峰值后开始下降,缺氧缺血后14d降到正常。参附治疗组和参附预处理组海马神经元凋亡情况明显好于生理盐水对照组(24h16.0%±4.2%vs11.9%±2.3%vs18.1%,P<0.05或P<0.01)。结论参附注射液减少了新生大鼠缺氧缺血后神经元凋亡的发生,改善了新生大鼠HIBD后的生长发育,提高了其生存率。     

三种方法治疗大鼠布比卡因系统毒性的效果比较

目的 观察三种方法对布比卡因系统毒性的治疗效果,探寻局麻药毒性安全有效的治疗方法.方法 36只雄性SD大鼠随机分为丙泊酚组(P组)、咪唑安定组(M组)和丙泊酚+咪唑安定组(PM组),每组12只.以肢体Ⅱ导联监测心电图(electrocardiogram, ECG),股动脉置入24G套管针监测血压,股静脉置入24G套管针...     

脂肪乳剂预处理对布比卡因心脏毒性的影响

目的研究脂肪乳剂预处理对布比卡因致新西兰大白兔心脏毒性的影响及机制。方法 14只新西兰大白兔随机均分为2组,A组给予乳酸林格液,B组给予脂肪乳注射液20%英脱利匹特预处理,然后微量泵持续输注0.75%布比卡因3mg/(kg.min)至动脉压力波为直线,观察心脏不良事件发生的时间和测量心肌布比卡因的浓度。结果出现室性心律时间B组为(108.1±24.8)s,显著延后于A组[(50.4±10.4)s,P=0.000];心脏完全停搏时间B组为(722.6±191.9)s,显著延后于A组[(347.1±66.2)s,P=0.002];布比卡因的总用量B组为(36.1±9.6)mg/kg,显著高于A组[(17.4±3.3)mg/kg,P=0.002]。A组和B组心肌布比卡因浓度分别为(151.6±197.7)μg/g和(130.7±24.9)μg/g,差异无统计学意义(P=0.109)。结论脂肪乳剂预处理能降低布比卡因的心脏毒性,主要作用机制可能是脂肪池效应。     

Effect of obstructive jaundice on renal Na-K ATPase activity and ATP contents, their response to E. coli or endotoxin and effect of 1-6 fructose diphosphate.

A two-week bile duct ligation (BDL) in Sprague-Dawley (SD) rats raised the serum billirubin level and decreased the mean arterial blood pressure and renal cortical ATP contents compared with those in sham-operated (SO) rats (3.6 +/- 1.15 mg% vs 0.54 +/- 0.36, P less than 0.001; 69 +/- 24 mmHg vs 86 +/- 21, P less than 0.05; 3.72 +/- 0.86 x 10(-10) mol/mg tissue vs 7.27 +/- 0.18, P less than 0.05). No difference could be found in the medullary ATP contents (8.42 +/- 2.20 vs 8.70 +/- 2.80, P = NS). In SO rats, injection of endotoxin (0.7 mg/kg BW) and E. coli (3.1 x 10(5) bacteria/100 g BW) reduced cortical ATP content to 1.86 +/- 0.97 and 1.30 +/- 0.47 (P less than 0.001), and medullar ATP to 1.33 +/- 0.31 and 2.12 +/- 0.46 (P less than 0.001) respectively. In BDL rats, the same treatment led to further decrease in cortical ATP to 1.25 +/- 0.40 and 0.62 +/- 0.20, medullary ATP to 0.97 +/- 0.41 and 1.64 +/- 0.83 (P less than 0.001). Basal Na-K ATPase activity in BDL is the same compared with that in SO both in the cortex (2.85 +/- 2.2 mumol/mgpr/h vs 2.19 +/- 0.75; P = NS) and medulla (2.79 +/- 1.83 vs 3.05 +/- 1.38; P = NS).(ABSTRACT TRUNCATED AT 250 WORDS)

     

游离脂肪酸诱导的胰岛素抵抗对血浆ghrelin水平的影响

目的　探讨正糖 高胰岛素钳夹及游离脂肪酸 (FFA)对大鼠血浆ghrelin浓度的影响。方法　建立清醒状态下大鼠正常血糖 高胰岛素钳夹技术 ,在钳夹前后分别测定大鼠血浆ghrelin浓度 ,脂质灌注组大鼠 12只 ,生理盐水组 12只为对照 ,并用 3 3 H葡萄糖作为示踪剂测定了胰岛素介导的外周和肝糖的代谢。结果　在胰岛素钳夹中 ,脂质灌注组大鼠血浆FFA明显增加 (从 74 2 μmol/L±5 1μmol/L到 2 346 μmol/L± 2 38μmol/L ,P <0 0 1)。脂质灌注组葡萄糖输注率 (GIR)明显低于对照组( 2 0 0 2 4 0min ,平均 12 6mg·kg-1·min-1± 1 5mg·kg-1·min-1vs 34 0mg·kg-1·min-1± 1.6mg·kg-1·min-1,P <0 0 1)。到钳夹结束时 ,下降至相应对照值的 35 % ( 2 4 0min ,12 0mg·kg-1·min-1± 1 9mg·kg-1·min-1vs 34 7mg·kg-1·min-1± 1 7mg·kg-1·min-1,P <0 0 1)。对照组肝糖产率 (HGP)明显被抑制 ( 88% ) ,从 19 0mg·kg-1·min-1± 4 5mg·kg-1·min-1降至 2 3mg·kg-1·min-1± 0 9mg·kg-1·min-1(P <0 0 1)。脂质输注组胰岛素对HGP的抑制作用明显障碍 ( 2 0 0 2 4 0min ,从 18 7mg·kg-1·min-1± 3 0mg·kg-1·min-1到 2 3 2mg·kg-1·min-1± 3 1mg·kg-1·min-1,P <0 0 5 )。钳夹术结束时 ,对照     

Quinaprilat increases total body vascular compliance in rats with myocardial infarction.

To test whether quinaprilat, a new angiotensin converting enzyme inhibitor, has any venous effect, its immediate effects were measured on mean circulatory filling pressure (MCFP), intravascular volume and total body vascular (i.e., venous) compliance in conscious rats with mild congestive heart failure induced by coronary artery ligation. MCFP was determined by inflating a right atrial balloon to arrest the circulation instantly and temporarily. Total body vascular compliance was derived from total circulatory pressure-volume relationships as determined by series measurements of MCFP with different intravascular volume status. In 8 rats with mean infarct size of 26 +/- 4%, 30-minute infusion of quinaprilat (0.1 mg/kg/min) decreased both mean arterial and central venous pressures by 8 mmHg and 0.7 mmHg, respectively (P less than 0.02); heart rate, MCFP, hematocrit and blood volume remained unchanged. Compared with control vehicle infusion, quinaprilat increased the total body vascular compliance (2.09 +/- 0.12 vs 2.69 +/- 0.23 ml/kg/mmHg; P less than 0.05) and decreased extrapolated unstressed circulating volume (34.96 +/- 1.10 vs 28.53 +/- 2.55 ml/kg; P less than 0.02). These data suggest that quinaprilat produces possible venodilation through immediately improved total body vascular compliance thereby reducing cardiac preload in this rat model of chronic heart failure.

     

地塞米松对内毒素致急性肺损伤大鼠肺的保护作用

目的:探讨在急性肺损伤(acute lung injury,ALI)病程不同阶段给予小剂量地塞米松干预,对ALI是否具有保护性差异.方法:根据腹腔注射内毒素(lipopolysacharide,LPS)后不同时间肺组织病理改变程度的不同将实验动物分为LPS组、LPS后1 h地塞米松干预组、LPS后3 h地塞米松干预组和生理盐水对照组,对比各组间组织病理学改变、动脉血气、肺湿/干重比、肺泡灌洗液蛋白含量、肺通透指数、IL-8含量及肺内水通道蛋白1(aquaporin-1,AQP1)表达的差异.结果:LPS组、LPS后1 h组、LPS后3 h组和生理盐水对照组的肺湿/干重比例分别为(4.92±0.23),(4.89±0.21),(4.57±0.14)和(4.48±0.23),肺泡灌洗液蛋白含量分别为(291.60±58.58) g/L,(140.36±32.45)g/L,(121.80±40.68)g/L和(194.6±60.36)g/L,肺通透指数分别为(5.73±1.37),(2.40±0.51),(2.15±0.63)和(3.94±1.28),肺内AQP1表达水平分别为(19.92±6.47),(33.47±9.41),(40.70±9.18)和(47.16±10.88).试验结果显示两组地塞米松干预组与内毒素组相比均可显著改善肺湿/干重比、肺泡灌洗液蛋白含量、肺通透指数及肺内AQP1表达水平,差异具有统计学意义;在LPS后3 h地塞米松干预组上述指标改善趋势更明显,但与LPS后1 h地塞米松干预组结果相比差异不具有统计学意义.上述4组的病理评分分别为(12.00±2.22)分,(6.75±2.28)分,(8.00±2.66)分和(2.75±0.79)分,两组地塞米松干预组与LPS组3组间比较差异无统计学意义.结论:ALI典型病理改变出现后再给予糖皮质激素治疗可以改善肺通透性和减轻肺水肿.     

Higher physiological doses of nandrolone decanoate do not influence the Bezold-Jarish reflex control of bradycardia

BACKGROUND: We investigated the influence of short-term treatment with supraphysiological doses of an anabolic-androgenic steroid on the Bezold-Jarisch reflex (BJR) control of heart rate (HR) and whether this treatment induced cardiac hypertrophy and anabolic effects in rats. METHODS: Male rats were treated with nandrolone decanoate (10 mg/kg(-1) body weight/4 weeks; DECA) or vehicle control (CON). After 4 weeks of treatment, BJR was evaluated by bradycardia responses that were elicited by serotonin administration (2-32 microg/kg(-1)). Mean arterial pressure (MAP) was assessed and cardiac hypertrophy was determined by the left ventricle weight/body weight (LVW/BW) ratio. Histological analyses of LV and the measurement of the total body protein content of the animals were performed. RESULTS: Nandrolone decanoate (ND) treatment had no effect on the MAP (CON=105+/-5; DECA=110+/-3 mmHg). However, the mean basal HR of DECA animals was significantly lower than that of control animals (CON = 381+/-14; DECA=324+/-12 bpm; p<0.01). ND did not change the sensitivity of the BJR. The LVW/BW ratio indicated significant hypertrophy of the LV in DECA animals (CON=1.76+/-0.04; DECA=2.0+/-0.04 mg/g; p<0.01). Histological and morphometrical analyses demonstrate that there is also modest myocyte hypertrophy (CON=14.5+/-1.5; DECA=20.0 +/- 0.9 myocyte nuclei/field; p<0.05). However, the Masson-trichromic-stained samples showed an enhancement of collagen deposits on the LV matrix. CONCLUSIONS: We concluded that 4 weeks ND treatment induced an anabolic effect and the beginnings of LV remodeling, mainly due to excessive collagen deposition in the cardiac extracellular matrix. However, the treatment did not influence BJR control of bradycardia, an effect that could be explained by an enhanced efferent vagal tonus in DECA animals.