血管紧张素(1-7)和依那普利拉对烧伤血清离体灌注大鼠心脏功能的影响

Objective To investigate effects of angiotcnsin ( 1-7 ) [ Ang( 1-7 ) ] and enalaprilat on function of isolated rat heart perfused by burn serum. Methods Eighty SD rats were used to prepare burn serum. Hearts of another 24 SD rats were isolated to reproduce Langendorff perfusion model. The rat hearts were divided into different groups with different perfusion fluids as K-H buffer group, K-H buffer containing 20% burn serum group ( burn serum group) , K-H buffer containing 20% burn serum and 2 μg/mL enala-prilat group (enalaprilat group), and K-H buffer containing 20% burn serum and 1 nmol/mL Ang(1-7) group [ Ang(1-7) group]. The rat hearts were perfused for 30 mins with each of above-mentioned fluids in different groups. Then left ventrieular systolic pressure (LVSP) , left ventricular end diastolic pressure ( LV-EDP) , ± dp/dt max, coronary flow(CF) , level of creatine kinase (CK) and lactate dehydrogenase (LDH) in respective coronary effluent were determined. Results Compared with LVSP ( 11.2 ± 1.0 kPa, 1 kPa = 7.5 mm Hg), +dp/dt max (642±53 kPa/s), -dp/dt max (380±61 kPa/s) and CF level in K-H buffer group, CF, LVSP(5.9±0.8, 8.0±1.1, 8.9±1.3 kPa, respectively), +dp/dt max(275±37, 454±48, 479±63 kPa/s, respectively), - dp/dt max ( 135±35, 219±47, 277±58 kPa/s, respectively ) of burn serum group, those levels in Ang(1-7) group, and enalaprilat group were decreased obviously(P<0.05 or P <0.01 ), but LVEDP, level of CK and LDH in coronary effluent were increased. Compared with those parameters in burn serum group, CF, LVSP, ±dp/dt max of Ang(1-7) group and enalaprilat group were increased obviously(P<0.05 or P<0.01), and LVEDP, level of CK and LDH in coronary effluent were decreased obviously(P<0.01). Conclusions Ang(1-7) and enalaprilat can effectively improve left ventricular function of isolated rat heart perfused by burn serum and mitigate myocardial injury.     

"休克心"对严重烫伤大鼠早期肝肾肠损害的启动作用

目的 了解"休克心"对严重烫伤大鼠早期肝、肾、肠损害是否具有启动作用.方法 将56只Wistar大鼠随机分为对照组(8只),不予烫伤;烫伤组(48只),大鼠背部造成30%TBSA Ⅲ度烫伤,设伤后0.5、1.0、3.0、6.0、12.0和24.0 h观察时相点,每时相点8只大鼠.伤后30 min按Park-land公式腹腔注射乳酸林格液(4 mL·kg-1·1%TBSA-1).检测大鼠肝、肾、肠血流量;动脉收缩压(SBP)、动脉舒张压(DBP)、平均动脉压(MAP)、左心室收缩压(LVSP)、左心室舒张末期压(LVEDP)、左心室压力最大上升/下降速率(±dp/dt max);抽取各组大鼠静脉血检测其血清心肌肌钙蛋白I(cTnI)、总胆汁酸(TBA)、β2微球蛋白(β2-MG)、二胺氧化酶(DAO)含量.结果 伤后1.0 h烫伤组大鼠肝、肾、肠血流量均明显降低.伤后12.0 h内均呈持续下降趋势,至伤后24.0 h仍显著低于对照组(P＜0.05或P＜0.01).烫伤组大鼠伤后1.0 h,LVSP和±dp/dt max即明显下降;伤后3.0 h,SBP、DBP、MAP明显下降;伤后6.0 h所有心脏功能指标均降低,至伤后24.0 h仍低于对照组(P＜0.01).与对照组[(1.71±0.07)μg/L]比较,伤后0.5 h烫伤组大鼠血清cTnI[(2.22±0.08)μg/L]即明显升高,伤后12.0 h[(7.07±0.44)μg/L]达峰值,伤后24.0 h[(4.57±0.30)μg/L]仍保持在较高水平(P＜0.01);伤后3.0 h血清TBA及伤后1.0 h血清β2-MG、DAO开始明显升高,并超过对照组(P＜0.05或P＜0.01),至伤后12.0 h仍呈上升趋势.结论 严重烫伤后心肌损害在时间上明显早于其他脏器,且与其他脏器损害指标和血流量呈显著相关,提示"休克心"可能是严重烫伤后早期肝、肾、肠血流量减少和损害的启动因素之一,但还需深入研究以进一步证明.     

模拟海上颠簸刺激加重严重烧伤家兔休克的研究

目的 了解模拟海上颠簸刺激对烧伤家兔休克的影响. 方法将132只家兔随机分为正常对照组(6只)、单纯颠簸组(行持续颠簸刺激,42只)、单纯烧伤组(行烧伤处理,42只)、烧伤颠簸组(烧伤后即刻进行持续颠簸刺激,42只).后3组家兔于处理后2、6、8、12、24、36、48 h经颈动脉取血,检测血清肌酐(Cr)、血清尿素氮(BUN)、血细胞比容(HCT)和血清乳酸(LA)水平,并取肾脏组织观察其病理学变化,同时留置导尿管持续监测家兔处理后第1、2个24 h的尿量变化;正常对照组家兔亦行上述检测. 结果烧伤颠簸组家兔血Cr、血BUN自处理后24 h起明显高于单纯烧伤组(P<0.01),血LA、HCT各时相点均显著高于单纯烧伤组(P<0.01).烧伤颠簸组家兔肾小球毛细血管和间质血管充血,肾小管上皮细胞肿胀,肾小管炎性细胞浸润及红细胞管型.单纯烧伤组病理变化轻于烧伤颠簸组.单纯烧伤组家兔处理后第1、2个24 h尿量分别为(2.59±0.23)、(2.86±0.29)mL/ h,烧伤颠簸组上述时相点尿量分别为(1.61±0.13)、(1.66±0.16)mL/h,均明显低于正常对照组[(6.06±0.18)mL/h,P<0.01]. 结论模拟海上颠簸刺激,可明显加重严重烧伤家兔休克及肾脏损害.     

血管紧张素(1-7)和依那普利拉对烧伤血清离体灌注大鼠心脏功能的影响

Objective To investigate effects of angiotcnsin ( 1-7 ) [ Ang( 1-7 ) ] and enalaprilat on function of isolated rat heart perfused by burn serum. Methods Eighty SD rats were used to prepare burn serum. Hearts of another 24 SD rats were isolated to reproduce Langendorff perfusion model. The rat hearts were divided into different groups with different perfusion fluids as K-H buffer group, K-H buffer containing 20% burn serum group ( burn serum group) , K-H buffer containing 20% burn serum and 2 μg/mL enala-prilat group (enalaprilat group), and K-H buffer containing 20% burn serum and 1 nmol/mL Ang(1-7) group [ Ang(1-7) group]. The rat hearts were perfused for 30 mins with each of above-mentioned fluids in different groups. Then left ventrieular systolic pressure (LVSP) , left ventricular end diastolic pressure ( LV-EDP) , ± dp/dt max, coronary flow(CF) , level of creatine kinase (CK) and lactate dehydrogenase (LDH) in respective coronary effluent were determined. Results Compared with LVSP ( 11.2 ± 1.0 kPa, 1 kPa = 7.5 mm Hg), +dp/dt max (642±53 kPa/s), -dp/dt max (380±61 kPa/s) and CF level in K-H buffer group, CF, LVSP(5.9±0.8, 8.0±1.1, 8.9±1.3 kPa, respectively), +dp/dt max(275±37, 454±48, 479±63 kPa/s, respectively), - dp/dt max ( 135±35, 219±47, 277±58 kPa/s, respectively ) of burn serum group, those levels in Ang(1-7) group, and enalaprilat group were decreased obviously(P<0.05 or P <0.01 ), but LVEDP, level of CK and LDH in coronary effluent were increased. Compared with those parameters in burn serum group, CF, LVSP, ±dp/dt max of Ang(1-7) group and enalaprilat group were increased obviously(P<0.05 or P<0.01), and LVEDP, level of CK and LDH in coronary effluent were decreased obviously(P<0.01). Conclusions Ang(1-7) and enalaprilat can effectively improve left ventricular function of isolated rat heart perfused by burn serum and mitigate myocardial injury.     

血管紧张素(1-7)和依那普利拉对烧伤血清离体灌注大鼠心脏功能的影响

目的 了解血管紧张素(1-7)[Ang(1-7)]和依那普利托对烧伤血清离体灌注大鼠心脏功能的影响.方法 选取80只SD大鼠制备烧伤血清.另取24只SD大鼠心脏建立Langendofff离体灌注模型.根据灌注液不同,将大鼠心脏分为K-H液组、含体积分数20%烧伤血清的K-H液组(烧伤血清组)、含体积分数20%烧伤血清和2μg/mL依那普利拉的K-H液组(依那普利托组)、含体积分数20%烧伤血清和1 nmoL/mL Ang(1-7)的K-H液组[Ang(1-7)组].各组大鼠心脏连续灌注30min上述溶液后,检测其左心室收缩压(LVSP)、左心室舒张末期压(LVEDP)、左心室压力最大上升/下降速率(±dp/dt max),以及冠状动脉血流量(CF)和冠状动脉流出液中肌酸激酶(CK)、乳酸脱氢酶(LDH)的含量.结果 与K-H液组LVSP[(11.2±1.0)kPa,1 kPa=7.5 mm Hg]、+dp/dt max[(642±53)kPa/s]、-dp/dt max[(380±61)kPa/s]及CF值比较,烧伤血清组、依那普利拉组和Ang(1.7)组LVSP[(5.9±0.8)、(8.0±1.1)、(8.9±1.3)kPa]、+dp/dt max[(275±37)、(454±48)、(479±63)kPa/s]、-dp/dt max[(135±35)、(219±47)、(277±58)kPa/s]及CF值均明显降低(P<0.05或P<0.01),LVEDP和冠状动脉流出液中CK、LDH的含量升高.与烧伤血清组比较,依那普利拉组和Ang(1-7)组CF、LVSP及±dp/dt max均明显升高(P<0.05或P<0.01),LVEDP和冠状动脉流出液中CK、LDH的含量明显降低(P<0.01).结论 Ang(1-7)和依那普利拉均能有效改善烧伤血清离体灌注大鼠左心功能,减轻心肌损伤.     

血管紧张素(1-7)和依那普利拉对烧伤血清离体灌注大鼠心脏功能的影响

Objective To investigate effects of angiotcnsin ( 1-7 ) [ Ang( 1-7 ) ] and enalaprilat on function of isolated rat heart perfused by burn serum. Methods Eighty SD rats were used to prepare burn serum. Hearts of another 24 SD rats were isolated to reproduce Langendorff perfusion model. The rat hearts were divided into different groups with different perfusion fluids as K-H buffer group, K-H buffer containing 20% burn serum group ( burn serum group) , K-H buffer containing 20% burn serum and 2 μg/mL enala-prilat group (enalaprilat group), and K-H buffer containing 20% burn serum and 1 nmol/mL Ang(1-7) group [ Ang(1-7) group]. The rat hearts were perfused for 30 mins with each of above-mentioned fluids in different groups. Then left ventrieular systolic pressure (LVSP) , left ventricular end diastolic pressure ( LV-EDP) , ± dp/dt max, coronary flow(CF) , level of creatine kinase (CK) and lactate dehydrogenase (LDH) in respective coronary effluent were determined. Results Compared with LVSP ( 11.2 ± 1.0 kPa, 1 kPa = 7.5 mm Hg), +dp/dt max (642±53 kPa/s), -dp/dt max (380±61 kPa/s) and CF level in K-H buffer group, CF, LVSP(5.9±0.8, 8.0±1.1, 8.9±1.3 kPa, respectively), +dp/dt max(275±37, 454±48, 479±63 kPa/s, respectively), - dp/dt max ( 135±35, 219±47, 277±58 kPa/s, respectively ) of burn serum group, those levels in Ang(1-7) group, and enalaprilat group were decreased obviously(P<0.05 or P <0.01 ), but LVEDP, level of CK and LDH in coronary effluent were increased. Compared with those parameters in burn serum group, CF, LVSP, ±dp/dt max of Ang(1-7) group and enalaprilat group were increased obviously(P<0.05 or P<0.01), and LVEDP, level of CK and LDH in coronary effluent were decreased obviously(P<0.01). Conclusions Ang(1-7) and enalaprilat can effectively improve left ventricular function of isolated rat heart perfused by burn serum and mitigate myocardial injury.     

血管紧张素(1-7)和依那普利拉对烧伤血清离体灌注大鼠心脏功能的影响

Objective To investigate effects of angiotcnsin ( 1-7 ) [ Ang( 1-7 ) ] and enalaprilat on function of isolated rat heart perfused by burn serum. Methods Eighty SD rats were used to prepare burn serum. Hearts of another 24 SD rats were isolated to reproduce Langendorff perfusion model. The rat hearts were divided into different groups with different perfusion fluids as K-H buffer group, K-H buffer containing 20% burn serum group ( burn serum group) , K-H buffer containing 20% burn serum and 2 μg/mL enala-prilat group (enalaprilat group), and K-H buffer containing 20% burn serum and 1 nmol/mL Ang(1-7) group [ Ang(1-7) group]. The rat hearts were perfused for 30 mins with each of above-mentioned fluids in different groups. Then left ventrieular systolic pressure (LVSP) , left ventricular end diastolic pressure ( LV-EDP) , ± dp/dt max, coronary flow(CF) , level of creatine kinase (CK) and lactate dehydrogenase (LDH) in respective coronary effluent were determined. Results Compared with LVSP ( 11.2 ± 1.0 kPa, 1 kPa = 7.5 mm Hg), +dp/dt max (642±53 kPa/s), -dp/dt max (380±61 kPa/s) and CF level in K-H buffer group, CF, LVSP(5.9±0.8, 8.0±1.1, 8.9±1.3 kPa, respectively), +dp/dt max(275±37, 454±48, 479±63 kPa/s, respectively), - dp/dt max ( 135±35, 219±47, 277±58 kPa/s, respectively ) of burn serum group, those levels in Ang(1-7) group, and enalaprilat group were decreased obviously(P<0.05 or P <0.01 ), but LVEDP, level of CK and LDH in coronary effluent were increased. Compared with those parameters in burn serum group, CF, LVSP, ±dp/dt max of Ang(1-7) group and enalaprilat group were increased obviously(P<0.05 or P<0.01), and LVEDP, level of CK and LDH in coronary effluent were decreased obviously(P<0.01). Conclusions Ang(1-7) and enalaprilat can effectively improve left ventricular function of isolated rat heart perfused by burn serum and mitigate myocardial injury.     

依那普利拉对严重烫伤大鼠早期心肌力学的影响

目的 了解依那普利拉对严重烫伤大鼠早期心肌力学的影响.方法 将84只SD大鼠背部造成30%TBSA的Ⅲ度烫伤后,随机分为烫伤组,伤后按Parkland公式腹腔注射等渗盐水;小剂量治疗组、中剂量治疗组、大剂量治疗组,伤后即刻分别腹腔注射1、2、4 mg/kg依那普利拉.烫伤组、小剂量治疗组伤后1、3、6、12、24 h,中剂量治疗组、大剂量治疗组伤后6、12 h左心室置管检测大鼠左心室收缩压(LVSP)、左心室舒张末期压(LVEDP)、左心室压力最大上升/下降速率(±dp/dt max),并处死大鼠取心肌组织检测血管紧张素Ⅱ(AⅡ)含量.另取6只大鼠作为假伤组,模拟烫伤后检测以上指标.结果 伤后3～24 h,烫伤组及各剂量治疗组大鼠LVSP、LVEDP、±dp/dt max值普遍低于假伤组(P＜0.05或P＜0.01);而各剂量治疗组LVSP、LVEDP、±dp/dt max值普遍高于烫伤组(P＜0.05或P＜0.01);伤后6、12 h,大剂量治疗组±dp/dt max明显低于小、中剂量治疗组.伤后1 h,烫伤组心肌组织AⅡ含量[(53.0±2.6)pg/200 mg]明显高于假伤组[(14.8±0.7)pg/200 mg,P＜0.01],6 h达高峰,以后逐渐下降,伤后24 h仍明显高于假伤组(P＜0.01);伤后3～24 h.小剂量治疗组AⅡ含量均明显高于假伤组(P＜0.05或P＜0.01),但均低于烫伤组.伤后6 h烫伤组AⅡ含量为(145.2±14.5)pg/200 mg,高于小、中、大剂量治疗组[(65.1±0.9)、(53.6±1.1)、(34.2±0.9)pg/200 mg,P ＜0.01].结论 严重烫伤后早期心肌组织损害明显.心功能即明显下降,依那普利托注射液可以改善心肌力学指标、保护心功能,以小剂量效果最为明显.     

依那普利拉减轻大鼠烧伤早期脏器损害的研究

目的 探讨依那普利拉对烧伤早期内脏损害保护作用的量效关系.方法 随机将54只SD大鼠分为烫伤组(B组)和烫伤后小剂量、中剂量和大剂量依那普利拉治疗组(E1、E2、E3组),每组12只大鼠,另取6只大鼠不致伤作为正常对照组.检测烫伤前及伤后6 h和12 h动脉血压、血管紧张素Ⅱ、尿素氮(Bun)、肌酐(Cr)和肌酸激酶(CK)、丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST),以及主要脏器组织病理变化.结果 B组血管紧张素Ⅱ明显升高,治疗组均明显低于B组(P均＜0.05),E2和E3组明显低于E1组;B组大鼠CK、Bun、Cr、ALT、AST均显著高于正常参考值(P均＜0.05),治疗组较B组不同程度降低,E1组下降明显(P＜0.05),各时相点基本与正常值接近;E2和E3组下降不明显,明显高于E1组;烫伤后各组动脉收缩压和舒张压均有不同程度下降,其中E2、E3组较E1组更明显,E1组较B组明显升高.结论 小剂量依那普利拉能够显著减轻严重烧伤后脏器损害的程度,但对动脉收缩压和舒张压无显著影响.     

血管紧张素(1-7)和依那普利拉对烧伤血清离体灌注大鼠心脏功能的影响

Objective To investigate effects of angiotcnsin ( 1-7 ) [ Ang( 1-7 ) ] and enalaprilat on function of isolated rat heart perfused by burn serum. Methods Eighty SD rats were used to prepare burn serum. Hearts of another 24 SD rats were isolated to reproduce Langendorff perfusion model. The rat hearts were divided into different groups with different perfusion fluids as K-H buffer group, K-H buffer containing 20% burn serum group ( burn serum group) , K-H buffer containing 20% burn serum and 2 μg/mL enala-prilat group (enalaprilat group), and K-H buffer containing 20% burn serum and 1 nmol/mL Ang(1-7) group [ Ang(1-7) group]. The rat hearts were perfused for 30 mins with each of above-mentioned fluids in different groups. Then left ventrieular systolic pressure (LVSP) , left ventricular end diastolic pressure ( LV-EDP) , ± dp/dt max, coronary flow(CF) , level of creatine kinase (CK) and lactate dehydrogenase (LDH) in respective coronary effluent were determined. Results Compared with LVSP ( 11.2 ± 1.0 kPa, 1 kPa = 7.5 mm Hg), +dp/dt max (642±53 kPa/s), -dp/dt max (380±61 kPa/s) and CF level in K-H buffer group, CF, LVSP(5.9±0.8, 8.0±1.1, 8.9±1.3 kPa, respectively), +dp/dt max(275±37, 454±48, 479±63 kPa/s, respectively), - dp/dt max ( 135±35, 219±47, 277±58 kPa/s, respectively ) of burn serum group, those levels in Ang(1-7) group, and enalaprilat group were decreased obviously(P<0.05 or P <0.01 ), but LVEDP, level of CK and LDH in coronary effluent were increased. Compared with those parameters in burn serum group, CF, LVSP, ±dp/dt max of Ang(1-7) group and enalaprilat group were increased obviously(P<0.05 or P<0.01), and LVEDP, level of CK and LDH in coronary effluent were decreased obviously(P<0.01). Conclusions Ang(1-7) and enalaprilat can effectively improve left ventricular function of isolated rat heart perfused by burn serum and mitigate myocardial injury.