目的探索miRNA-223在房颤患者心房肌组织和血清的表达差异及miRNA-223与MMP-9在房颤患者的表达水平及在房颤结构重构的发生机制。方法患有风湿性心瓣膜病接受心脏瓣膜置换术的患者31例,其中窦性心律患者15例,慢性房颤患者16例。另选取1...目的探索miRNA-223在房颤患者心房肌组织和血清的表达差异及miRNA-223与MMP-9在房颤患者的表达水平及在房颤结构重构的发生机制。方法患有风湿性心瓣膜病接受心脏瓣膜置换术的患者31例,其中窦性心律患者15例,慢性房颤患者16例。另选取15名健康人血清作为对照组。实时荧光定量PCR检测心房肌组织和血清miRNA-223的相对表达量。ELISA及免疫组织化学检测MMP-9蛋白的表达及分布水平;HE染色及Masson染色观察心肌组织病理结构及胶原纤维含量。结果与窦性心律组相比,房颤组心房肌组织miRNA-223和血清miRNA-223表达水平均显著升高(0.0603±0.0228 vs.0.0261±0.0035,P<0.01;4.2281±0.9165 vs 2.7613±1.2166,P<0.05);房颤组血清MMP-9表达水平高于窦性心律组(4.2281±0.9165 vs 2.7613±1.2166,P<0.05);MiRNA-223表达水平与MMP-9蛋白表达呈正相关(r=0.901,P<0.05)。结论 MiRNA-223表达增高及正向调控MMP-9的表达,共同影响心肌胶原的代谢,促进心肌纤维化,参与房颤发生与维持。miRNA-223有望成为一种新型风湿性心脏病合并房颤的诊断标志物。展开更多
目的探讨多普勒超声心动图对先天性心脏病(CHD)儿童肺动脉高压(PAH)的诊断价值及PAH对左室重塑和舒张功能(LVDF)的影响。方法对彩色多普勒超声心动图证实的45例继发肺动脉高压的先天性心脏病患儿的超声心动图和多普勒血流资料与22例无PA...目的探讨多普勒超声心动图对先天性心脏病(CHD)儿童肺动脉高压(PAH)的诊断价值及PAH对左室重塑和舒张功能(LVDF)的影响。方法对彩色多普勒超声心动图证实的45例继发肺动脉高压的先天性心脏病患儿的超声心动图和多普勒血流资料与22例无PAH的先天性心脏病患儿(对照组)对比分析。结果PAH组及对照组的左室舒张末内径分别为18.24±1.71mm vs 16.28±0.52mm、右室内径12.23±2.14mm vs 8.14±0.73mm、肺动脉内径11.20±1.35mm vs 7.92±0.21mm。两组比较差异有显著性(P<0.05);VTR流速增快(2.56±0.46)m/s及PASP压力(40.23±4.56)mmHg升高,与对照组相比差异亦有显著性(P<0.05);室间隔增厚与对照组相比差异不明显。对照组、PAH组的二尖瓣口血流多普勒频谱A峰流速分别为94.56±31.45m/s vs 51.17±26.67m/s、A峰流速速度时间积分为10.89±2.73s vs 4.94±1.85s及AV/EV为1.79±0.32 vs 0.59±0.19、AVTI/EVTI为1.61±0.49 vs 0.45±0.21两组比较差异有显著性(P<0.01)。左室等容舒张时间分别为119.86±54.62s vs 52.31±28.06s。PAH组明显延长(P<0.05)。E峰流速、E峰流速速度时间积分及E峰减速时间两组无明显改变(P>0.05)。而增高的肺动脉压与二尖瓣口血流频谱AV/EV比值呈正相关,相关系数r=0.4456,P<0.01。结论多普勒超声心动图不仅是先天性心脏病儿童合并肺动脉高压最重要的诊断方法之一,还可提供肺动脉高压对左室重塑和舒张功能受损的指标,对临床判断病情轻重及预后有重要价值。展开更多
After myocardial infarction(MI), the heart undergoes extensive myocardial remodeling through the accumulation of fibrous tissue in both the infarcted and noninfarcted myocardium, which distorts tissue structure, incre...After myocardial infarction(MI), the heart undergoes extensive myocardial remodeling through the accumulation of fibrous tissue in both the infarcted and noninfarcted myocardium, which distorts tissue structure, increases tissue stiffness, and accounts for ventricular dysfunction. There is growing clinical consensus that exercise training may beneficially alter the course of post-MI myocardial remodeling and improve cardiac function. This review summarizes the present state of knowledge regarding the effect of post-MI exercise training on infarcted hearts. Due to the degree of difficulty to study a viable human heart at both protein and molecular levels, most of the detailed studies have been performed by using animal models. Although there are some negative reports indicating that post-MI exercise may further cause deterioration of the wounded hearts, a growing body of research from both human and animal experiments demonstrates that post-MI exercise may beneficially alter the course of wound healing and improve cardiac function. Furthermore, the improved function is likely due to exercise training-induced mitigation of reninangiotensin-aldosterone system, improved balance between matrix metalloproteinase-1 and tissue inhibitor of matrix metalloproteinase-1, favorable myosin heavy chain isoform switch, diminished oxidative stress, enhanced antioxidant capacity, improved mitochondrial calcium handling, and boosted myocardial angiogenesis. Additionally, meta-analyses revealed that exercise-based cardiac rehabilitation has proven to be effective, and remains one of the least expensive therapies for both the prevention and treatment of cardiovascular disease, and prevents re-infarction.展开更多
目的:通过检测动态血压、内皮细胞合成和分泌的血管活性物质及心脏结构,探讨老年高血压患者血压晨峰与内皮功能、心脏重构的关系。方法:将60例老年高血压患者按血压晨峰程度是否>50 mm Hg分为2组,A组血压晨峰≥50 mm Hg(33例),B组血...目的:通过检测动态血压、内皮细胞合成和分泌的血管活性物质及心脏结构,探讨老年高血压患者血压晨峰与内皮功能、心脏重构的关系。方法:将60例老年高血压患者按血压晨峰程度是否>50 mm Hg分为2组,A组血压晨峰≥50 mm Hg(33例),B组血压晨峰<50 mm Hg(27例)。所有受试者采用硝酸还原酶法,放射免疫法分别测定血清一氧化氮、内皮素含量,并进行超声心动图检查。结果:A组血清一氧化氮含量较B组低(P<0.05),血清内皮素含量较B组高(P<0.05);左心室肥厚发生率,左心房内径增大发生率较B组高(P<0.05)。结论:老年高血压患者血压晨峰程度与内皮功能损伤程度、心脏重构密切相关。展开更多
文摘目的探索miRNA-223在房颤患者心房肌组织和血清的表达差异及miRNA-223与MMP-9在房颤患者的表达水平及在房颤结构重构的发生机制。方法患有风湿性心瓣膜病接受心脏瓣膜置换术的患者31例,其中窦性心律患者15例,慢性房颤患者16例。另选取15名健康人血清作为对照组。实时荧光定量PCR检测心房肌组织和血清miRNA-223的相对表达量。ELISA及免疫组织化学检测MMP-9蛋白的表达及分布水平;HE染色及Masson染色观察心肌组织病理结构及胶原纤维含量。结果与窦性心律组相比,房颤组心房肌组织miRNA-223和血清miRNA-223表达水平均显著升高(0.0603±0.0228 vs.0.0261±0.0035,P<0.01;4.2281±0.9165 vs 2.7613±1.2166,P<0.05);房颤组血清MMP-9表达水平高于窦性心律组(4.2281±0.9165 vs 2.7613±1.2166,P<0.05);MiRNA-223表达水平与MMP-9蛋白表达呈正相关(r=0.901,P<0.05)。结论 MiRNA-223表达增高及正向调控MMP-9的表达,共同影响心肌胶原的代谢,促进心肌纤维化,参与房颤发生与维持。miRNA-223有望成为一种新型风湿性心脏病合并房颤的诊断标志物。
文摘目的探讨多普勒超声心动图对先天性心脏病(CHD)儿童肺动脉高压(PAH)的诊断价值及PAH对左室重塑和舒张功能(LVDF)的影响。方法对彩色多普勒超声心动图证实的45例继发肺动脉高压的先天性心脏病患儿的超声心动图和多普勒血流资料与22例无PAH的先天性心脏病患儿(对照组)对比分析。结果PAH组及对照组的左室舒张末内径分别为18.24±1.71mm vs 16.28±0.52mm、右室内径12.23±2.14mm vs 8.14±0.73mm、肺动脉内径11.20±1.35mm vs 7.92±0.21mm。两组比较差异有显著性(P<0.05);VTR流速增快(2.56±0.46)m/s及PASP压力(40.23±4.56)mmHg升高,与对照组相比差异亦有显著性(P<0.05);室间隔增厚与对照组相比差异不明显。对照组、PAH组的二尖瓣口血流多普勒频谱A峰流速分别为94.56±31.45m/s vs 51.17±26.67m/s、A峰流速速度时间积分为10.89±2.73s vs 4.94±1.85s及AV/EV为1.79±0.32 vs 0.59±0.19、AVTI/EVTI为1.61±0.49 vs 0.45±0.21两组比较差异有显著性(P<0.01)。左室等容舒张时间分别为119.86±54.62s vs 52.31±28.06s。PAH组明显延长(P<0.05)。E峰流速、E峰流速速度时间积分及E峰减速时间两组无明显改变(P>0.05)。而增高的肺动脉压与二尖瓣口血流频谱AV/EV比值呈正相关,相关系数r=0.4456,P<0.01。结论多普勒超声心动图不仅是先天性心脏病儿童合并肺动脉高压最重要的诊断方法之一,还可提供肺动脉高压对左室重塑和舒张功能受损的指标,对临床判断病情轻重及预后有重要价值。
文摘After myocardial infarction(MI), the heart undergoes extensive myocardial remodeling through the accumulation of fibrous tissue in both the infarcted and noninfarcted myocardium, which distorts tissue structure, increases tissue stiffness, and accounts for ventricular dysfunction. There is growing clinical consensus that exercise training may beneficially alter the course of post-MI myocardial remodeling and improve cardiac function. This review summarizes the present state of knowledge regarding the effect of post-MI exercise training on infarcted hearts. Due to the degree of difficulty to study a viable human heart at both protein and molecular levels, most of the detailed studies have been performed by using animal models. Although there are some negative reports indicating that post-MI exercise may further cause deterioration of the wounded hearts, a growing body of research from both human and animal experiments demonstrates that post-MI exercise may beneficially alter the course of wound healing and improve cardiac function. Furthermore, the improved function is likely due to exercise training-induced mitigation of reninangiotensin-aldosterone system, improved balance between matrix metalloproteinase-1 and tissue inhibitor of matrix metalloproteinase-1, favorable myosin heavy chain isoform switch, diminished oxidative stress, enhanced antioxidant capacity, improved mitochondrial calcium handling, and boosted myocardial angiogenesis. Additionally, meta-analyses revealed that exercise-based cardiac rehabilitation has proven to be effective, and remains one of the least expensive therapies for both the prevention and treatment of cardiovascular disease, and prevents re-infarction.
文摘目的:通过检测动态血压、内皮细胞合成和分泌的血管活性物质及心脏结构,探讨老年高血压患者血压晨峰与内皮功能、心脏重构的关系。方法:将60例老年高血压患者按血压晨峰程度是否>50 mm Hg分为2组,A组血压晨峰≥50 mm Hg(33例),B组血压晨峰<50 mm Hg(27例)。所有受试者采用硝酸还原酶法,放射免疫法分别测定血清一氧化氮、内皮素含量,并进行超声心动图检查。结果:A组血清一氧化氮含量较B组低(P<0.05),血清内皮素含量较B组高(P<0.05);左心室肥厚发生率,左心房内径增大发生率较B组高(P<0.05)。结论:老年高血压患者血压晨峰程度与内皮功能损伤程度、心脏重构密切相关。
