目的应用二维斑点追踪显像(2D-STI)技术获取可疑非ST段抬高性急性冠状动脉综合征(NSTE-ACS)患者左心室区域及整体纵向分层应变,探讨分层应变参数预测冠状动脉显著狭窄的价值。方法选取2016年9月至2017年1月苏北人民医院收治的疑诊NSTE-...目的应用二维斑点追踪显像(2D-STI)技术获取可疑非ST段抬高性急性冠状动脉综合征(NSTE-ACS)患者左心室区域及整体纵向分层应变,探讨分层应变参数预测冠状动脉显著狭窄的价值。方法选取2016年9月至2017年1月苏北人民医院收治的疑诊NSTE-ACS的患者75例,所有患者均行冠状动脉造影,其中,对照组(冠状动脉无狭窄或狭窄率<50%)24例,冠状动脉粥样硬化性心脏病(简称冠心病)组51例。冠心病组患者根据冠状动脉是否闭塞分为冠状动脉狭窄组32例,冠状动脉闭塞组19例。应用Echo PAC软件分析二维动态图像获得左心室18节段收缩期纵向分层应变,计算心内膜下心肌、中层心肌及心外膜下心肌区域纵向应变(TLSendo、TLSmid、TLSepi)及左心室心内膜下心肌、中层心肌、心外膜下心肌整体纵向应变(GLSendo、GLSmid、GLSepi)。采用单因素方差分析比较3组患者左心室区域及整体心肌纵向分层应变参数差异,进一步组间两两比较采用LSD-t检验。以冠状动脉造影结果作为诊断冠状动脉明显狭窄(狭窄率≥50%)即冠心病的金标准,绘制不同参数预测冠状动脉明显狭窄的受试者工作特征(ROC)曲线。结果与对照组、冠状动脉狭窄组患者比较,冠状动脉闭塞组患者TLSendo、TLSmid、TLSepi及GLSendo、GLSmid、GLSepi均减低,且差异均有统计学意义(冠状动脉闭塞组vs对照组:t值分别为-5.819、-5.049、-4.845、-5.955、-5.036、-4.724,P均<0.01;冠状动脉闭塞组vs冠状动脉狭窄组:t值分别为-2.983、-3.059、-2.903、-2.989、-3.192、-3.387,P均<0.01);与对照组患者比较,冠状动脉狭窄组患者仅TLSendo及GLSendo减低,且差异均有统计学意义(t值分别为-3.981、-4.164,P均<0.01);对照组、冠状动脉狭窄组、冠状动脉闭塞组患者TLSendo、TLSmid、TLSepi及GLSendo、GLSmid、GLSepi均呈梯度递减,但仅对照组患者3层间两两比较差异有统计学意义(TLSepi vs TLSendo、GLSepi vs GLSendo:t�展开更多
We studied the effect of growth on wood anatomical dimensions and specific gravity of seed-raised plantation wood of Dalbergia sissoo with twelve trees of different diameters and similar ages. Fiber length ranged from...We studied the effect of growth on wood anatomical dimensions and specific gravity of seed-raised plantation wood of Dalbergia sissoo with twelve trees of different diameters and similar ages. Fiber length ranged from 925 to1,287 lm, fiber-diameter was 19–23 lm, wall thickness was4.2–5.4 lm, vessel-element-length was 152–188 lm, vesselelement-diameter was 152–200 lm, and specific gravity was0.59–0.72. Growth parameters including tree height, diameter at breast height, net primary productivity and net ecosystem productivity were significantly and positively correlated.Growth parameters showed non-significant positive relationships with fiber-length, fiber diameter, wall thickness, vessel element length, and vessel element diameter. The trend of wood traits increased with growth. Specific gravity showed non-significant negative relationships with growth parameters. Although the growth rate had varied relationships with wood properties, as reported by various workers, the wood element dimensions showed no significant relationship with growth parameters and there was little effect of growth rate on wood traits in seed-raised plantation of D. sissoo.展开更多
文摘目的应用二维斑点追踪显像(2D-STI)技术获取可疑非ST段抬高性急性冠状动脉综合征(NSTE-ACS)患者左心室区域及整体纵向分层应变,探讨分层应变参数预测冠状动脉显著狭窄的价值。方法选取2016年9月至2017年1月苏北人民医院收治的疑诊NSTE-ACS的患者75例,所有患者均行冠状动脉造影,其中,对照组(冠状动脉无狭窄或狭窄率<50%)24例,冠状动脉粥样硬化性心脏病(简称冠心病)组51例。冠心病组患者根据冠状动脉是否闭塞分为冠状动脉狭窄组32例,冠状动脉闭塞组19例。应用Echo PAC软件分析二维动态图像获得左心室18节段收缩期纵向分层应变,计算心内膜下心肌、中层心肌及心外膜下心肌区域纵向应变(TLSendo、TLSmid、TLSepi)及左心室心内膜下心肌、中层心肌、心外膜下心肌整体纵向应变(GLSendo、GLSmid、GLSepi)。采用单因素方差分析比较3组患者左心室区域及整体心肌纵向分层应变参数差异,进一步组间两两比较采用LSD-t检验。以冠状动脉造影结果作为诊断冠状动脉明显狭窄(狭窄率≥50%)即冠心病的金标准,绘制不同参数预测冠状动脉明显狭窄的受试者工作特征(ROC)曲线。结果与对照组、冠状动脉狭窄组患者比较,冠状动脉闭塞组患者TLSendo、TLSmid、TLSepi及GLSendo、GLSmid、GLSepi均减低,且差异均有统计学意义(冠状动脉闭塞组vs对照组:t值分别为-5.819、-5.049、-4.845、-5.955、-5.036、-4.724,P均<0.01;冠状动脉闭塞组vs冠状动脉狭窄组:t值分别为-2.983、-3.059、-2.903、-2.989、-3.192、-3.387,P均<0.01);与对照组患者比较,冠状动脉狭窄组患者仅TLSendo及GLSendo减低,且差异均有统计学意义(t值分别为-3.981、-4.164,P均<0.01);对照组、冠状动脉狭窄组、冠状动脉闭塞组患者TLSendo、TLSmid、TLSepi及GLSendo、GLSmid、GLSepi均呈梯度递减,但仅对照组患者3层间两两比较差异有统计学意义(TLSepi vs TLSendo、GLSepi vs GLSendo:t�
文摘We studied the effect of growth on wood anatomical dimensions and specific gravity of seed-raised plantation wood of Dalbergia sissoo with twelve trees of different diameters and similar ages. Fiber length ranged from 925 to1,287 lm, fiber-diameter was 19–23 lm, wall thickness was4.2–5.4 lm, vessel-element-length was 152–188 lm, vesselelement-diameter was 152–200 lm, and specific gravity was0.59–0.72. Growth parameters including tree height, diameter at breast height, net primary productivity and net ecosystem productivity were significantly and positively correlated.Growth parameters showed non-significant positive relationships with fiber-length, fiber diameter, wall thickness, vessel element length, and vessel element diameter. The trend of wood traits increased with growth. Specific gravity showed non-significant negative relationships with growth parameters. Although the growth rate had varied relationships with wood properties, as reported by various workers, the wood element dimensions showed no significant relationship with growth parameters and there was little effect of growth rate on wood traits in seed-raised plantation of D. sissoo.
