声学密度定量技术评价病毒性心肌炎

目的探讨心肌背向散射积分 ( IBS)参数评价病毒性心肌炎的临床价值。方法　应用背向散射联机分析技术观测 2 0例病毒性心肌炎患者及 30例正常人的室间隔 ( IVS)、左心室后壁 ( L VPW)的标化平均背向散射积分 ( IB%)、背向散射积分周期变化幅度( CVIB)及室壁增厚率 ( WT%)。结果　病毒性心肌炎患者 IVS和 LVPW的 IB%较正常人明显增加 ,而 CVIB及 WT%则显著减小 ( P<0 .0 5 ) ;CVIB和 WT%呈一定程度相关 ( r=0 .79)。结论　 IBS参数能反映病毒性心肌炎的病理改变 ,是一种有价值的诊断方法。     

急性心肌梗死超急性期的超声诊断

目的 研究急性心肌梗死(AMI)超急性期时的心肌组织超声背向散射积分(IBS)的变化及对临床诊断AMI超急性期的价值.方法 将72例AMI患者分成2组:超急性期组(梗死时间在2 h以内)30例,急性期组42例(梗死时间>2 h,有典型的心电图改变);另取正常对照组30例.用HP-5500型超声诊断仪,分别测量心肌梗死区域和非梗死区域心肌组织的心动周期时间平均背向散射积分(IBS),并将其与心包IBS的比值作为心肌IBS的校正值(IB%),舒张末期与收缩末期的IBS差值即IBS的周期变化幅度(CVIB),并将其与心包IBS的比值作为心肌CVIB的校正值(CVIB%).同时作心电图的比较对照.结果 当AMI超急性期组患者心电图还无典型变化时,心肌梗死部位的IBS值已明显大于正常人[(18.8±3.4)dB比(8.3±1.2)dB,P<0.01],而CVIB明显小于正常人[(6.3 ±0.7)dB比(7.6±1.1)dB,P<0.01].急性期组患者,其IBS明显高于正常人及患者本身非心肌梗死部位[(22.2±4.1)dB比(8.3±1.2)dB,(21.1±3.2)dB比(8.7 ±0.9)dB,P<0.01],而CVIB则明显低于正常人及患者本身非心肌梗死部位[(5.6±0.8)dB比(7.6±1.1)dB,P<0.05;(5.8±0.7)dB比(9.3±0.9)dB,P<0.01].且与心电图的变化完全一致.结论 心肌组织背向散射积分对临床上诊断AMI超急性期有很高的价值,并可判断病变心肌的范围和功能状况.     

血清脂联素对高血压患者心肌背向散射积分和左室心肌质量的影响

目的探讨血清脂联素(APN)对高血压患者心肌背向散射积分和左室心肌质量的影响。方法高血压患者88例为高血压组,健康体检者80例为对照组,取空腹肘静脉血测定葡萄糖(GLU)、甘油三酯(TG)、胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C),采用放射免疫法取血浆测定APN水平及超敏C反应蛋白(hs-CRP),HP Sonos 5500型超声诊断仪测定背向散射积分(IBS)周期变化幅度(CVIB),并计算平均CVIB(ACVIB)。利用脉冲多普勒超声心动图,测定左室功能相关指标。结果与对照组比较,高血压组APN水平明显降低,hs-CRP水平明显升高(均P<0.01);与对照组比较,高血压组二尖瓣口峰值流速(E/A)、舒张早晚期运动速度(Ea)、舒张晚期运动速度(Ea/Aa)、舒张早期左室内血流传播速度(Vp)、ACVIB值显著降低,E峰下降时间(DT)、等容舒张时间(IVRT)显著增大(P<0.05);高血压患者E/A、DT、IVRT、Ea、Ea/Aa、Vp与左室心肌ACVIB的变化呈高度相关性(P<0.05)。结论 APN可作为评价高血压患者的重要检测指标;ACVIB的降低与心肌功能的减退密切相关,观察左室心肌ACVIB的变化,可用于评估高血压患者的左室功能。     

背向散射技术与彩色室壁运动技术在高血压左室重构中的应用

目的探讨背向散射和彩色室壁运动参数评估原发性高血压不同左室构型心肌病变程度和局部室壁运动的临床价值.方法测定70例原发性高血压病患者和31例正常对照者室间隔及左室后壁的背向散射参数和局部室壁收缩期位移.共收入正常构型组18例,向心重构组17例,向心肥厚组23例,离心肥厚组12例.结果高血压各组室间隔超声背向散射(IB%)均不同程度地增大,以向心性肥厚组和离心性肥厚组为著;左室后壁IB%在向心性肥厚组和离心性肥厚组增高,以离心性肥厚组为著;室间隔周期变化幅度(CVIB)在向心性肥厚组和离心性肥厚组减低;左室后壁的CVIB在离心性肥厚组显著减低;高血压各组均未出现明显的背向散射跨壁梯度的改变.室间隔和左室后壁的SEM在离心性肥厚组显著减低,其余各组间虽无明显统计学差异,但在向心性肥厚组呈现增加的趋势.在离心性肥厚组,收缩期CK色带变薄或消失,色带不完整.结论心肌超声背向散射参数可用于判断高血压不同左室构型心肌病变的程度;彩色室壁运动技术可用于评估高血压不同左室构型局部室壁运动状态.     

肥厚型心肌病与高血压性心脏病心肌超声组织定征的鉴别诊断

目的探讨肥厚型心肌病、高血压病患者与正常人左室后壁、室间隔心肌声学特性是否存在差异,以期将超声组织定征作为鉴别诊断的指标之一. 方法将被检者分成3组肥厚型心肌病组(HCM组)、高血压性心脏病组(EH组)及正常对照组,分别测定各组左室后壁、室间隔部位的心肌背向散射参数.结果左室后壁心肌HCM组与EH组的IBS、CVIB无显著性差异(P>0.05),而与正常对照组均有差异(P<0.05);室间隔部位3组IBS、CVIB均有显著性差异(P<0.05);HCM组室间隔、左室后壁均存在IBS、CVIB的跨壁梯度,而EH组、正常对照组则无上述异常存在.结论 HCM患者左室后壁心肌的声学特性与正常对照组有差异,室间隔与左室后壁均存在IBS、CVIB的跨壁梯度.因此背向散射参数测定可作为鉴别肥厚型心肌病和高血压性心脏病的一项指标.     

原发性高血压患者心肌声学密度与左室舒张功能的关系

目的 探讨原发性高血压患者不同左室构型的心肌声学密度(AD)和左室舒张功能的关系.方法 选择原发性高血压患者92例,根据左心室质量指数和相对室壁厚度分成4 组:正常构型组(20例)、向心性重构型组(22例)、向心性肥厚型组(30例) 和离心性肥厚型组(20例).健康体检者30例作为正常对照组.用AD技术测量室间隔和左室后壁矫正的声学强度(CAI1、CAI2)及背向散射积分周期变化值(CVIB1、CVIB2),LVW测定二尖瓣口血流速率E/A比值.结果 (1)正常构型组的CAI1、CAI2、CVIB1及CVIB2值与正常对照组比较均无显著性差异,高血压余组的CAI1、CAI2值显著高于正常对照组(P＜0.01),以向心性肥厚型组为最高,其次是向心性重构型组、离心性肥厚型组,CVIB1、CVIB2值显著低于正常对照组(P＜0.05),以向心性肥厚型组为最低,其次是离心性肥厚型组、向心性重构型组;(2)高血压各组E/A值均显著低于正常对照组(P＜0.01);(3)CAI1、CAI2与E/A比值呈显著负相关(P＜0.01),CVIB1、CVIB2与E/A比值呈显著正相关(P＜0.01).结论 心肌AD参数可用来评价高血压患者不同左室构型心肌纤维化程度,并且与左室舒张功能显著相关.     

超声背向散射积分技术定量评价糖尿病性心肌病的临床研究

目的　探讨背向散射积分技术在评价糖尿病患者心肌病变方面的应用价值。方法　采用 HP Sonos-5 5 0 0型超声诊断仪配置的 AD-IBS软件 ,对比测定 33例 2型糖尿病患者和 2 2例健康志愿者心肌组织的 IBS% (背向散射积分均值的校正值 )和 CVIBS%(背向散射积分周期变异率的校正值 )。结果　 1糖尿病组室间隔及左心室后壁 IBS%较对照组增大 ( P值分别 <0 .0 5和 <0 .0 1) ,CVIBS%较对照组减小 ,但无统计学差异 ;2左心室收缩功能参数 EF(射血分数 )和 FS(短轴缩短率 )两组间无统计学差异 ;舒张功能参数 TVI-E/ TVI-A(二尖瓣口舒张期血流 E峰和 A峰时间速度积分比值 )糖尿病组显著低于对照组 ( P<0 .0 5 )。结论　糖尿病患者心肌组织特征与健康者显著不同 ,背向散射积分测定可以定量评价糖尿病患者早期心肌病变     

慢性肾功能不全患者心肌背向散射积分参数变化的临床意义

目的 :探讨心肌背向散射积分参数评价慢性肾功能衰竭患者心肌病变的临床价值。方法 :应用背向散射积分联机分析技术检测 3 6例慢性肾功能衰竭患者和 3 0例正常人前间隔标化平均背向散射积分值 (AII% )以及背向散射积分周期变异幅度 (CVIB)。结果 :与正常人比较 ,慢性肾功能衰竭患者的心肌AII %明显增高 (2 2± 0 2vs 1 6± 0 4,P <0 0 5 ) ,而CVIB则明显降低 (5 2± 1 0vs 7 1± 1 2 ,P <0 0 5 )。结论 :心肌背向散射积分参数可以定量客观地评价慢性肾功能衰竭患者的心肌病变     

应用声学密度定量技术预测再灌注心肌存活

目的　评估声学密度定量 (AD)技术预测再灌注心肌存活的可能性。方法　对心肌梗死的病史六个月以内的 16例患者于PTCA术前及术后第 3天、半年进行 AD技术测定。仪器采用 HPSONOS- 5 5 0 0超声诊断仪。S4探头 ,频率 2～ 4MHz。将感兴趣区域置于梗死区 ,测量心肌的背向散射 (IBS)积分的心动周期变化幅度 (CVIB)和室壁增厚率。将测量所得参数进行配对 t检验 ,数据以 x± s表示 ,P<0 .0 5为有统计学意义。结果　 16例患者中 ,PTCA术后第 3天 ,CVIB较术前改变超过 1d B的有8例 ,(4 .1± 1.6 vs5 .5± 1.8d B,P<0 .0 5 ) ,CVIB…     

肥胖对中青年人群心脏结构和功能的影响

目的　研究肥胖对我国中青年人群心脏结构和功能的影响。方法　选择 6 7例肥胖者和 2 3名健康者。肥胖者根据体重指数 (BMI)分为三组。采用美国HDI30 0 0彩色多普勒超声心动图仪测量 ,比较各组间心脏结构 (收缩末期左室内径 (LVESD)、舒张末期左室内径 (LVEDD)、室间隔 (IVS)及左室后壁 (LVPW )厚度 ,左室重量 (LVM )和左室重量指数 (LVMI) )和功能 (左室每搏量指数 (SVI) ,射血分数 (EF) ,舒张早期血流充盈峰值流速E、舒张晚期充盈峰值流速A及E/A ,并测量等容舒张时间 (IVRT) )参数。结果　肥胖组同健康组比较 ,LVEDD、LVESD增宽 ,IVS、LVPW增厚 ,LVM、LVMI增加 ,舒张早期充盈峰值流速E降低 ,舒张晚期充盈峰值流速A升高 ,E/A比值降低 ,IVRT延长 ,差异有显著性 (P <0 0 5 )。并随肥胖程度的加重有加重趋势。肥胖组收缩功能参数与健康组比较变化无显著性 (P >0 0 5 )。肥胖组体重指数与LVEDD显著正相关 (r =0 37,P <0 0 5 ) ,与LVM显著正相关 (r =0 5 3,P <0 0 5 ) ,与E/A峰速度比值显著负相关 (r =- 0 2 7,P <0 0 5 )。结论　肥胖可引起中青年人群心脏肥大 ,使中青年人群心脏舒张功能下降 ,并随肥胖程度而加重。     

多普勒组织成像对正常人左心室收缩功能的分析

目的 :应用多普勒组织成像脉冲技术评价正常人左心室整体收缩功能。研究二尖瓣环舒缩速度与左心室整体收缩功能间的相关性 ,以及观察二尖瓣环舒缩速度与左心室射血分数间是否存在直线回归关系。方法 :转换多普勒组织成像速度模式 ,取心尖四腔心、二腔心、心尖左心室长轴切面 ,分别测量二尖瓣环后间隔、侧壁、前壁、下壁、前间隔及后壁的舒张早期峰值速度 (E)、舒张晚期峰值速度 (A)、收缩期峰值速度 (S)。应用改良Simpson法测量左心室射血分数。结果 :左心室射血分数与二尖瓣环前间隔S、E与肺静脉D波比值 (E/D) ,后间隔S ,前壁与后壁的E/D存在直线相关关系。结论 :多普勒组织成像测量二尖瓣环舒缩速度可反映左心室整体收缩功能。并且发现左心室收缩功能不仅与二尖瓣环收缩速度有关 ,而且与舒张速度也相关。二尖瓣环前间隔是反映这一现象的最好位点。     

Tissue Doppler imaging in the normal fetus

Tissue Doppler imaging is a new non-invasive method that derives measurements of relaxation velocities directly from the myocardium. This approach to studying myocardial velocities offers the potential for quantitative assessment of diastolic ventricular function. Data on myocardial tissue velocities in normal fetuses have not been established. We measured motion velocities of the left ventricular posterior wall, right ventricular anterior wall, interventricular septum along the long axis in 30 normal fetuses aged 19-38 weeks gestation (mean, 26.3+/-6.0 weeks). In all fetuses, peak myocardial velocities during early diastole (EW) and atrial contraction (AW) waves were recorded. The mean values for EW, AW, and E/AW of left ventricle were 5.4+/-1.7, 7.0+/-1.4 cm/s, and 0.77+/-0.19, respectively, and those of right ventricle were 5.5+/-1.5, 7.8+/-1.5 cm/s, and 0.70+/-0.14, respectively. The EW(4.1+/-1.0 cm/s) and the AW (5.3+/-0.8 cm/s) of the interventricular septum were significantly lower than those of the left and right ventricular walls (P<0.01). The EW and E/AW of the left ventricular wall increased significantly with increasing gestational age (r=0.81 and 0.85, respectively, P<0.01). Similar changes were observed in the myocardial velocities of the right ventricular wall. The EW and E/AW of the interventricular septum also increased significantly with age (r=0.63 and 0.78, respectively, P<0.01). However, AW of the interventricular septum showed little changes. In both ventricles, there were significant correlations between tissue Doppler E/AW and pulsed Doppler E/A (LV, r=0.56; and RV, r=0.60, P<0.01). Assessment of myocardial tissue velocities in fetuses is feasible with tissue Doppler imaging. Age-related alterations in tissue Doppler velocities may suggest age-related maturational changes in diastolic function.     

Preclinical cardiac involvement in phaeochromocytoma: a study with integrated backscatter

Objective It is well known that vascular and cardiac structure may be influenced by circulating neurohormonal factors. Our aim was to study the myocardial wall texture by integrated backscatter (IBS) analysis in patients with phaeochromocytoma (PHEO). Design Fourteen patients with PHEO, 15 matched high‐normal blood pressure (BP) subjects, 15 mild essential hypertensives and 15 normotensive controls underwent two‐dimensional conventional ultrasonography and ultrasonic IBS of the myocardial wall. IBS analysis was performed at both interventricular septum and posterior wall levels. IBS values were expressed in decibels and corrected for the IBS values obtained within the pericardium (C‐IBS). The systo‐diastolic cyclical variations in IBS (CV‐IBS), an index of myocardial contractile performance, were also evaluated. Results Patients with PHEO showed C‐IBS values comparable to those of hypertensive patients, and significantly higher than those of high‐normal BP subjects and controls at both septum and posterior wall levels (P < 0·001 for all). In PHEO patients, CV‐IBS was lower than that of normotensive, high‐normal BP subjects and hypertensive patients, at both septum and posterior wall levels (P < 0·001 for all). An inverse relationship was found in the PHEO group between 24‐h urinary normetanephrine and CV‐IBS of both septum (r² = –0·29, P < 0·05) and posterior wall (r² = –0·46, P < 0·05). Conclusions Our results show that patients with PHEO have myocardial remodelling characterized by increased myocardial fibrosis, confirmed by an increase in the overall myocardial backscatter level measured. The observed decrease in the magnitude of CV‐IBS suggests an impairment of myocardial contractile performance. These results may provide insights into the role of catecholamines in left ventricular (LV) structure and function in PHEO.     

应用应变率成像技术对尿毒症患者左心室功能的评价

目的 应用应变率成像技术评价尿毒症患者左室的局部收缩与舒张功能。方法 40例尿毒症患者,左室肥厚(LVH)组25例,非左室肥厚(NLVH)组15例及30例正常对照组。取心尖四腔、心尖两腔、心尖左室长轴切面测量左室各室壁心肌收缩期、舒张早期、房缩期的峰值速度(VS、VE、VA)、峰值应变率(SRS、SRE、SRA)、最大应变及位移。结果 速度Vs、VA:尿毒症患者较正常对照组无显著性差异,VE:尿毒症患者NLVH组后间隔、下壁较正常对照组显著性减低,LVH组除后壁外余左室各壁较正常对照组显著性减低。尿毒症患者两组间仅在前间隔有显著性差异。应变率SRS:尿毒症患者LVH组左室侧壁较正常对照组显著性减低。SRE:尿毒症患者NLVH组左室侧壁、下壁、后壁较正常对照组显著性减低,LVH组除后间隔外左室各壁较正常对照组显著性减低。LVH组前间隔及前壁的SRE较NLVH组显著性减低。SRA:尿毒症患者较正常对照组无显著性差异。应变S:尿毒症患者NLVH组仅有左室侧壁较正常对照组有显著性差异,LVH组除后间隔外其余左室壁较对照组显著性减低。LVH组前壁的应变较NLVH组显著性减低。位移D:尿毒症患者NLVH组仅在后间隔较正常对照组显著性减低,LVH组后间隔、后壁、前间隔、下壁较正常对照组显著性减低(分别P<0.05和0.01)。结论 应变率成像技术能够早期评尿毒症患者左室的心肌运动功能。     

Cyclic variation of the myocardial integrated backscatter signal in hypertensive cardiopathy: a preliminary study.

BACKGROUND: Ultrasound tissue characterization studies realized through integrated backscatter analysis with end-diastolic sampling in hypertensive cardiopathy have demonstrated that abnormalities in the left ventricular myocardial ultrasonic texture are present in extreme forms of left ventricular hypertrophy (LVH). Such abnormalities are not evident in the athlete's heart. The aim of the present study was to analyze the ultrasonic backscatter myocardial indexes both as peak end-diastolic signal intensity and as cardiac-cyclic variation in two models of LVH: hypertensive cardiopathy and athlete's heart. METHODS: Three groups of 10 subjects each, all men of mean age (31.6+/-3.5 years), and of comparable weight and height, were analyzed. Group A comprised 10 cyclists of good professional level, while hypertensive patients were grouped in Group H. Both groups presented a comparable left ventricular mass (LVM). Group C included 10 healthy subjects acting as controls. The men with hypertension were selected on the basis of the results of ambulatory monitoring of the blood pressure according to ISH-World Health Organization guidelines (International Society of Hypertension). A 2D-color Doppler echocardiography with a digital echograph Sonos 5500 (Agilent Technologies, Andover, Massachusetts, USA), was carried out on all the subjects in the study for conventional analysis of the LVM and function. The ultrasonic myocardial integrated backscatter signal (IBS) was analyzed with an 'acoustic densitometry' module implemented on a AT echograph. The signal was also sampled with a region of interest (ROI) placed at interventricular septum and at posterior left ventricular wall level. The systo-diastolic variation of the backscatter was also considered, as cyclic variation index (CVIibs). RESULTS: According to the inclusion criteria, the LVM was comparable in groups A and H, but it was significantly higher than group C (left ventricular mass (body surface) (LVMbs)=154.5+/-18.7 (A), 146.8+/-25.5 (H), 101.4+/-12.4 (C), p < 0.001). The end-diastolic IBS did not show significant statistical differences among the three groups. The CVI(IBS) both at septum (30.5+/-5.3 (A), 13.2+/-13.1 (H), 27.2+/-7.3(C), p < 0.002) and posterior wall level (43.7+/-9.1 (A), 16.5+/-12.1 (H), 40.7+/-9.1 (C), p < 0.001) though, was significantly lower in the hypertensive patients than in both the athletes and the control group, where the results were comparable. CONCLUSION: A significant alteration of the myocardial CVIibs (both for septum and posterior wall) was found in the hypertensive model. This was probably the expression of an alteration in the intramural myocardial function.     

组织多普勒技术评价扩张型心肌病左室心功能的临床价值

目的探讨组织多普勒技术(TDI)检测扩张型心肌病(DCM)左室心功能的临床价值。方法选择DCM病人和正常健康者各40例,用TDI于胸骨旁长轴检测室间隔及左室后壁中间段短轴方向心肌运动速度(MV),并计算心肌运动速度阶差(MVG);经心尖窗检测左室前壁、后壁、下壁、侧壁和前壁、后壁室间隔中间段长轴方向MV。结果DCM组病人出现4种MV频谱形态异常,长轴、短轴方向MV均明显低于正常对照组(P<0.05或P<0.01);DCM组MVG也明显低于正常对照组(P<0.05或P<0.01)。结论TDI可定量评价DCM病人左室心肌功能,丰富了DCM的超声诊断手段。     

Ultrasonic myocardial tissue characterization in patients with hypertrophic cardiomyopathy and pressure-overloaded hypertrophy by backscattered energy temporal analysis.

This study measured integrated backscatter (IB) values in the subendocardium and subepicardium of patients with hypertrophy using the newly developed Backscattered Energy Temporal Analysis (BETA) system, and evaluated the differences of acoustic properties according to etiology. Twenty-one patients with hypertrophic cardiomyopathy (HCM), 16 with pressure-overloaded hypertrophy (POH), and 21 controls were studied. M-mode formatted IB images were obtained using BETA and the region of interest (ROI), automatically divided into epicardial and endocardial halves of the myocardium, was placed in the ventricular septum and posterior wall. Values for the cyclic variation of IB (CVIB) in the entire ROI and in each half of the ROI were obtained. CVIB significantly decreased in the ventricular septum in HCM and POH compared with normal subjects, but there were no significant differences between HCM and POH. In the posterior wall, the CVIB was less in the subendocardium than in the epicardium in POH, and was also less than in normal subjects (7.0+/-1.7 dB vs 8.6+/-1.9 dB and 8.8+/-2.1 dB, p<0.05, respectively). Separate ultrasonic tissue characterization of the subendocardium and subepicardium provides further etiological information of various heart diseases.     

糖尿病或糖耐量异常高血压患者左室收缩功能

目的评价2型糖尿病和糖耐量异常对原发性高血压患者左室收缩功能的影响。方法原发性高血压患者92例,年龄(52±13)岁,其中女性24例,接受常规超声和组织多普勒成像应变率(SR)检查,其中合并2型糖尿病患者25例,合并糖耐量异常27例。结果合并2型糖尿病或糖耐量异常患者的常规超声心动图左室收缩功能指标与单纯原发性高血压患者无显著差异(P>0·05)。合并2型糖尿病患者各节段的SR均比合并糖耐量异常(前侧壁心尖部P<0·05,其余均为P<0·01)和单纯原发性高血压患者(室间隔心尖部P<0·01,其余均为P<0·001)小,合并糖耐量异常患者部分节段的SR(室间隔基底部、前侧壁基底部和心尖部,P<0·05)较单纯性高血压患者小。SR与性别、年龄、E/A比值、IV1RT和LVMI等均无相关性(P>0·05)。结论在常规方法显示左室收缩功能正常的原发性高血压患者中,超声成像应变技术提示合并糖尿病及糖耐量异常的高血压患者左室收缩功能较单纯高血压患者有一定程度降低。     

电磁脉冲照射前后大鼠心肌超声背向散射参数变化的研究

目的探讨电磁脉冲照射前、后SD大鼠心肌组织超声背向散射参数变化特点。方法40只二级雄性SD大鼠,单盲法随机分为辐照组和对照组,辐照组给以相应参数的电磁脉冲（EMP）照射,对照组给以假照射。分别于照射前、照射后24 h采集大鼠胸骨旁左室短轴射频图像,并测量感兴趣区心肌背向散射积分（IBS）值、心腔内血池IBS值,计算出标准化心肌背向散射积分（IBS%）,两时间点采集图像后每组各活杀10只大鼠,取心肌组织行透射电镜观察。结果EMP照射后大鼠心肌细胞水肿,细胞器改变。与对照组比较,辐照组照射24 h后左室前后壁IBS%均显著降低（P<0.01）;后壁IBS值减低（P<0.05）。辐照组前、后壁IBS及IBS%均显著降低。结论SD大鼠EMP照射后心肌IBS%值较照射前降低,IBS值有不同程度改变,提示EMP照射后心肌组织的病理学改变。     

Ultrasonic tissue characterization and Doppler tissue imaging in the analysis of left ventricular function in essential arterial hypertension: a preliminary study

It is not known if diastolic abnormalities are independent of systolic dysfunction in arterial hypertension. We studied three groups of 10 male subjects of comparable mean age (31.6 +/- 3.5 years), weight, and height: Athletes (A) (cyclists), essential hypertensive patients (H), and controls (C). Ultrasonic myocardial integrated backscatter signals (IBS) of the septum and the posterior wall were analyzed, while the systo-diastolic variation of the backscatter was considered as a cyclic variation index (CVI(ibs)). Myocardial velocities across the left ventricular major axis were sampled at septum and lateral wall levels by pulsed-wave Doppler tissue imaging (DTI). CVI(ibs) at the septum and the posterior wall were significantly lower in the hypertensive group in comparison with athletes and controls, who were comparable. Early diastolic myocardial velocity (E(m)) of the lateral wall and of the septum were significantly lower in hypertensives, while the late diastolic myocardial velocity (A(m)) was significantly higher in hypertensives in comparison with athletes. The E(m)/A(m) at the septum level was significantly lower in hypertensives in comparison with athletes and controls. Significant correlations were found between CVI and DTI parameters: CVI(ibs) and E(m)/A(m) septum (r = 0.50, P < 0.002). Furthermore, significant correlations were found between mean arterial pressure (MAP) and E(m)/A(m) septum (r = - 0.65, P < 0.001). Ultrasonic tissue characterization with the intrinsic contractility study and the evaluation of the regional diastolic function should, therefore, represent a new integrated diagnostic modality for the evaluation of left ventricular hypertrophied intramyocardial function. This study demonstrated that diastolic abnormalities of left ventricular function, in arterial hypertension, are related and progress with systolic intrinsic dysfunction.