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1.
The left ventricular twist was evaluated by 2-dimensional ultrasound speckle-tracking imaging (STI) in 50 patients with hypertension with normal geometric left ventricle (LV) and 45 normal subjects as control group. The mean value of LV rotation was obtained at each plane Using STI. LV twist and twist velocity were defined as apical rotation/rotation rate relative to the base respectively. To adjust the intersubject differences in heart rates, the time sequence were normalized. The results showed that peak twist developed near the end of systole. Peak LV twist was significantly higher in patients with hypertension than normal controls (P〈0.001). The diastolic untwisting mainly occurred in early diastole (=38%). Compared with normal controls, untwisting rate (Untw R) in patients with hypertension was significantly reduced (P〈0.001), and untwisting half-time (UHT) was significantly delayed (P〈0.05). This study demonstrated that STI has a potential ability to evaluate the early change of heart function in patients with hypertension by measuring the twist of LV.  相似文献   

2.
To investigate the value of ultrasound speckle tracking imaging (STI) in the assessment of the short-axis and long-axis systolic function of the left ventricle (LV) in patients with type 2 diabetes mellitus (DM), 100 subjects with normal ejection fraction were studied, including 41 patients with DM only (DM group), 22 patients with both DM and left ventricular hypertrophy (DH group), and 37 healthy subjects (control group). Left ventricle systolic function in the long axis defined as longitudinal strain, and that in the short axis defined as radial strain, apical and basal LV rotations, and LV twist were assessed respectively. The results showed that average peak strain in the long axis at basal, middle and apical levels, and global peak strain were significantly decreased in the patient groups when compared with the control group (P〈0.001 for each). The parameters in DH group were significantly lower than those in DM group (P〈0.01 for each). There were no significant differences in average radial peak strain in the short axis at different levels, and global peak strain among the three groups (P〉0.05). Apical and basal LV rotations, and LV twist were greater in the patient groups than in the control group (P〈0.01 for each). Basal LV rotation and LV twist were greater in DH group than those in DM group (P〈0.01). It was concluded that STI may be used to identify early abnormalities in patients with type 2 DM that have normal left ventricular systolic function.  相似文献   

3.
Speckle tracking imaging (STI) was employed to investigate the effect of right ventricular (RV) volume and pressure overload on left ventricular (LV) rotation and twist in 35 patients with atrial septal defect (ASD), 18 of which with pulmonary hypertension, and 21 healthy subjects serving as controls. The peak rotations of 6 segments at the basal and apical short-axises and the average peak rotation and interval time of the 6 segments in the opposite direction during early systolic phase were measured respectively. LV twist versus time profile was drawn and the peak twist and time to peak twist were calculated. LV ejection fraction (EF) was measured by Biplane Simpson. Compared to ASD patients without pulmonary hypertension and healthy subjects, the peak rotations of posterior, inferior and postsept walls at the basal level were lower (P〈0.05), and the average counterclockwise peak rotation of 6 segments at the basal level during early systolic phase was higher (P〈0.05), and the average interval time was delayed (P〈0.05). LV peak twist was also lower (P〈0.05), and had a significant negative correlation with pulmonary arterial systolic pressure (r=-0.57, P=0.001). No significant differences were found in LVEF among the three groups. It was suggested that although RV volume overload due to ASD has no significant effects on LV rotation and twist, LV peak twist is lower in ASD patients with pulmonary hypertension. Thus LV twist may serve as a new indicator of the presence of pulmonary hypertension in ASD patients.  相似文献   

4.
To assess the normal value of left ventricular twist (LVtw) and examine the changes with normal aging by 2-dimensional ultrasound speckle-tracking imaging (STI), 121 healthy volunteers were divided into three age groups: a youth group (19-45 y old), a middle-age group (46-64 y old ) and an old-age group (≥65 y old). Basal and apical short-axis images of left ventricular were acquired to analyse LV rotation (LVrot) and LVrot velocity. LVtw and LVtw velocity was defined as apical LVrot and LVrot velocity relative to the base. Peak twist (Ptw), twist at aortic valve closure (AVCtw), twist at mitral valve opening (MVOtw), untwisting rate (UntwR), half time of untwisting (HTU), peak twist velocity (PTV), time to peak twist velocity (TPTV), peak untwisting velocity (PUV), time to peak untwisting velocity (TPUV) were separately measured. The results showed that the normal LV performs a wringing motion with a clockwise rotation at the base and a counterclock- wise rotation at the apex (as seen from the apex). The LVtw velocity showed a systolic counterclockwise twist followed by a diastolic clockwise twist. Peak twist develops near the end of systole (96%±4.2% of systole). With aging, Ptw, AVCtw, MVOtw, HTU and PUV increased significantly (P〈0.05) and UntwR decreased significantly (P〈0.05). However, no significant differences in TPUV, PTV and TPTV were noted among the 3 groups (P〉0.05). It is concluded that LV twist can be measured non-invasively by 2-dimensional ultrasound STI imaging. The age-related changes of LVtw should be fully taken into consideration in the assessment of LV function.  相似文献   

5.
The left ventricular regional systolic functions in patients with hypertrophic cardiomyopathy (HCM) were assessed by using quantitative tissue velocity imaging (QTVI). Left ventricular (LV) regional myocardial velocity along long- and short-axis in 31 HCM patients and 20 healthy subjects were analyzed by QTVI, and the regional myocardial systolic peak velocities (MVS) were measured. Mean MVS at each level including mitral annular, basal, middle and apical segments were calculated. The ratio of MVS along long-axis to that along short-axis (Ri) at basal and middle segments of the LV posterior wall and ventricular septum were calculated. The results showed that mean MVS was slower at each level including mitral annular, basal, middle and apical segments in the HCM patients than that in the healthy subjects (P〈0.01). There were no significant differences in mean MVS between obstructive and non-obstructive groups in HCM patients. MVS of all regional myocardial segments along long-axis in the HCM patients were significantly slower than that in the healthy subjects (P〈0.05), but there was no significant difference in MVS of all regional myocardial segments along long-axis between hypertrophied and non-hypertrophied group in the HCM patients. Ri was significantly lower in the HCM patients than that in the healthy subjects. The LV regional myocardial contractility along long-axis was impaired not only in the hypertrophied wall but also in the non-hypertrophied one in patients with HCM, suggesting that QTVI can assess accurately LV regional systolic function in patient with HCM and provides a novel means for an early diagnosis before and independent of hypertrophy.  相似文献   

6.
In order to evaluate the left ventricular remodeling in patients with myocardial infarction after revascularization with intravenous real-time myocardial contrast echocardiography (RT-MCE), intravenous RT-MCE was performed on 20 patients with myocardial infarction before coronary revascularization. Follow-up echocardiography was performed 3 months after coronary revascularization. Segmental wall motion was assessed using 18-segment LV model and classified as normal, hypokinesis, akinesis and dyskinesis. Myocardial perfusion was assessed by visual interpretation and divided into 3 conditions: homogeneous opacification=l; partial or reduced opaciflcation or subendocardial contrast defect=2; constrast defect=3. Myocardial perfusion score index (MPSI) was calculated by dividing the total sum of contrast score by the total number of segments with abnormal wall motion. Twenty patients were classified into 2 groups according to the MPSI: MPSI≤I.5 as good myocardial perfusion, MPSI〉1.5 as poor myocardial perfusion. To assess the left ventricular remodeling, the following comparisons were carried out: (1) Comparisons of left ventricular ejection fraction (LVEF), left ventricular end-systolic volume (LVESV) and left ventricular end-diastolic volume (LVEDV) before and 3 months after revascularization in two groups;(2) Comparisons of LVEF, LVESV and LVEDV pre-revascularization between two groups and comparisons of these 3 months post-revascularization between two groups; (3) Comparisons of the differences in LVEF, LVESV and LVEDV between 3 months post-and pre-revascularization (ALVEF, ALVESV and ALVEDV) between two groups; (4) The linear regression analysis between ALVEF, ALVESV, ALVEDV and MPSI. The results showed that the LVEF obtained 3 months after revascularization in patients with MPSI〉1.5 was obviously lower than that in those with MPSI〈1.5. The LVEDV obtained 3 months post-revascularization in patients with MPSI〉1.5 was obviously larger than that in those with M  相似文献   

7.
Background Postconditioning has been shown to reduce infarct size, ischemic/reperfusion injury and myocardial injury in patients with acute myocardial infarction (AMI) undergoing percutaneous coronary intervention (PCI). This study tested the hypothesis that postconditioning attenuates the elevation of tumor necrosis factor-a (TNF-a) and improves heart function in patients with AMI after PCI. Methods A total of 75 patients were randomly assigned to 1 of 3 groups: the routine group (n=-26), in which no intervention was given at the onset of reperfusion; and the Postcon-30s (n=25) or Postcon-60 s (n=24) groups, in which 3 cycles of 30- or 60-second balloon deflation and inflation were repetitively performed. TNF-a serum concentration was measured by ELISA. Global and regional left ventricular systolic function was determined by echocardiography at 1 year. Thirty-four normal controls (NC) were enrolled in the study. Results The TNF-a concentration in patients with AMI was significantly elevated at baseline compared to controls (P 〈0.01). Concentration levels increased in the routine and Postcon-30s, but not in Postcon-60s group at 7 days (P 〈0.05). As for linear associations among the three groups, left ventricular ejection fraction (LVEF) and wall motion score index (WMSI) were ranked as follows: Postcon-60s 〉Postcon-30s〉routine (P values all 〈0.05, 65% vs. 57% vs. 52% and 1.10 vs. 1.27 vs. 1.53) after 1 year. More importantly, there was a significant relevance between the soluble TNF-a serum concentration at 7 days and LVEF or WMSI after 1 year (Pvalues all 〈0.0001). Conclusions Postconditioning, in particular Postcon-60s was associated with long-term cardioprotective effects for inhibition of the inflammatory response and reperfusion injury. The soluble TNF-a serum concentration provided powerful prognostic information of global and regional left ventricular systolic function in patients with AMI.  相似文献   

8.
Background Pulmonary hypertension (PH) is a set of pathophysiological syndromes characterized by increased pulmonary artery pressure and pulmonary vascular resistance,resulting in increased right ventricular afterload.The left and right ventricles interact through hemodynamics.What impact will PH have on synchronization and function of the left ventricle (LV)? The aim of this study was to evaluate the synchronization of the left ventricular wall motion and left ventricular function in patients with varying degrees of PH using velocity vector imaging (Wl) technology.Methods Sixty patients with chronic PH served as the experimental group,and 20 healthy volunteers served as the control group.According to the different degrees of pulmonary artery systolic pressure,the experimental group was divided into three groups:mild,moderate,and severe PH groups.The time to peak systolic longitudinal velocity (Tvl),the peak systolic longitudinal velocity (Vsl),the peak diastolic longitudinal velocity (Vel),the peak systolic longitudinal strain (SI),and strain rate (SRI) in 18 segments were measured in each group.Results TvI in the control group and each group with PH was reduced from basal to apical segment,and in control group Tvl in various segments of the same wall and in different walls showed no significant difference (P >0.05).With increase in pulmonary artery pressure,Tvl values measured showed an increasing trend in groups with PH.In groups with PH,Vsl and Vel of each wall were reduced sequentially from basal to apical segments,showing gradient change; Vsl and Vel values measured showed a decreasing trend with increase in pulmonary artery pressure,in which the differences of Vel values measured in the control group and the mild PH group were statistically significant (P <0.01),and the differences between other groups were statistically significant (P <0.01).In groups with PH,SI and SRI in basal segment and the middle segment of each wall were decreased; the difference between groups was statistically significant (P <0.01).Conclusions Asynchronization of the LV and decreased left ventricular function were present in patients with chronic PH;WI technology can accurately evaluate left ventricular function in patients with PH,and indicators such as Tvl,Vsl,and Vel are valuable.  相似文献   

9.
Background  Tagged magnetic resonance imaging (MRI) is the non-invasive golden standard to measure myocardial deformity. Tissue Doppler Imaging can be used to assess myocardial deformity, however, it has the limitation of angle-dependence. Our study aimed to compare left ventricular torsion and strains measured by velocity-vector imaging (VVI) using echocardiography (echo-VVI) and MRI (MRI-VVI), and to validate them against harmonic phase tagged MRI (HARP MRI).
Methods  A total number of 34 subjects (14 normal and 20 patients) were evaluated. Apical and basal image of left ventricular short axis view were acquired for measurements of apical and basal rotation, circumferential and radial strain using both echo-VVI and MRI-VVI. An apical four-chamber view was obtained for measuring the distance between the apical and basal levels.
Results  The correlations of segmental rotations, circumferential and radial strains were high between echo-VVI and HARP MRI, while the agreement of apical rotation was poor. Left ventricular torsion showed much better correlation and agreement between echo-VVI and HARP MRI than apical rotation: the coefficient was 0.97, P <0.001. The correlation between MRI-VVI and HARP MRI in quantifying rotational parameters and strains was similar with echo-VVI and HARP MRI. Echo-VVI could discriminate normal and dysfunctional ventricles on either hypertensive or dilated cardiomyopathy.
Conclusion  The data from this study show that (1) it is feasible to quantify left ventricular torsion and myocardial strain using echo-VVI and MRI-VVI in normal subjects, patients with left ventricular global systolic dysfunction and segment systolic dysfunction; (2) the agreement among all mechanical parameters derived from echo-VVI, MRI-VVI, and HARP MRI remained with clinically acceptable ranges.
  相似文献   

10.
Background Tissue Doppler imaging (TDI) has provided an objective means to quantify global and regional left ventricular (LV) and right ventricular (RV) function with improved accuracy and greater reproducibility than conventional echocardiography. This study was conducted to assess RV myocardial systolic activation by TDI in subjects with pulmonary arterial hypertension (PAH). Methods A total of 30 patients with PAH and 30 healthy volunteers, all comparable in age and sex, underwent standard Doppler echo and TDI. Using pulsed Doppler echocardiography combined with TDI, the following regional parameters were evaluated in three different myocardial segments (RV basal lateral wall, basal septal, and LV basal lateral) on apical 4-chamber view: systolic (Sm), early- and late-diastolic (Em and Am) peak velocities. RV myocardial systolic activation delay was defined as the difference in time to peak TDI systolic velocities between the RV basal lateral wall and basal septal. In addition, RV end-diastolic and end-systolic areas were measured to calculate RV fractional area change from the same apical 4-chamber view. Results Compared with the control group, patients with PAH showed increased RA and RV end-diastolic diameter (RA: (4.5±1.2)cm vs (3.0±0.8)cm, P〈0.05 and RV: (4.8±1.9)cm vs (3.4±0.5)cm, P〈0.05) and reduced RV fractional area change; (35±14)% vs (56±9)%, P〈0.05. These PAH patients showed lower myocardial peak velocities and a significant activation delay compared with controls (P〈0.05). Moreover, a strong correlation between RV myocardial systolic activation delay and RV fractional area change was shown in patients with pulmonary arterial hypertension (r = -0.82). Conclusions In PAH, RV myocardial systolic activation was markedly delayed, which was directly related to the RV fractional area change. RV myocardial systolic activation delay assessed by TDI could offer a unique approach to predict RV dysfunction.  相似文献   

11.
[目的]探讨应用二维应变超声心动图(2DSE)评价冠心病(CHD)患者的左心室旋转和扭转运动的临床价值.[方法]应用GE Vivid 7 Dimension超声心动图仪采集35例冠心病患者(冠心病组)及30例正常人(对照组)左心室短轴二尖瓣环及心尖水平切面的二维灰阶图像,计算左心室心尖部和心底部的旋转角度及旋转率、左心...  相似文献   

12.
目的:采用二维超声斑点追踪成像技术测定高血压患者左心室旋转和扭转运动,评价其临床应用价值。方法:20例正常人和44例原发性高血压患者[包括左心室构型正常组(LVN组)21例和左心室重构组(LVR组)23例]获得心尖水平和基底水平左室短轴清晰二维图像存盘,运用QLAB超声工作站进行脱机分析,得到内膜旋转峰值、外膜旋转峰值、平面旋转峰值及平面扭转峰值,计算左心室整体的扭转峰值。结果:①基底水平:与正常组比较,LVN组内膜旋转峰值、跨壁扭转峰值显著增高(P<0.05);LVR组内膜旋转峰值、平面旋转峰值、跨壁扭转峰值显著增高(P<0.05)。与LVN组比较,LVR组内膜旋转峰值、外膜旋转峰值、平面旋转峰值和跨壁扭转峰值均显著增高(P<0.05)。②心尖水平:与正常组比较,LVR组内膜旋转峰值、平面旋转峰值和跨壁扭转峰值显著增高(P<0.05)。与LVN组比较,LVR组内膜旋转峰值、外膜旋转峰值、平面扭转峰值显著增高(P<0.05)。③左心室整体扭转:与正常组比较和与LVN组比较,LVR组扭转峰值均显著增高(P<0.05)。结论:超声二维斑点追踪显像技术可以准确评价高血压患者左心室旋转和扭转运动,高血压患者旋转与扭转运动力学参数较正常人整体上有明显增高。  相似文献   

13.
目的:探讨二维超声斑点追踪成像技术评价正常构型原发性高血压(EH)患者左心室局部和整体收缩功能的临床价值。方法:左心室构型正常(LVN)的原发性高血压患者26例,健康对照组25例,获取其心尖四腔、三腔及二腔二维图像,测定左室各节段心内膜下纵向收缩期峰值应变,并计算左室基底段水平、中间段水平、心尖段水平各6节段收缩期平均峰值应变及左室18节段平均应变。结果:与对照组比较,高血压病组左室各节段心内膜下纵向收缩期峰值应变显著降低(P<0.05或P<0.01);与对照组比较,高血压病组基底段水平、中间段水平、心尖段水平各6节段纵向收缩期平均应变值及左室18节段平均应变值显著降低(P<0.01)。结论:超声斑点追踪成像技术可以早期准确地评价原发性高血压患者左心室局部和整体心肌收缩功能。  相似文献   

14.
速度向量成像技术评价扩张型心肌病心脏扭转运动   总被引:2,自引:0,他引:2  
刘晓伟  李治安 《中华医学杂志》2009,89(27):1892-1896
目的 应用超声心动图速度向量成像(VVI)技术对扩张型心肌病(DCM)患者心脏扭转运动的改变进行初步分析,进一步探讨VVI技术在评价心脏扭转运动方面的价值.方法 采用VVI技术对33名正常人和30例扩张型心肌病患者进行研究.选取胸骨旁左室二尖瓣水平、乳头肌水平、心尖水平短轴切面及心尖四腔心、两腔心切面的图像,测量收缩期左室基底部、中部及心尖部最大旋转角度、峰值旋转速度、圆周应变(CS),达峰值旋转速度时间(TPRV);舒张末期及等容舒张末期峰值解旋转速度,对比两组心脏旋转和扭转运动.结果 (1)正常组左室扭转运动:自心尖部向心底部观察,等容收缩期心底部逆时针旋转,心尖部顺时针旋转;收缩期心底部顺时针旋转,心尖部逆时针旋转;乳头肌水平旋转形式不固定.左室整体扭转方向为逆时针.(2)部分DCM患者心脏扭转运动形式改变:30例研究对象中4例患者左室扭转形式不同于正常人,其中2例表现为心尖和心底均呈逆时针旋转,1例表现为心尖和心底均呈顺时针旋转,1例表现为心底部呈逆时针旋转而心尖部呈顺时针旋转.(3)旋转形式未发生变化的26例DCM患者的有关旋转和扭转运动参数均明显减低,以心尖部减低更为明显.DCM组与正常组相比:左室扭转角度7.34°±3.65°比17.01°±4.81°、扭矩(0.09±0.04)°/mm比(0.23±0.06)°/nun、扭转速度(60.23±23.67)°/s比(148.24 4-56.23)°/s、解扭转率(0.37±0.19)%/m比(0.59 4-0.33)%/m;心底部旋转角度-3.60°±2.38°比-6.56°±3.18°(P=0.014)、心尖部旋转角度5.80°±3.55.比12.13.±2.05°(P=0.000)、心底部CS-8.09%±2.73%比-19.49%±5.51%(P=0.013)、心尖部CS-8.94%4-5.90%比-27.49%4±9.53%(P=0.000).(4)左室扭转角度与射血分数呈正相关(r=0.489,P<0.05),DCM组心尖部TPRV较正常组明显延长,存在旋转运动不同步性(400.26 ±70.15)ms比(328.13±66.95)ms,P=0.008.结论 (1)DCM心脏扭转功能呈弥漫性损伤,扭转功能受损对心脏整体功能的减低具有明显影响.(2)部分DCM心脏扭转运动形式表现与正常人不同.(3)VVI可客观反映DCM患者的心脏扭转功能.  相似文献   

15.
目的:运用二维超声斑点追踪技术评价经皮室间隔封堵术前后患者心脏扭转运动的变化.方法:检测18例室间隔缺损患者封堵术前、术后第3天、术后1个月、术后3个月的常规心脏二维多普勒超声参数,并运用二维斑点追踪技术对患者的左心室旋转及扭转运动进行分析,以探讨室间隔缺损封堵术对其心脏扭转运动的影响.结果:封堵术后第3天,舒张期末左室内径(LVEDd)、左室舒张末容积(LVEDV)较术前减低较明显,左心室的基底部、心尖部的旋转角度及整体的扭转运动的角度较术前稍有减低.术后1个月、术后3个月,LVEDd、LVEDV较术前仍有降低,但降低的程度有减小的趋势;而左心室的基底部、心尖部的旋转角度及整体的扭转运动的角度仍有降低,降低的程度以术后1个月最明显,以后降低程度减小.患者封堵术前、术后第3天、术后1个月、术后3个月的LVEF稍有改变,但差异尤统计学意义.无论是封堵术前、术后第3天、术后1个月、还是术后3个月有,病人的左心室的基底部、心尖部的旋转角度峰值及整体的扭转运动的角度峰值均和LVEF呈线性相关,且以左室整体的扭转运动的角度峰值和LVEF的相关性最好.结论:经皮室间隔缺损封堵术通过逆转左室的重构而改善左室的扭转运动,且左室整体的扭转运动与LVEF的相关性最好.  相似文献   

16.
Summary To assess the normal value of left ventricular twist (LVtw) and examine the changes with normal aging by 2-dimensional ultrasound speckle-tracking imaging (STI), 121 healthy volunteers were divided into three age groups: a youth group (19–45 y old), a middle-age group (46–64 y old) and an old-age group (≥65 y old). Basal and apical short-axis images of left ventricular were acquired to analyse LV rotation (LVrot) and LVrot velocity. LVtw and LVtw velocity was defined as apical LVrot and LVrot velocity relative to the base. Peak twist (Ptw), twist at aortic valve closure (AVCtw), twist at mitral valve opening (MVOtw), untwisting rate (UntwR), half time of untwisting (HTU), peak twist velocity (PTV), time to peak twist velocity (TPTV), peak untwisting velocity (PUV), time to peak untwisting velocity (TPUV) were separately measured. The results showed that the normal LV performs a wringing motion with a clockwise rotation at the base and a counterclock-wise rotation at the apex (as seen from the apex). The LVtw velocity showed a systolic counterclock-wise twist followed by a diastolic clockwise twist. Peak twist develops near the end of systole (96%±4.2% of systole). With aging, Ptw, AVCtw, MVOtw, HTU and PUV increased significantly (P<0.05) and UntwR decreased significantly (P<0.05). However, no significant differences in TPUV, PTV and TPTV were noted among the 3 groups (P>0.05). It is concluded that LV twist can be measured non-invasively by 2-dimensional ultrasound STI imaging. The age-related changes of LVtw should be fully taken into consideration in the assessment of LV function.  相似文献   

17.
目的采用超声二维斑点追踪显像技术(STI)探讨肥厚型心肌病(HCM)患者左心室扭转运动(LVtw)的特征。方法随机选取心功能正常的HCM患者及正常对照者各20例,取胸骨旁左心室心尖和心底短轴观二维图像对左心室旋转进行测量分析,计算心底部旋转角度峰值(MV-Prot)及其达峰时间、心尖部旋转角度峰值(AP-Prot)及其达峰时间、扭转角度峰值(Ptw)及达峰时间、收缩期末扭转角度(AVCtw)、等容舒张期末扭转角度(MVOtw)、解旋率(UntwR)、解旋减半时间(HTU),并比较两组间上述各参数的差别。结果(1)与对照组相比,HCM组MV-Prot、AP-Prot、Ptw、AVCtw、MVOtw和HTU测值增加,UntwR测值减低(P均<0.05)。(2)HCM组左心室扭转角度达峰时间测值较对照组明显增加(P<0.05)。(3)HCM组内左心室旋转心尖部达峰时间较心底部测值明显增加(P<0.05)。结论应用STI可无创性评价HCM患者左心室旋转及扭转运动特征,HCM患者左心室旋转运动力学参数较正常人有明显异常改变。  相似文献   

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