门控心肌灌注断层显像评价扩张型心肌病患者左室同步性的价值

目的：本研究主要探讨门控心肌灌注显像诊断扩张型心肌病患者左心室收缩不同步的价值。方法选取在本院接受核素心肌灌注显像的扩心病患者共47例,根据心电图Q RS波时限分为Q RS波正常组（20例）和Q RS波增宽组（27例）;选取同时期35例正常受检者作为正常对照组。入选对象行99m Tc‐MIBI心肌灌注显像,观察门控数据,计算不同步指数（AI）以及左室射血分数（EF）、舒张末容积（EDV ）、收缩末容积（ESV ）等。运用方差分析比较各组间指标,运用秩和检验AI差异,以 P＜0．05作为差异具有统计学意义。结果三组EF之间均存在显著差异（ P＜0．001）;QRS增宽组13例为间隔‐侧壁收缩延迟,7例为前壁‐后壁收缩延迟,A I在2～5之间,Q RS波正常组中有2例存在间隔‐侧壁收缩延迟,AI分别为2、3,两组AI差异具有统计学意义（ P ＝0．03）。结论该方法能够直观了解左心室各壁运动的协调性,判断左室收缩延迟的具体部位和延迟程度,对左室不同步的诊断和治疗具有一定价值。     

门控心肌灌注SPECT相位分析技术评价心力衰竭患者左室不同步的价值

心脏再同步治疗(CRT)是晚期心力衰竭的重要治疗方法,从超声心动图(UCG)得到的左室机械不同步参数可作为CRT应答的重要预测因子,但在现有临床条件下,UCG技术包括组织多普勒成像(TDI)和心肌应变率成像,其作为常规临床手段来评价左室不同步还存在严重缺陷.目前的研究显示,门控心肌灌注SPECT相位分析技术能够用于CRT应答的预测,与基于UCG的TDI相比,其优势在于技术操作的高度自动化和结果的高度可重复性.     

门控心肌灌注断层显像相位分析评价健康人左室心肌收缩同步性

目的 应用美国Cedars-Sinai定量门控心肌断层显像(QGS)软件的相位分析技术定量分析健康人左室心肌收缩同步性.方法 对74名健康人[男41名,女33名,平均年龄(60±13)岁]进行运动-静息99Tcm-MIBI G-MPI.应用QGS软件对重建后的静息图像进行自动分析,获得左室心肌收缩同步性参数:相位直方图带宽(BW)和相位标准差(SD),比较不同性别及年龄组(＜60岁组,36名;≥60岁组,38名)间左室心肌收缩同步性的差别.测量左室17个节段的起始相位角度,确定左室心肌最早收缩部位,简单随机抽样选择40名受检者评价QGS软件相位分析技术在同一操作者和不同操作者间的重复性.数据分析采用两样本t检验和直线相关分析.结果 74名受检者左室BW和SD值分别为(37.22±11.71)°和(11.84±5.39)°.男性和女性BW及SD值差异均无统计学意义[BW:(36.00±9.70)°和(38.73±13.84)°;SD:(11.88±5.56)°和(11.79±5.26)°;t=0.96和-0.07,均P＞0.05).年龄≥60岁组较年龄＜60岁组BW宽[(39.95±12.65)°和(34.33±10.00)°;t=-2.11,P＜0.05];但2年龄组间SD差异无统计学意义[(11.18±4.31)°和(12.54±6.33)°;t=1.08,P＞0.05].74名受检者中,54名(73％)左室心肌收缩从基底部向心尖部扩散,仅20名(27％)由心尖部向基底部扩散.同一操作者2次操作及2名操作者间相位分析结果均相关(r=0.867～0.906,均P＜0.001).结论 健康人左室心肌收缩同步性良好,不同性别间无明显差异,年龄＜60岁者心肌收缩同步性较≥60岁者更好.QGS心脏相位分析软件是可定量评价左室心肌收缩同步性的工具,且重复性好.     

门控心肌灌注断层显像技术的初步体会

门控心肌灌注断层显像 ,不仅反映心肌供血状况 ,同时可以获得左心室容积曲线以及 EF值。亦可通过计算机重建以电影及三维图像显示心肌舒缩活动。我科于 1 998- 1 0～ 1 999- 1 2为止共进行门控心肌灌注检查 31例 ,现将检查结果报告如下。1　材料与方法1 .1　临床资料门控心肌灌注显像受试者 31例 ,男 1 8例 ,女1 3例 ,年龄 34～ 60岁 (平均 47岁 )。心电图正常者2 2例 (其中伴有胸闷者 1 2例 ) ,临床确诊为心肌梗死患者 2例 ,临床可疑冠心病患者 7例。1 .2　方法静脉注射99m Tc- MIBI 740 MBq 90 min后 ,用SPECT(Simens DIACAM)门…     

冠状动脉造影狭窄而核素心肌灌注显像阴性患者分析

目的探讨冠状动脉（简称冠脉）造影狭窄而核素心肌灌注显像阴性的影响因素。方法回顾性分析133例冠脉造影显示有狭窄病变而核素运动心肌灌注显像正常患者的检查资料，比较2种检查的差异。结果所有患者均完成了运动负荷心肌灌注显像，其中46例（35％）运动负荷试验达到了满意的次极量运动心率。133例冠脉造影显示单支病变84例（63％），双支病变31例（23％），三支病变17例（13％），单纯左主干病变1例（1％）；17例三支病变中有13例（76％）各支血管之间的狭窄程度相差≤20％，显示狭窄病变较均衡。133例患者狭窄冠脉共202支，其中左前降支（LAD）93支（46％）、左回旋支（LCX）52支（26％）、右冠状动脉（RCA）52支（26％），左主干5支（2％）；狭窄程度为50％～70％的86支（43％）、〉70％～90％的有100支（49％）、〉90％～100％的有16支（8％）。结论冠脉造影狭窄而核素心肌灌注显像阴性多出现于运动量不足、轻中度狭窄病变、单支病变及均衡性三支病变患者。     

201Tl定量门控心肌灌注体层显像与99mTc-红细胞门控心血池显像测定左心室射血分数的对比研究

目的 探讨201Tl定量门控心肌灌注体层显像与99mTc-红细胞门控心血池显像测量左心室射血分数(LVEF)的相关性.方法 72例受检者接受201Tl静息门控心肌灌注体层显像,用AUTOQUANT 4.21软件测量LVEF,并与24 h内的静息99mTc-红细胞平衡法门控心血池显像结果进行比较.结果 ①门控心肌灌注体层显像与门控心血池显像测量LVEF值的结果呈明显正相关(r=0.554,P=-0.000),两种方法无统计学差别(t=1.194,P＞0.05).②不同疾病组之间两种测量方法无统计学差异(P值均大于0.05).③门控心肌灌注体层显像及门控心血池显像测量的LVEF值分别为(64.68±10.77)%和(62.46±8.99)%,门控心肌灌注体层显像测量的LVEF值要比门控心血池显像高出3.55%.结论 201Tl门控心肌灌注体层显像与99mTc-红细胞门控心血池显像测量LVEF值的相关性好且结果准确,但门控心肌灌注体层显像的LVEF测量值要稍高于门控心血池显像.     

SPECT门控心肌灌注显像相位图在冠状动脉慢性闭塞病变患者中的应用价值

目的分析冠状动脉慢性闭塞病变（CTO）患者SPECTG—MPI相位图,探讨其在CTO患者中的应用价值。方法回顾性分析2012年中国CTO俱乐部的21例CTO患者[均为男性,年龄37～77（平均56．6）岁]。患者术前完成^99Tc^m-MIBIG—MPI和^18F—FDG心肌代谢显像。应用G—MPI所测LVEF评价左心室功能,并将患者分为2组：正常组（11例,LVEF〉60％）和非正常组（10例,LVEF≤60％）。采用两样本t检验或Wilcoxon秩和检验比较2组患者的LVEF、灌注／代谢缺损、左心室收缩同步性参数,分析CTO患者中同步性参数[峰相位,相位标准差（SD）,相位图带宽、偏斜及陡度]与LVEF的线性相关性。结果21例CTO患者闭塞时间为3—60个月,相位SD和相位图带宽均高于健康参考值,分别为（30．8±28．3）°与（14．2±5．1）°,t=3．09;（58．1±39．4）°与（38．7±11．8）°,t=2．61,均P〈0．05。这2个参数与LVEF均呈负相关（r=-0．785、-0．883,均P〈0．01）,而相位图偏斜和陡度与LVEF均呈正相关（r=0．755、0.666,均P〈0．01）。正常组患者LVEF高于非正常组患者：（69．3±4．7）％与（44．7±13．0）％,t=-5．65,P〈0．01;灌注缺损比例低于非正常组：4．0％与16．0％;Z=-2．23,P〈0．05;代谢缺损比例差异无统计学意义（Z=-1．82,P〉0．05）。正常组相位SD及相位图带宽显著低于非正常组,分别为（18．7±19．0）°与（44．2±31．6）°,t=2．21;（36．4±12．7）°与（82．1±45．4）°,t=3．08,均P〈0．05。相位图偏斜、陡度正常组高于非正常组-5．11±0．75与3．55±1．05,t=-3．89;30．77±10．49与15．66±10．12．t=-3．35,均P〈0．01。结论CTO患者左心室收缩同步性较健康人差,核素显像相位图同步性参数可有效预测左心室泵功能。     

运动试验心肌灌注显像诊断冠心病伴心房颤动的价值

目的评价运动试验心肌灌注显像诊断冠心病伴心房颤动（房颤）的能力。方法回顾性分析58例接受运动试验^99Tc^m-甲氧基异丁基异腈（MIBI）心肌灌注显像，且运动试验心电图示房颤心律的患者检查结果，并与冠状动脉造影结果比较。结果58例患者中，瓣膜性心脏病20例，非瓣膜性心脏病38例。运动试验心肌灌注显像诊断冠心病伴房颤患者的灵敏度、特异性和准确性分别为60％（9／15）、88％（38／43）和81％（47／58）。在非瓣膜性心脏病患者中，运动试验心肌灌注显像诊断冠心病的灵敏度和特异性分别为60％（9／15）和96％（22／23）；在瓣膜性心脏病患者中，运动试验心肌灌注显像的诊断准确性为80％（16／20）。结论运动试验心肌灌注显像诊断非瓣膜病房颤患者冠心病有中等程度的灵敏度和较高的特异性；诊断瓣膜病房颤患者冠心病有较高的准确性，但存在一定的假阳性。     

20lTl定量门控心肌灌注体层显像与99mTc-红细胞门控心血池显像测定左心室射血分数的对比研究

目的 探讨20lTl定量门控心肌灌注体层显像与99mTc-红细胞门控心血池显像测量左心室射血分数(LVEF)的相关性。方法 72例受检者接受20lTl静息门控心肌灌注体层显像,用AUTOQUANT 4.21软件测量LVEF,并与24h内的静息99mTc-红细胞平衡法门控心血池显像结果进行比较。结果 ①门控心肌灌注体层显像与门控心血池显像测量LVEF值的结果呈明显正相关(r=0.554,P=0.000),两种方法无统计学差别(t=1.194,P>0.05)。②不同疾病组之间两种测量方法无统计学差异(P值均大于0.05)。③门控心肌灌注体层显像及门控心血池显像测量的LVEF值分别为(64.68±10.77)%和(62.46±8.99)%,门控心肌灌注体层显像测量的LVEF值要比门控心血池显像高出3.55%。结论 20lTl控心肌灌注体层显像与99mTc-红细胞门控心血池显像测量LVEF值的相关性好且结果准确,但门控心肌灌注体层显像的LVEF测量值要稍高于门控心血池显像。     

负荷-静息99Tcm-MIBI门控心肌灌注断层显像相位分析评价左室缺血心肌收缩同步性

目的 以99 Tcm-MIBI门控心肌灌注断层显像(GSMPI)相位分析探讨不同缺血灌注状态下左室心肌收缩同步性.方法 回顾性分析129例[男65例,女64例,年龄48～88(68.6±10.2)岁]行99 Tcm-MIBI两日法静息-负荷GSMPI患者的心肌灌注及心功能数据.采用17节段5分制对图像进行评分,获得负荷总积分及心肌缺血积分,分为灌注正常组及灌注异常组,后者再分为可逆性灌注缺损组及固定性灌注缺损组.采用两独立样本t检验比较分析各组间GSMPI的PSD和PHB,各组内静息与负荷PSD及PHB间差异的比较采用配对t检验.结果 129例患者中,灌注正常组66例,灌注异常组63例,其中可逆性灌注缺损组39例,固定性灌注缺损组24例.灌注异常组PSD及PHB显著大于灌注正常组,分别为18.3±7.8和14.3±6.6,68.6±30.9和50.2±20.0(t=-3.110和-3.989,均P＜0.05).尽管固定性灌注缺损组的PSD和PHB较可逆性灌注缺损组有增大趋势,但差异均无统计学意义(=-1.554～-0.408,均P＞0.05);两亚组静息和负荷PSD和PHB间亦无明显差异(t=-0.961 ～-0.114,均P＞0.05).LVEF≤60％组的静息和负荷PSD(20.4±8.1和20.8±6.4)均显著大于LVEF＞ 60％组(15.0±6.8和15.3±7.0;t=3.642和3.886,均P＜0.05);LVEF≤60％组的静息和负荷PHB (77.8±53.5和78.4±26.7)也显著大于LVEF＞60％组(53.5±23.0和55.9±24.5;t=4.567和4.302,均P＜0.05).结论 99Tcm-MIBI GSMPI相位分析能够反映血流灌注异常对心肌收缩同步性的损害及由此造成的对左室整体收缩功能的影响,可在一定程度上反映不同心肌缺血状态下左室收缩同步性的差异;就99Tcm-MIBI而言,负荷和静息GSMPI相位分析对左室收缩同步性评估的价值相当.     

Evaluation of mechanical dyssynchrony and myocardial perfusion using phase analysis of gated SPECT imaging in patients with left ventricular dysfunction

Background. Using phase analysis of gated single photon emission computed tomography (SPECT) imaging, we examined the relation between myocardial perfusion, degree of electrical dyssynchrony, and degree of SPECT-derived mechanical dyssynchrony in patients with left ventricular (LV) dysfunction. Methods and Results. We retrospectively examined 125 patients with LV dysfunction and ejection fraction of 35% or lower. Fourier analysis converts regional myocardial counts into a continuous thickening function, allowing resolution of phase of onset of myocardial thickening. The SD of LV phase distribution (phase SD) and histogram bandwidth describe LV phase dispersion as a measure of dyssynchrony. Heart failure (HF) patients with perfusion abnormalities have higher degrees of dyssynchrony measured by median phase SD (45.5° vs 27.7°, P<.0001) and bandwidth (117.0° vs 73.0°, P=.0006). HF patients with prolonged QRS durations have higher degrees of dyssynchrony measured by median phase SD (54.1° vs 34.7°, P<.0001) and bandwidth (136.5° vs 99.0°, P=.0005). Mild to moderate correlations exist between QRS duration and phase analysis indices of phase SD (r=0.50) and bandwidth (r=0.40). Mechanical dyssynchrony (phase SD >43°) was 43.2%. Conclusions. HF patients with perfusion abnormalities or prolonged QRS durations have higher degrees of mechanical dyssynchrony. Gated SPECT myocardial perfusion imaging can quantify myocardial function, perfusion, and dyssynchrony and may help in evaluating patients for cardiac resynchronization therapy. (J Nucl Cardiol 2008;15:663-70.) This study was funded by a research grant from the Medtronic-Duke Strategic Alliance, and Dr Trimble is the primary investigator.     

The expanding role of left ventricular functional assessment using gated myocardial perfusion SPECT: the supporting actor is stealing the scene

Background Gating of single-photon emission computed tomography (SPECT) has significantly improved the reliability and diagnostic accuracy of myocardial perfusion imaging. The functional parameters derived from this technique, mainly left ventricular volumes and ejection fraction, have been demonstrated to be accurate and reproducible. They are able to increase the detection of severe and extensive coronary artery disease and show a significant incremental prognostic power over perfusion abnormalities. Therefore, the importance given to gated SPECT functional data has progressively grown. Discussion This circumstance has further expanded the indications for myocardial perfusion imaging and strengthened its position among the different imaging modalities. Moreover, several studies show that the evaluation of ventricular function may have a leading part in justifying the execution of perfusion scintigraphy in various clinical conditions. Aim Aim of this review is to describe this evolution of gated SPECT functional assessment from a supporting rank with respect to perfusion, to a main actor position in the field of cardiac imaging.     

Relationship between left ventricular function and wall motion synchrony in heart failure assessed by ECG-gated myocardial perfusion SPECT

Objective  To confirm the relationship between left ventricular (LV) function and wall motion synchrony, and to identify the difference of synchrony between an ischemic heart disease (IHD) patient group and other heart disease (OHD) patient group among classified groups in heart failure, systolic, and diastolic parameters were compared using electrocardiograph-gated single-photon emission computed tomography. Methods and results  Twenty IHD and 30 OHD patient groups, comprised New York Heart Association functional class I–III (IHD1-3 and OHD1-3), and 15 controls were examined. The LV functions (ejection fraction, EF; peak-filling rate, PFR) and synchrony, which was estimated from the time lag between the earliest and latest regional systolic or diastolic temporal parameters (maximum difference of regional time to end-systole, MD-TES, or maximum difference of regional time to peak filling, MD-TPF), were compared. The LV function correlated with its synchrony in IHD and OHD (EF vs. MD-TES: r = −0.86, P = 1.3 × 10⁻⁶ in IHD and r = −0.69, P = 2.8 × 10⁻⁵ in OHD. PFR versus MD-TPF: r = −0.67, P < 0.002 in IHD and r = −0.63, P < 0.0002 in OHD). Dyssynchronous normal EF was observed in three IHD (15%) and six OHD (20%). Dyssynchronous normal PFR was observed in six IHD (30%) and six OHD (20%). MD-TES was significantly smaller in control group (CG) than in IHD3 and OHD3 (P < 0.005), and in IHD1 than in IHD3 and OHD3 (P < 0.05). MD-TPF was significantly smaller in CG than in IHD2, IHD3, and OHD3 (P < 0.05). However, there was no significant difference between LV synchrony in IHD and OHD, or among LV synchrony of the same functional classes between these two groups. Conclusions  This study confirms that LV function is correlated with wall motion synchrony. No statistically significant difference was confirmed in wall motion synchrony between IHD and OHD. However, dyssynchrony appears in the patients without apparent global LV dysfunction. This feature may facilitate identification of synchronous disorder in HF patients with preserved global LV function. It is expected that detection of such a disorder may lead to the initiation of appropriate treatments for early stage HF and prevent its progression.     

Assessment of left ventricular mechanical dyssynchrony by phase analysis of ECG-gated SPECT myocardial perfusion imaging

Cardiac resynchronization therapy (CRT) has shown benefits in patients with severe heart failure. However, at least 30% of patients selected for CRT by use of traditional criteria (New York Heart Association class III or IV, depressed left ventricular [LV] ejection fraction, and prolonged QRS duration) do not respond to CRT. Recent studies with tissue Doppler imaging have shown that the presence of LV dyssynchrony is an important predictor of response to CRT. Phase analysis has been developed to allow assessment of LV dyssynchrony by gated single photon emission computed tomography myocardial perfusion imaging. This technique uses Fourier harmonic functions to approximate regional wall thickness changes over the cardiac cycle and to calculate the regional onset-of-mechanical contraction phase. Once the onset-of-mechanical contraction phases are obtained 3-dimensionally over the left ventricle, a phase distribution map is formed that represents the degree of LV dyssynchrony. This technique has been compared with other methods of measuring LV dyssynchrony and shown promising results in clinical evaluations. In this review the phase analysis methodology is described, and its up-to-date validations are summarized.     

Evaluation of left ventricular mechanical dyssynchrony as determined by phase analysis of ECG-gated SPECT myocardial perfusion imaging in patients with left ventricular dysfunction and conduction disturbances

Background  Cardiac resynchronization therapy (CRT) is approved for the treatment of patients with advanced systolic heart failure and evidence of dyssynchrony on electrocardiograms. However, a significant percentage of patients do not demonstrate improvement with CRT. Echocardiographic techniques have been used for more accurate determination of dyssynchrony. Single photon emission computed tomography (SPECT) myocardial perfusion imaging has not previously been used to evaluate cardiac dyssynchrony. The objective of this study is to evaluate mechanical dyssynchrony as described by phase analysis of gated SPECT images in patients with left ventricular dysfunction, conduction delays, and ventricular paced rhythms. Methods and Results  A novel count-based method is used to extract regional systolic wall thickening amplitude and phase from gated SPECT images. Five indices describing the phase dispersion of the onset of mechanical contraction are determined: peak phase, phase SD, bandwidth, skewness, and kurtosis. These indices were determined in consecutive patients with left ventricular dysfunction (n=120), left bundle branch block (n=33), right bundle branch block (n=19), and ventricular paced rhythms (n=23) and were compared with normal control subjects (n=157). Phase SD, bandwidth, skewness, and kurtosis were significantly different between patients with left ventricular dysfunction, left bundle branch block, right bundle branch block, and ventricular paced rhythms and normal control subjects (all P<.001) Peak phase was significantly different between patients with right ventricular paced rhythms and normal control subjects (P=.001). Conclusions  A novel SPECT technique for describing left ventricular mechanical dyssyn-chrony has been developed and may prove useful in the evaluation of patients for CRT. This study was funded in part by a research grant from the Medtronic-Duke Strategic Alliance, of which Dr Borges-Neto is the primary investigator.     

Stress-related variations in left ventricular function as assessed with gated myocardial perfusion SPECT

BACKGROUND: There is inconsistency in reported patient characteristics associated with differences in basal and poststress left ventricular function (delta ejection fraction [DeltaEF]) assessed by gated single photon emission computed tomography (SPECT). This inconsistency may therefore hamper adequate interpretation. In this study we first determined the reproducibility of serial gated SPECT-assessed left ventricular function. Second, we determined whether left ventricular ejection fraction (LVEF) assessed directly after stress reflects basal LVEF and, if not, what patient characteristics were associated with this discrepancy in LVEF. METHODS AND RESULTS: Serial reproducibility of technetium 99m tetrofosmin gated SPECT-assessed LVEF in 22 patients showed a mean difference between two sequential measurements at rest of 0.09% EF units, with a 95% limit of agreement (2 SDs) at 5.8% EF units. In 229 patients Tc-99m tetrofosmin gated SPECT was performed after stress and at rest. Independent predictors of DeltaEF were the presence of scintigraphically proven ischemia (standardized coefficient, -1.256; P =.003) and difference in heart rate at the time of acquisition (standardized coefficient, 0.121; P =.001). CONCLUSIONS: Gated SPECT-assessed LVEF at rest is reproducible under standard clinical conditions. However, LVEF assessed after stress does not represent LVEF at rest in patients with scintigraphically proven ischemia and in patients with increased heart rate after stress compared with heart rate at rest.     

Day-to-day variability of global left ventricular functional and perfusional measurements by quantitative gated SPECT using Tc-99m tetrofosmin in patients with heart failure due to coronary artery disease

BACKGROUND: Although myocardial gated single photon emission computed tomography (SPECT) is routinely used for functional measurements in patients with coronary artery disease (CAD) and heart failure, day-to-day variability of left ventricular ejection fraction (LVEF), left ventricular (LV) volumes, and global perfusion scoring has not yet been investigated. METHODS AND RESULTS: In 20 consecutive patients with CAD and an LVEF lower than 40% who routinely underwent a resting tetrofosmin gated SPECT study, we performed an additional gated SPECT study at rest 1 to 5 days later under the same circumstances. LV volumes and LVEF were calculated from the gated SPECT data by commercially available software (QGS). Myocardial perfusion was scored visually by use of a 20-segment, 5-point scoring method. For global LV function and perfusion, agreement between data was investigated by use of Bland-Altman plotting. The 95% limits of agreement found by Bland-Altman analysis were -0.9% +/- 6.0% for LVEF, 3 +/- 20 mL for LV end-diastolic volume, and 4 +/- 20 mL for LV end-systolic volume. CONCLUSION: In CAD patients with an LVEF lower than 40%, day-to-day variability of measurements of global myocardial function and perfusion is quite similar to interobserver and intraobserver variability. Day-to-day variability of global LV functional parameters obtained by gated cardiac SPECT is fairly small, which indicates that myocardial gated SPECT can be used in daily clinical practice to determine changes in global LV function and perfusion over time in patients with diminished LV function.     

心力衰竭患者左室Tei指数与左室收缩功能的相关性分析

目的 探讨心力衰竭患者左室Tei指数、左室收缩功能指标二者相关性.方法 应用脉冲多普勒超声测量104例左心衰竭患者的左室Tei指数,运用实时三维超声心动图测量104例左心衰竭患者的左心室舒张末期容积(LV-EDV)、左心室收缩末期容积(LVESV)及射血分数(LVEF),分析心力衰竭患者Tei指数与LVEDV、LVESV及LVEF的相关性.结果 左心衰竭患者Tei指数与LVEDV和LVESV有较好的正相关性(r=0.634,P=0.000;r=0.788,P=0.000),与LVEF有较好的负相关性(r=-0.758,P=0.000).结论 左心衰竭患者左室Tei指数、左室收缩功能指标二者为密切相关,联合应用为准确评价左心衰患者左室整体功能提供有价值的信息.     

实时三维超声心动图评价尿毒症性心肌病左心室收缩功能及同步性

目的:探讨实时三维超声心动图(RT-3DE)评价尿毒症性心肌病(UM)患者左心室收缩功能及其同步性的应用价值。方法:①对30例尿毒症性心肌病患者和20例正常对照组采用RT-3DE采集其左心室容积和射血分数,同时应用二维超声心动图Si mpson法、M型Teichholz法进行检测,将三种方法所测的数据与磁共振显像技术所测的数据进行比较;②RT-3DE检查获取左心室全容积图像,应用QLAB4.2软件分析左心室17节段达到收缩期最小容积点时间(Tmsv)的标准差(Tmsv16-SD、Tmsv12-SD和Tmsv6-SD)及最大时间差(Tmsv16-Dif、Tmsv12-Dif和Tmsv6-Dif),对标准差及最大时间差行心率校正。结果:①UM组Teichholz法、Si mpson法所测LVEDV和LVESV均高于或低于RT-3DE测值,其差异均有统计学意义(P0.05);②正常组与UM患者16节段、12节段(中间段和基底段)和6节段(基底段)Tmsv的标准差和最大时间差值均有显著性差异,UM组均大于正常组(P0.05或P0.01)。结论:①在UM患者中,RT-3DE法的左室容积及射血分数数据准确性高;②RT-3DE为临床评价UM患者左心室收缩同步化及收缩功能提供了更加快速、简便、准确及无创性的新方法。