心肌梗死患者T波峰-末间期等复极参数的立体心电向量评价

目的应用立体心电向量（3D-VCG）技术,对正常人和心肌梗死患者的T波峰-末间期（Tp-Te）及其他复极参数进行对比研究。方法采用3D-VCG技术,分别测量109例心肌梗死和116例正常人的Tp-Te、T环总时间和T环最大振幅参数,比较组间差异性。结果心肌梗死组Tp-Te较正常组显著延长[（114.26±27.54）ms vs（100.40±13.61）ms,P〈0.05）],T环总时间两组差异不大[（238.70±40.20）ms vs（241.00±38.25）ms,P〉0.05],而心肌梗死组T环最大振幅显著减小[（0.39±0.17）mV vs（0.64±0.23）mV,P〈0.001]。结论 3D-VCG显示心肌梗死患者复极参数异常,Tp-Te延长提示其跨室壁复极离散度增加。     

应用明胶海绵栓塞法建立猪的心肌梗死模型

目的经心导管用明胶海绵栓子栓塞猪的冠状动脉左前降支(LAD),建立心肌梗死的大动物模型。方法对7头猪用明胶海绵经导管栓塞LAD第二对角支远端,致前室壁梗死。四周后行心脏超声、冠状动脉造影及组织学检查。结果手术死亡率为1/7。与对照组相比,心肌梗死(MI)组左室舒张未内径(LVEDd)增大由37.0mm±3.4mm增至50.8mm±6.1mm(P<0.01),射血分数(EF)由62.3%±2.9%下降为36.6%±2.1%(P<0.001);复查冠脉造影提示LAD栓塞仍存在。MI组的左室被动容积为81.4ml±4.3ml,梗死区面积/左室心肌面积为18.4%±1.6%,梗死区厚3.5mm±0.8mm。心肌组织马森染色显示梗塞交界区有大块纤维形成,梗塞区有片状纤维形成。结论这种模型接近临床病理生理过程,稳定可靠,重复性好,可作为研究心肌梗死的技术平台。     

Transplanted human umbilical cord blood mononuclear cells improve left ventricular function through angiogenesis in myocardial infarction

Background Human umbilical cord blood contains an abundance of immature stem/progenitor cells, which may participate in the repair of hearts that have been damaged by myocardial infarction (MI). This study aimed to evaluate the effects of human umbilical cord blood mononuclear cells (hUCBC) transplantation on cardiac function and left ventricular remodeling in rat model of MI. Methods Forty-five male Wistar rats were randomized into three groups: MI or control group (n=15), MI plus cell transplantation (n=15), and sham group (n=15). Acute myocardial infarction (AMI) was established by ligating the left anterior descending artery, thereafter, hUCBC were implanted into the marginal area of infarcted myocardium. In MI/control group, DMEM was injected instead of hUCBC following the same protocol. Left ventricular function assessment was carried out by echocardiography and invasive hemodynamic measurements one month post MI. All rats were sacrificed for histological and immunochemical examinations. Results The transplanted hUCBC survived and engaged in the process of myocardial repair in the host heart. Echocardiography demonstrated that left ventricular function improved significantly in the rats that underwent cell transplantation. Hemodynamic studies found a significantly decreased left ventricular end-diastolic pressure (LVEDP) [(21.08±8.10) mmHg vs (30.82±9.59) mmHg, P&lt;0.05], increase in +dp/dt(max) [(4.29±1.27) mmHg/ms vs (3.24±0.75) mmHg/ms, P&lt;0.05), and increase in －dp/dt(max) [(3.71±0.79) mmHg/ms vs (3.00±0.49) mmHg/ms, P&lt;0.05] among MI group with hUCBC transplantation when compared with MI/control group. Masson’s trichrome staining revealed that the collagen density in the left ventricle was significantly lower in rats of transplantation group than that in the MI control groups [(6.33±2.69)% vs (11.10±3.75)%, P&lt; 0.01]. Based on immunostaining of α-actin, the numbers of microvessels were significantly (P&lt;0.01) increased at the boundary of infarction site. Similarly higher mRNA expression of vascular endothelial growth factor (VEGF) 164 and VEGF188 were found at 7- and 28-day post cell transplantation in MI group with hUCBC transplantation when compared with MI/ control group.Conclusions Transplanted hUCBC can survive in host myocardium without immunorejection, significantly improve left ventricular remodeling after AMI and promote a higher level of angiogenesis in the infarct zones. All these factors beneficially affect cardiac repair in the setting of MI. Therefore human umbilical cord blood may be potential source for cell-based therapy for AMI.     

通心络胶囊对兔心肌梗死后心肌微循环、心功能及心电生理的影响

目的探讨通心络胶囊对兔心肌梗死后心脏微循环灌注、心功能及心电生理的影响。方法选取新西兰大耳白兔24只,随机分成假手术组、心肌梗死组及通心络组,每组8只。通过结扎左冠状动脉前降支建立心肌梗死模型,假手术组除不结扎动脉之外,其余均同心肌梗死组与通心络组。从术后第1天开始,通心络组给予通心络超微粉0.4 g·kg^(-1)·d(-1)·d^(-1)灌胃;假手术组与心肌梗死组给予等量的生理盐水灌胃,连续8周。分别在术后2、4周后,应用实时心肌超声造影检测梗死后心肌的微循环灌注情况。在术后8周,3组均利用超声心动图检测心功能,并进行在体电生理检测,测量梗死周边区的心肌内、中、外膜MAPD_(90)、跨室壁复极离散度(TDR)、有效不应期(ERP)和室颤阈值(VFT)。结果与心肌梗死组比较,通心络组显著改善梗死相关区域的微循环灌注,心肌血流量明显提高[2周后:(7.24±1.11)dB×s(-1)灌胃;假手术组与心肌梗死组给予等量的生理盐水灌胃,连续8周。分别在术后2、4周后,应用实时心肌超声造影检测梗死后心肌的微循环灌注情况。在术后8周,3组均利用超声心动图检测心功能,并进行在体电生理检测,测量梗死周边区的心肌内、中、外膜MAPD_(90)、跨室壁复极离散度(TDR)、有效不应期(ERP)和室颤阈值(VFT)。结果与心肌梗死组比较,通心络组显著改善梗死相关区域的微循环灌注,心肌血流量明显提高[2周后:(7.24±1.11)dB×s^(-1)vs.(10.66±1.23)dB×s(-1)vs.(10.66±1.23)dB×s^(-1),P<0.05;4周后:(7.23±0.81)dB×s(-1),P<0.05;4周后:(7.23±0.81)dB×s^(-1)vs.(11.12±1.73)dB×s(-1)vs.(11.12±1.73)dB×s^(-1),P<0.05)。术后8周与心肌梗死组比,通心络组明显改善心肌梗死后心功能、延缓心肌梗死后心力衰竭发展进程、增加左室射血分数(FS:0.25±0.02 vs.0.30±0.02;LVEF:0.51±0.04 vs.0.61±0.03,P<0.05);缩短梗死周边区心肌MAPD_(90)[内膜:(170.65±7.64)ms vs.(159.01±5.48)ms;中膜:(169.34±6.35)ms vs.(160.32±5.46)ms;外膜:(167.16±5.72)ms vs.(156.74±4.43)ms,P<0.05],缩小TDR[(7.72±2.83)ms vs.(4.95±2.26)ms,P<0.05];延长ERP[(126.56±5.87)ms vs.(135.25±5.63)ms,P<0.05],增加VFT[(28.63±6.21)V vs.(44.75±13.73)V,P<0.05]。结论通心络明显改善心肌梗死后梗死相关区微循环灌注,同时改善心肌梗死后心功能;对心肌梗死后心脏的电生理具有重要的影响,可能具有潜在的抗心律失常作用。     

Beneficial effects of early coronary reperfusion on left ventricular remodeling and systolic function in patients with acute myocardial infarction.

OBJECTIVE: To evaluate the beneficial effects of early coronary reperfusion on left ventricular remodeling (LVRM) and systolic function in patients with acute myocardial infarction (AMI). METHODS: Eighty-one patients with first AMI in the convalescent stage and having undergone left ventriculography (LVG) and coronary arteriography (CAG) were divided into four groups: the anterolateral wall (ALW) myocardial infarction (MI) non-reperfusion (n = 20) and reperfusion (n = 21), and inferoposterial wall (IPW) MI non-reperfusion (n = 20) and reperfusion (n = 20), according to infarct location and early treatment with or without successful coronary reperfusion therapy within 6 hours after onset of symptoms. By LVG, the parameters of LVRM and systolic function in the four MI groups were analyzed and compared with those in normal group (n = 25) and between the two reperfusion and non-reperfusion MI groups. RESULTS: In both ALW and IPW MI non-reperfusion groups, the left ventricular (LV) end-diastolic volume (EDV), circumference (EDC), short-axis dimension (EDD), short to long axis ratio (ED-D/L), sphericity index (ED-SI) and end-systolic volume (ESV) were all significantly increased (P < 0.01-0.001), while LV ejection fractions (LVEF) were significantly decreased (both P < 0.001) when compared with those of normal group; and the increase in ESV and decrease in LVEF were both significantly greater in ALW than in IPW MI groups (both P < 0.01). In both ALW and IPW MI reperfusion groups, however, the EDV, EDD, ESV, as well as the extent and severity of regional wall motion abnormality (RW-MA) were significantly smaller (P < 0.05-0.001), while LVEF were significantly higher (P < 0.01-0.001) when compared with those in the two non-reperfusion MI groups respectively. There were no longer significant differences in LVEF and ESV between ALW and IPW MI groups (both P > 0.05). The EDC in IPW MI reperfusion group and the ED-D/L and ED-SI in ALW MI reperfusion group were also significantly reduced compared with those in the two non-reperfusion MI groups respectively (P < 0.05-0.001). All the above parameters in the two reperfusion MI group were decreased to the normal in comparison with normal group except ESV and LVEF, and ED-D/L and ED-SI in IPW MI group. CONCLUSION: It was indicated that in both ALW and IPW MI non-reperfusion groups, LVRM had occurred in convalescent stage of AMI with an increase in EDV and EDC, spherical change in LV shape, and accompanying reduction in LV systolic function; and early coronary reperfusion in AMI could reduce the extent and severity of RWMA, prevent from LV enlargement and remodeling, and preserve or improve LV systolic function with more prominence in ALW MI.     

心尖搏动图对陈旧性心肌梗塞患者左室舒张功能参数的对比分析

用心尖搏动图对52例陈旧性下壁心肌梗塞、47例陈旧性前间壁心肌梗塞、53例陈旧性广泛前壁心肌梗塞与50例正常对照组的左室舒张功能参数对比分析,结果显示:陈旧性心肌梗塞病人的TRTI、A/D比值、DATL、A/H、RFT、AST均值有显著或非常显著差异(P<0.05,P<0.01)。陈旧性心肌梗塞组间比较,广泛前壁心肌梗塞的A/D、SFT、AST均值有显著/或非常显著差异(P<0.05,P<0.01)。表明陈旧性心肌梗塞舒张功能异常及AST延长的代偿性改变。     

心肌梗死后浦肯野纤维电生理特性的异常改变

目的:观察心肌梗死(MI)后浦肯野纤维电生理特性的改变。方法:MI组结扎左冠状动脉造成MI模型,2d后取出左心室假腱索(n=30)置于模拟缺血缓冲液中用玻璃微电极测定动作电位90%复极时间(APD90)和有效不应期(ERP),并观察后除极(AD)和其他电生理现象。对照组不结扎冠状动脉直接取出左心室假腱索(n=30)置于正常Tyrode’s液中观测上述指标。结果:慢频率刺激时,MI组APD90明显短于对照组[心动周期(CL)=800ms,(247.4±20.5)ms比(284.6±13.4)ms,P<0.05;CL=500ms,(246.7±15.3)ms比(268.4±17.8)ms,P<0.05]。MI组ERP明显短于对照组[(207.1±18.3)ms比(232.3±17.6)ms,P<0.05]。CL=200ms和300ms时,MI组27根假腱索观察到迟后除极(DAD);CL=200ms,MI组30根假腱索均出现动作电位(AP)交替现象。Ryanodine全面抑制MI组假腱索的DAD和AP交替现象。结论:MI后假腱索DAD和AP交替现象与浦肯野细胞钙调控异常有关,且可能有潜在的致心律失常作用。     

二维应变成像评估小鼠急性心肌梗死后局部心肌功能不全

目的:探讨基于斑点追踪的二维应变成像技术评估小鼠急性心肌梗死后局部心肌功能不全的应用价值?方法:20只C57/B6小鼠随机分成两组:急性心肌梗死组(10只)和假手术组(10只)?所有小鼠均于术后3 d行超声心动图检查?应用EchoPac工作站分析左室乳头肌短轴切面高帧频图像,测量各节段收缩期峰值径向应变(peak radical strain,PRS)及应变率(peak radical strain rate,PRSR),并用解剖M型超声测量左室舒张末期内径(LVIDd)及收缩末期内径(LVIDs)?左室舒张末容积(LVVd)?左室收缩末容积(LVVs)?射血分数(EF)和左室缩短率(FS)?结果:与假手术组相比,小鼠心肌梗死组LVIDd?LVIDs?LVVd?LVVs测值升高,EF?FS测值下降,差异有统计学意义(P < 0.01);与假手术组相比,小鼠心肌梗死组各节段心肌PRS测值及PRSR测值均明显降低,差异有统计学意义(P < 0.01);心肌梗死手术组前间隔?前壁?侧壁PRSR较其他节段心肌明显降低,差异有统计学意义(P < 0.05)?结论:二维超声应变成像技术可以准确量化评估小鼠急性心肌梗死后局部心肌功能不全?     

心肌梗死后区域性神经支配异常及其对心室复极影响的实验研究

目的探讨心肌梗死后是否存在区域性自主神经分布不均现象,评价交感神经刺激对心脏不同区域心室复极的影响。方法将14只犬随机分为心肌梗死组(7只)与假手术对照组(7只),心肌梗死组手术结扎冠状动脉前降支主干造成左心室前侧壁心肌梗死模型。术后4周应用程序刺激测定梗死区近端心底部及远端心尖部梗死比邻部位的有效不应期(ERP),假手术对照组取心肌梗死组对应部位进行检测。刺激左星状神经节后重复测定上述部位的ERP。应用免疫组织化学技术检测电生理电极所在部位的交感神经支配情况。结果心肌梗死组未给予左星状神经节刺激时,梗死区近端心底部的梗死比邻部位ERP值(162ms±9ms)与梗死区远端心尖部的梗死比邻部位ERP值(161ms±6ms)相比,差异无统计学意义(P>0.05),这与假手术对照组相似(162ms±10ms比164ms±5ms,P>0.05);但在给予交感神经刺激后,仅心肌梗死组心尖部位的ERP值无明显变化,其他被测区域均出现ERP值缩短现象,心肌梗死组呈现心底部(141ms±10ms)与心尖部(157ms±8ms)之间心室复极离散(P<0.05)。心肌梗死组心尖部电极所在部位交感神经免疫组织化学染色阴性,心底部及假手术对照组均可见正常的免疫染色阳性的神经纤维分布。结论心肌梗死后心脏局部存在区域性失神经支配现象;自主神经异常分布导致神经刺激后心室复极离散的发生。     

Intracoronary adenosine improves myocardial perfusion

Background Myocardial perfusion associates with clinical syndromes and prognosis. Adenosine could improve myocardial perfusion of acute myocardial infarction within 6 hours, but few data are available on late perfusion of myocardial infarction （MI）. This study aimed at quantitatively evaluating the value of intracoronary adenosine improving myocardial perfusion in late reperfused MI with myocardial contrast echocardiography （MCE）.
Methods Twenty-six patients with anterior wall infarcts were divided randomly into 2 groups： adenosine group （n=12） and normal saline group （n=-14）. Their history of myocardial infarction was about 3-12 weeks. Adenosine or normal saline was given when the guiding wire crossed the lesion through percutaneous coronary intervention （PCI）, then the balloon was dilated and stent （Cypher/Cypher select） was implanted at the lesion. Contrast pulse sequencing MCE with Sonovue contrast via the coronary route was done before PCI and 30 minutes after PCI. Video densitometry and contrast filled-blank area were calculated with the CUSQ off-line software. Heart function and cardiac events were followed up within 30 days.
Results Perfusion in the segments of the criminal occlusive coronary artery in the adenosine group was better than that in the saline group （5.71：L-0.29 VS 4.95±1.22, P〈0.05）. Ischemic myocardial segment was deminished significantly after PCI, but the meliorated area was bigger in the adenosine group than in the saline group （（1.56±0.60） cm^2 vs （1.02±0.56） cm^2, P〈0.05）. The video densitometry in cntical segments was also improved significantly in the adenosine group （5.53±0.36 VS 5.26±0.35, P〈0.05）. Left ventricular ejection fraction （LVEF） was improved in all patients after PCI, but EF was not significant between the two groups （（67±6）% vs （62±7）%, P〉0.05）. There was no in-hospital or 30-day major adverse cardiac event （MACE） in the adenosine group but 3 MACE in the saline group in 30 days after     

大脑颞横回立体定位数据集的构建及投影回归分析

目的构建大脑颞横回基于连合间径（AC-PC）定位体系中的立体定位数据集及其平面投影回归方程。方法将30名健康成年人颅脑横断层磁共振数据经格式转化导入Photoshop CS软件包,经过严格的图像配准,建立以AC-PC中点为原点的三维立体坐标系,从颞横回最内侧点为起始点,向外测量、记录该点坐标的X、Z值,Y值为所在层面图像距离AC-PC平面的层数与层间距的乘积,所有取样点坐标值构成颞横回在三维坐标系中的立体定位数据集。利用Excel表格对所获得的数据作投影散点图,利用SPSS 22.0统计软件求得其在横、矢、冠状面上的空间拟合平面回归方程。结果男性颞横回左右侧X坐标值差异无统计学意义（P>0.05）,Z坐标值左右两侧差异有统计学意义（P < 0.05）;女性颞横回左右侧X、Z坐标值标左右两侧之间差异均无统计学意义（P>0.05）。大脑颞横回内侧缘在横断上Y值对X值的回归方程右侧:$ \mathop Y\limits^ \wedge $=29.3-6.48X+0.25X2-0.002 5X3（P < 0.01）,左侧:$ \mathop Y\limits^ \wedge $=-108-4.73X-0.05X2（P < 0.01）;大脑颞横回内侧缘在矢状面上Z值对Y值的回归方程右侧:$ \mathop Z\limits^ \wedge $=-0.8-0.35Y-0.004Y2（P < 0.01）,左侧:$ \mathop Y\limits^ \wedge $=0.1-0.2Y+0.008 64Y2-0.000 569Y3（P < 0.01）;大脑颞横回内侧缘在冠状面上Z值对X值的回归方程右侧:$ \mathop Z\limits^ \wedge $=54.8-2.63X+0.03X2（P < 0.01）,左侧:$ \mathop Z\limits^ \wedge $=58.9+2.82X+0.03X2（P < 0.01）。结论构建大脑颞横回立体定位数据集及直线回归方程,对颞横回及其邻近区域疾病的立体定向神经外科和介入放射等治疗方法有较大的临床应用价值,同时对于揭示大脑颞横回的形态学规律有重要的意义。     

99mTc-MIBI心肌灌注断层显像评价心肌梗死后左室重构

目的：压用^99mTc-甲氯异丁基异腈（MIBI）心肌灌注显像对左室重构进行半定量评估。方法：随机从^99mTc-MIBI心肌灌注显像库中抽取心肌梗死患者55例．其中前壁组25例，下后壁组30例；正常对照组30例。采用自编软件测定前壁或下后壁梗死部位局部膨出指标EG／EF或FG／EF值、左室心肌梗死后球形化指标EF／AB值．结果：前壁组EG/EF值明显高于正常组．下后壁组FG／EF值与正常组无明显差别．前壁组、下后壁组EF/AB值均明显高于正常组．前壁组EF／AB值明显高于下后壁组．结论：心肌灌注断层显像的半定量指标EG／EF、FG／EF和EF/AB可用于心肌梗死后左室重构的评价．     

大脑额下沟断层解剖学相关性研究

目的探讨健康右利手成人额下沟的形态学特征及其侧别差异与性别差异,为Broca区功能研究提供解剖学参考。方法对40名健康右利手成人头颅MRI的横断面、冠状面及矢状面断层图像的80侧额下沟进行统计分析,研究额下沟的侧别差异及性别差异。结果不同性别情况下,额下沟在横断面出现层数差异无统计学意义（P>0.05）。女性右侧额下沟Y值均大于左侧,但除Z=18 mm层面外（P < 0.01）,各层面左右侧Y值差异均无统计学意义（P>0.05）。男性左、右侧额下沟X值均大于女性,在右侧Z=2~10 mm、14~16 mm、20~26 mm层面,左侧Z=2 mm、10~16 mm、24~30 mm层面,男女X值差异均有统计学意义（P < 0.05~P < 0.01）。在左侧Z=18~20 mm和Z=24 mm层面,男性额下沟Y值均大于女性（P < 0.01）,其他各层面男女性左侧Y值差异均无统计学意义（P>0.05）。结论额下沟在越靠近大脑中轴处,后天发育变异度越小,额下沟在前后方向及左右方向变异度大。     

急性心肌梗塞的P向量环分析

对８４例急性心肌梗塞（ＡＭＩ）心电向量图（ＶＣＧ）Ｐ环进行分析。结果：ＡＭＩ患者，特别是梗塞范围较大者，Ｐ环可以发生一系列变化；ＶＣＧＨ面Ｐ环最大向量振幅及最大向后向量或（和）最大向左向量振幅增大，负值Ｐ向量角增大，Ｐ环运行时间增加，Ｐ环运转方向也可以发生改变。上述Ｐ环变化是因为ＡＭＩ时心脏泵血功能骤减引起相应的左心房扩张造成的心房电学变化。提示：急性心肌梗塞Ｐ环异常与左心早期功能不全有关。     

丝裂素活化蛋白激酶在心肌细胞肥大中的作用

目的：研究神经肽Ｙ（ＮＰＹ）在高血压心肌细胞肥大中的作用。方法：复制腹主动脉狭窄和高盐摄入性高血压大鼠模型。测定对照组和高血压血浆、心肌ＮＰＹ水平和心肌丝裂素活化蛋白激酶（ＭＡＰＫ）活性。结果：高血压大鼠心重、ＮＰＹ水平和心肌ＭＡＰＫ活性均较显著高于对照组（Ｐ〈０．０５或Ｐ〈０．０１）。心肌ＭＡＰＫ活性与左心室肥大程度呈正相关（ｒ＝０．８０９，Ｐ〈０．０１）。结论：ＭＡＰＫ系统可能在ＮＰＹ致心肌细     

辛伐他汀对心肌梗死后心肌骨桥蛋白表达的影响及其与心室功能的相关性

目的 在大鼠心肌梗死模型上,观察辛伐他汀是否下调OPN mRNA及蛋白表达,及其与改善大鼠心肌梗死后心室重塑和心脏功能的关系.方法 制备MI模型,予辛伐他汀干预.分为3组:Sim组、MI组及假手术组.4周后分别测定左、右心室质量指数,血流动力学指标,HE染色观察心肌组织病理学改变,运用免疫组化、RT-PCR方法检测OP...     

Quantitative assessment of regional wall motion abnormalities with 2DE in cases of myocardial infarction.

The severity, extent and localization of regional wall motion abnormalities (RWMA) were quantitatively assessed with apical biplane two-dimensional echocardiography (2DE) using a fixed-axis system, ten-segment division area method in 56 patients with old myocardial infarction (OMI). RWMA were found to be more severe in the anterior wall MI (AWMI) group than in the inferoposterior wall MI (IWMI) group and most severe in the extensive AWMI with ventricular aneurysm (EAWMI with VA) group; the extent of RWMA was smallest in the IWMI group, significantly larger in the AWMI group, and largest in the EAWMI with VA group. The location of the RWMA segments showed group-specific tendencies. For example, both coronal and sagittal apices were much more frequently involved in both the EAWMI with VA and the AWMI groups than in the IWMI group (100%, 87% and 0%, respectively, all P < 0.001). The results demonstrated that quantitative analysis of RWMA using 2DE in cases of MI is accurate and feasible.     

大脑海马沟立体定位数据集的构建及投影回归分析

目的构建大脑海马沟基于连合间径(AC-PC)定位体系中的立体定位数据集及其平面投影回归方程。方法将30名健康成年人颅脑横断层MRI数据经格式转化导入Photoshop CS软件包,经过严格的图像配准,建立以AC-PC中点为原点的三维立体坐标系,获取海马沟在脑MRI冠状面图像上的三维立体坐标值,以海马沟的最外侧点为起始点,记录该点坐标的X、Z值,其在软件的信息面板中直接显示,Y值为该图像所在层面与AC-PC层面间隔的层数乘以层间距,所有取样点坐标值构成大脑海马沟在三维坐标系中的立体定位数据集。利用SPSS25.0对所获取的取样点数据进行统计处理,求解其投影回归方程。结果成功构建大脑海马沟在在三维坐标系中的立体定位数据集及其在横断、矢状、冠状面上的投影回归方程。冠状面上Z值对X值回归方程,右侧: Z=-46.379-0.302X(P < 0.05), 左侧: Z=-49.512+0.425X(P < 0.05);横断面上Y值对X值回归方程,右侧: Y=-0.380-0.198X(P>0.05), 左侧: Y=2.982+0.106X(P>0.05);矢状面上Z值对Y值回归方程,右侧Z=-38.501+0.416Y(P < 0.01), 左侧: Z=-36.793+0.326Y(P < 0.01)。结论大脑海马沟横断、冠状及矢状面的三维坐标值间的相关关系较不密切。构建的海马沟立体定位数据集可为海马区域病灶定位及该区域脑立体定向手术的靶点确定、手术路径规划提供精确的影像解剖学数据。     

用高分辨叠加检测冠心病室性心律失常QRS起始部电位异常改变

用自组的多段式心电高分辨叠加检查系统,检测30例正常人、80例冠心病患者、40例冠心病合并频发室早患者、20例冠心病合并室速患者,并对QRS波群及S-T段逐组分析。结果是4组观察对象的QRS间期、起始部振幅、起始部峰迹均有显著性差异,P<0.01。心室碎裂电位的出现在4组中差异显著,P<0.005;冠心病合并室早、室速的血液动力学比率与QRS起始部振幅呈中度负相关,r=-0.51;冠心病合并心梗患者的常规12导联ECGQ波数与SAECG的QRS起始部振幅无关,r=0.27;14例下壁心梗中8例起始部振幅减小,而20例下壁心梗中19例起始部振幅减小,P<0.01。     

老年陈旧性心肌梗塞运动试验后Q—Tc离散度的临床意义

目的：评价运动试验后Ｑ－Ｔｃ离散度在老年陈旧性心肌梗塞中的临床意义。方法：地６４例老年陈旧性心肌梗塞患者（心梗组）进行活动平板运动试验、２４ｈ动态心电图、超声心动图检测及临床随访平均２４．１２±７．７月;并以３０例健康老年人为对照组。结果：心梗组运动试验前为Ｑ－Ｔｃｄ（４０．２１±１５．２１）ｍｓ,运动试验后为（５９．３±２０．１７）ｍｓ;对照组Ｑ－Ｔｃｄ运动试验前、后比较差异均无显著性;两组Ｑ－