急性心肌梗死患者血浆脑钠尿肽动态演变的临床意义

为探讨急性心肌梗死患者血浆脑的尿肽动态演变的临床意义,将急性心肌梗死患者分为氯沙坦组、依那普利组及急性心肌梗死对照组,采用放射免疫法测定血浆脑钠脲肽水平,并与健康对照组比较;超声心动图测定左室舒张末容积指数和左室收缩末容积指数。结果发现,急性心肌梗死患者血浆脑钠尿肽水平较健康对照组升高（P＜0．01）,急性心肌梗死对照组5、14天脑钠尿肽较入院即刻进一步升高（P＜0．05）,而依那普利及氯沙坦组5、14天血浆脑钠尿肽下降。前壁急性忙肌梗死患者血浆脑钠尿肽高于下壁,再灌注者脑钠尿肽低于非再灌注者。5天及14天时血浆脑钠尿肽与左室舒张末容积指数、左室收缩末容积指数及血肌酸磷酸激酶峰值呈正相关。结果表明,急性心肌梗死患者14天内血浆脑钠尿肽持续升高;脑钠尿肽升高水平可反映梗死面积及梗死膨展程度。     

急性心肌梗死患者血浆脑钠肽水平变化及其与左心室室壁瘤形成、左心室重构的关系研究

目的观察急性心肌梗死(AMI)患者血浆脑钠肽(BNP)水平变化,探讨其与左心室室壁瘤(LVA)形成、左心室重构的关系。方法选取2013年2月—2015年1月泗洪县人民医院收治的AMI患者78例,根据入院时左心室造影(LVG)结果分为LVA组41例和非LVA组37例。比较两组患者治疗后6 h、3 d、7 d及6个月血浆BNP水平,治疗后即刻、治疗后6个月左心室重构指标〔左心室射血分数(LVEF)、左心室收缩末期容积指数(LVESVI)、左心室舒张末期容积指数(LVEDVI)和左心室舒张末期压(LVEDP)〕。结果 LVA组患者治疗后6 h、3d、7 d及6个月血浆BNP水平高于非LVA组(P<0.05)。除治疗后即刻LVEDVI外,两组患者治疗后即刻、治疗后6个月LVEF、LVESVI、LVEDVI及LVEDP比较,差异有统计学意义(P<0.05);治疗后6个月,两组患者LVEF高于治疗后即刻,LVESVI、LVEDVI及LVEDP小于治疗后即刻(P<0.05)。Pearson相关性分析结果显示,LVA组患者血浆BNP水平与LVESVI、LVEDVI、LVEDP呈正相关(r值分别为0.621、0.592、0.763,P<0.05),而非LVA组患者血浆BNP水平与LVESVI、LVEDVI、LVEDP均无直线相关性(r值分别为0.019、0.101、0.152,P>0.05)。结论AMI并发LVA患者血浆BNP水平明显升高,血浆BNP水平可在一定程度上反映LVA形成,且与LVA病情变化、左心室重构密切相关,可作为诊断LVA形成、左心室重构的参考指标之一。     

择期PCI对急性心肌梗死患者心功能的影响

目的观察择期经皮冠状动脉介入治疗(PCI)对急性心肌梗死(AMI)患者心功能的影响。方法选择KillipⅠ~Ⅲ级AMI住院患者68例,AMI后10~14 d行冠状动脉造影证实梗死相关动脉(IRA)完全闭塞,依据是否行PCI将入选患者分为PCI组和对照组,并在住院和随访期间行C反应蛋白(CRP)、脑钠素(BNP)及超声心动图检查,测量两组术后1个月、6个月左室射血分数(LVEF)、左室舒张末期容积指数(LVEDVI)、左室收缩末期容积指数(LVESVI),测定两组AMI后7 d及6个月时CRP及BNP水平。结果 AMI后1个月,两组各项心功能参数无显著差异(P0.05),6个月时成功PCI组LVEF、LVESVI、LVEDVI明显改善(P0.05),而对照组心功能下降,两组间差异有统计学意义(P0.05),治疗6个月后,PCI组CRP、BNP降低,与AMI 7 d时及对照组同期比较,差异有统计学意义(P0.05)。结论 AMI后择期PCI,开通IRA,可明显改善心功能及临床预后。     

急性心肌梗死急性左室室壁瘤患者血浆BNP的表达及与心功能的关系

目的研究急性心肌梗死急性左室室壁瘤患者血浆脑钠肽(BNP)的表达及与心功能的关系。方法选取急性心肌梗死患者120例,根据左心室造影分为观察组(左室室壁瘤59例)和对照组(无左室室壁瘤61例),分别在入院6 h、12 h、1 d、3 d以及24 w测定患者血浆中BNP水平,并于6个月时再行左心室造影观察左室射血分数(LVEF)、左心室舒张末期容积指数(LVEDVI)、左心室收缩末期容积指数(LVESVI)、每一节段室壁运动计分(WMS)以及左室舒张末期压(LVEDP)变化,随访观察是否存在不良心脏事件。结果观察组6 h、12 h、1 d、3 d以及24 w血浆中BNP水平显著高于对照组(P0.05);对照组入院时和6个月时,LVEF、LVEDVI、LVESVI、WMS以及LVEDP均显著优于观察组(P0.05);观察组不良心脏事件发生率显著高于对照组(P0.05);观察组BNP水平与LVESVI、LVEDVI、WMS、LVEDP水平以及不良心脏事件呈正相关(P0.05),与LVEF水平呈负相关(P0.05)。结论急性心肌梗死急性左室室壁瘤患者血浆BNP水平显著升高,且与心功能存在密切关系。     

依那普利对老年不同部位心肌梗死后左室重构的长期影响

目的　探讨依那普利对老年不同部位急性心肌梗死 (AMI)左室重构的长期影响。方法　 71例老年 AMI患者于发病后 2 4 h随机分为依那普利组 (n=36)和对照组 (n=35)。定期检查超声心动图 ,随访观察 1 2个月。结果　依那普利组左室舒张末期容量指数 (LVEDVI)和左室收缩末期容量指数 (LVESVI)从 1～ 1 2个月无明显增加 ,左室质量指数 (LVMIgl/ m2 )在 6～ 1 2个月时明显减少。而对照组 (n=35)上述指标明显增加伴左室射血分数 (LVEF% )降低。对照组前壁 AMI的 LVEDVI、LVESVI比下壁 AMI和治疗组前壁 AMI均显著增加 (P<0 .0 5～ 0 .0 1 )。结论　急性AMI后的左室重构主要影响前壁 ,表现为梗死区膨展 ,左室扩张及容量负荷增加。依那普利可减少 AMI后左室容量和质量指数 ,长期应用对左室重构的发生和发展有明显的防治作用。     

急性心肌梗死后左室重构临床研究

目的　探讨溶栓治疗对急性心肌梗死后左室结构和功能的影响。方法　对 36例首发急性心肌梗死患者于梗死后 4周和 12周进行超声心动图观察。分别测定左室舒张末期容积指数 (LVEDVI)、左室收缩末期容积指数 (LVESVI)、射血分数 (EF) ,作为反映左室结构和功能变化的指标。结果　急性心肌梗死后LVEDVI、LVESVI均明显增高 (分别为P <0 0 1,P <0 0 5 )。 4周和 12周检查发现 ,溶栓组LVEDVI、LVESVI无明显差异 (分别P>0 0 5 ,P >0 0 5 ) ,EF值明显增大 (P <0 0 5 ) ;未溶栓组LVEDVI、LVESVI明显增大 (分别为P <0 0 5 ,P <0 0 5 ) ,EF值无明显变化 (P >0 0 5 ) ;对 4周和 12周的检查结果作组间比较发现 ,溶栓组LVEDVI、LVESVI均小于未溶栓组 (P <0 0 5 ) ,EF值溶栓组高于未溶栓组 (P <0 0 5 )。结论　溶栓治疗能有效地抑制急性心肌梗死后左室重构 ,改善心功能。     

缬沙坦和苯那普利对急性心肌梗死后左心室重塑的疗效

目的:了解缬沙坦和苯那普利对急性心肌梗死(AMI)后患者左心室重塑的治疗效应。方法:AMI患者35例,随机被分为3组:缬沙坦组(n=12),苯那普利组(n=12)和对照组(n=11),采用超声心动图测量入院后第1,7,14天以及3,6个月左心室舒张末容积指数(LVEDVI)左心室收缩末容积指数(LVESVI)及左心室射血分数(LVEF)的变化,并进行比较。结果:对照组与入院基础值比较,在14天及3、6个月时LVEDVI及LVESVI显著增加(P<0.05),LVEF显著减少(P<0.05)。缬沙坦组及苯那普利组,与对照组比较14天及3、6个月时LVEDVI、LVESVI降低显著(P<0.05);LVEP显著增加(P<0.05)。6个月时NYHA心功能Ⅲ级者缬沙坦组、苯那普利组各有1例,而对照组有8例。苯那普利组咳嗽发生率25％,而缬沙坦组无1例咳嗽。结论:缬沙坦及苯那普利对AMI患者具有相似的抗左心室重塑效应,缬沙坦耐受性更好。     

急性心肌梗死患者血浆脑钠肽水平变化与急性室壁瘤形成的关系

目的探讨急性心肌梗死(AMI)后,急性左心室室壁瘤(LVA)形成患者血浆脑钠肽(BNP)的动态变化及其与LVA形成和心功能状态的关系。方法首次前壁AMI患者64例,经左室造影(LVG)后分为LVA组(31例)和无LVA组(33例)。采血检测BNP,并于经皮冠状动脉介入治疗(PCI)完成后6个月时检测有创容积和压力各参数。结果LVA组AMI后6 h、第5天和第24周血浆BNP浓度均明显高于无LVA组(P<0.05)。PCI后即刻和术后6个月时,无LVA组左室射血分数(LVEF)、左室舒张末期容积指数(LVEDVI)、左室收缩末期容积指数(LVESVI)、室壁运动积分(WMS)和左室舒张末期压(LVEDP)各参数均高于无LVA组。LVA组BNP峰值水平与PCI后即刻LVESVI、LVEDVI、WMS和LVEDP呈显著正相关(P<0.01),与LVEF呈显著负相关(P<0.01)。LVA组MACE发生率明显高于无LVA组患者(P<0.05),且BNP峰值水平与主要不良心脏事件发生率显著正相关(P<0.05)。结论AMI后BNP的过度分泌参与了AMI后左室重构和LVA的形成,并影响着其后的心室功能。     

急性心肌梗死患者血浆脑钠肽与左室室壁瘤形成和心功能的关系

目的 探讨急性心肌梗死（AMI）急性左室室壁瘤形成患者血浆脑钠肽（BNP）的动态变化特点及其与左室室壁瘤形成和心功能状态的关系。方法 首次前壁AMI患者64例，经左心室造影后分为左室室壁瘤组31例和无左室室壁瘤组33例。分别于发病后6h、12h、18h和1d、2d、3d、5d及24周采血检测BNP，并于经皮冠状动脉介入治疗（PCI）完成后6个月时再行左心室造影，检测有创容积和压力各参数。随访6个月内的主要恶性心脏事件发生率。结果 左室室壁瘤组发病后6h、第5d和第24周血浆BNP浓度均明显高于无左室室壁瘤组（均为P〈0．05）。在相同血流动力学情况下，无论左室舒张末期压（LVEDP）是否升高（≥18mmHg），左室室壁瘤组患者BNP的峰值浓度均明显高于无左室室壁瘤患者。PCI后即刻和术后6个月时，无左室室壁瘤组左室射血分数（LVEF）、左心室舒张末期容积指数（LVEDVI）、左心室收缩末期容积指数（LVEsVI）、每一节段室壁运动记分（WMS）和LVEDP各参数均高于无左室室壁瘤组。左室室壁瘤组BNP峰值水平与PCI后即刻LVESVI、LVEDVI、WMS和LVEDP呈显著正相关（r=0．56、0．60、0．52、0．77，均为P〈0．01），与LVEF呈显著负相关（r=-0．72 P〈0．01）。左室室壁瘤组恶性心脏事件发生率明高于无左室室壁瘤组患者（均为P〈0．05），且BNP峰值水平与恶性心脏事件发生率亦有显著相关（r=0．58，P〈0．05）。结论血浆BNP水平在AMI后左室室壁瘤形成患者中明显高于无左室室壁瘤者，且与左室重构程度和血流动力学变化密切相关，提示AMI后BNP的过度分泌参与了AMI后左室重构和左室室壁瘤的形成，并影响着其后的心室功能。     

骨髓干细胞动员对急性心肌梗死后左室重构影响的临床研究

目的 :观察骨髓干细胞动员对急性心肌梗死 (AMI)患者左室重构的影响。方法 :4 8例AMI患者随机分为动员组 (2 5例 )和对照组 (2 3例 ) ,动员组连续 3d给予粒细胞集落刺激因子 (G CSF) 30 0 μg/d ,用2 0 1Tl静息—再分布心肌显像比较两组第 6d、 30d的梗死面积 ,超声心动图观察 72h内和 3个月的左室舒张末期容积指数 (LVEDVI)、收缩末期容积指数 (LVESVI)、室壁运动指数 (WMSI)、射血分数(LVEF)。结果 :动员组治疗后心肌梗死面积明显减少 (0 383± 0 0 77vs 0 5 6 1± 0 0 96 ,P <0 0 1) ,LVESVI减少 [(2 7 4 7± 7 86 )ml/m2 vs (34 5 0± 8 0 8)ml/m2 ,P <0 0 5 ],WMSI减少 (1 10± 0 11vs 2 2 6±0 14 ,P <0 0 1) ,LVEF增加 (0 5 9± 0 0 7vs 0 4 8± 0 0 7,P <0 0 1)。结论 :应用G CSF动员AMI患者自身骨髓干细胞可明显缩小心肌梗死面积及有效防治左室重构     

急性心肌梗塞患者血浆脑钠素评价左心室重构的临床研究

目的 :探讨心肌梗塞后血浆脑钠素 (BNP)浓度与左心室重构间的关系。　　方法 :用左心室造影投影系统计算出心肌梗塞急性期及恢复期左心室容积指标。用放射免疫法测定急性期及恢复期血浆 BNP浓度 ,并根据左心室容积指标分组 ,左心室容积增加率 >2 0 %为左心室重构组 ,否则为非重构组。　　结果 :重构组恢复期左心室舒张末期及收缩末期容积均显著高于非重构组 (P<0 .0 0 1) ,亦显著高于本组急性期左心室容积 (P<0 .0 0 1)。重构组急性期血浆 BNP浓度明显高于非重构组 (入院即刻、入院后 2 4、48、72小时的组间比较分别为 P<0 .0 1,P<0 .0 1,P<0 .0 0 1,P<0 .0 0 1) ;恢复期血浆 BNP浓度重构组较非重构组的增加更为明显 (P<0 .0 0 0 1)。重构组的血浆 BNP浓度与恢复期左心室容积及左心室容积变化量之间存在密切相关。　　结论 :血浆 BNP浓度在急性心肌梗塞后发生左心室重构的患者中显著升高 ,并与左心室重构的程度之间存在密切的相关性。它对心肌梗塞预后的预测价值值得探讨。     

Circulating level of gelatinase activity predicts ventricular remodeling in patients with acute myocardial infarction

BACKGROUND: Matrix metalloproteinase (MMP) plays an important role in the development of ventricular remodeling in an animal model of acute myocardial infarction (AMI). We examined whether circulating MMP activity can predict left ventricular (LV) remodeling after AMI in humans. METHODS: We measured the circulating level of MMP-2 and MMP-9 activities (gelatinase activity) at 14 days after the onset of AMI by gelatin zymography in 52 consecutive patients (age 62+/-2). All patients underwent direct PTCA and stenting at an acute stage, and were treated subsequently with losartan or enalapril. Biplane left ventriculography was performed at admission, and 2 weeks and 6 months after the onset of AMI. RESULTS: We expressed gelatinolysis activity as the ratio to MMP-2 standard. Mean gelatinase activity was 0.721+/-0.013. We divided patients into two groups, groups with gelatinolysis activity <0.72 (low group, n=27) and >0.72 (high group, n=25). Either change in LV end-diastolic volume index (LVEDVI, ml/m(2)) or end-systolic volume index (LVESVI, ml/m(2)) from admission to 2 weeks was not different between the two groups. Changes in both LVEDVI and LVESVI from 2 weeks to 6 months were greater in high gelatinolysis activity group than those in low activity group. Moreover, circulating level of gelatinolysis activity was positively correlated with changes in LVEDVI and LVESVI from 2 weeks to 6 months. CONCLUSION: These results demonstrate that circulating level of gelatinase activity can predict LV remodeling after AMI. Inhibition of gelatinase activity at the acute phase may be a therapeutic strategy for the prevention of remodeling after AMI.     

急性心肌梗死患者急诊PCI术后血浆B型钠尿肽水平变化及意义

目的 观察急性心肌梗死（AMI）患者血浆B型钠尿肽（BNP）水平变化,并分析其与左心室重构（LVRM）及预后的关系.方法 选择首次AMI住院患者112例,均行急诊经皮冠状动脉介入术（PCI）,梗死相关动脉（IRA）开通69例（开通组）、未开通43例（未开通组）.入院时检测心肌损伤指标[CK、CK-MB、肌钙蛋白I（cTnI）],入院第7天超声检查左心室射血分数（LVEF）、左心室舒张末期容积指数（LVEDVI）,测定入院时、AMI后24 h、入院第7天血浆BNP（记为BNP1、BNP2、BNP3）;术后随访2 a,记录心血管不良事件（MACE）发生情况.结果 两组入院时血清CK、CK-MB、cTnI、TG、LDL-C比较,P均＞0.05;入院后第7天,开通组较未开通组LVEF升高（P＜0.05）;两组BNP1差异无统计学意义,BNP2明显高于BNP1、BNP3（P均＜0.05）,未开通组BNP2、BNP3较开通组明显升高（P均＜0.01）.AMI患者3个时点血浆BNP与LVEDVI、CK、CK-MB、cTnI均呈正相关（P均＜0.01）,与LVEF呈负相关（P均＜0.01）.开通组2 a内发生MACE 10例,未开通组16例,P＜0.01;BNP2预测AMI急诊PCI患者2 a内MACE的ROC曲线下面积为0.791,P＜0.05;其分界值为332 ng/L时,预测MACE的敏感性为76.9％、特异性为73.3％.结论 AMI急诊PCI术后血浆BNP水平升高,其水平变化有助于判断IRA开通情况;AMI后24 h血浆BNP水平可预测患者MACE,有助于更早了解LVRM情况,以阻止或减缓AMI后心力衰竭的发生、发展.     

Marked Elevation of Brain Natriuretic Peptide Levels in Pericardial Fluid Is Closely Associated With Left Ventricular Dysfunction

Objectives. The purpose of this study was to investigate whether atrial and brain natriuretic peptides (ANP and BNP, respectively) represent autocrine/paracrine factors and are accumulated in pericardial fluid.Background. ANP and BNP, systemic hormones produced by the heart, have elevated circulating levels in patients with heart failure. Recent evidence suggests that the heart itself is one of the target organs for these peptides.Methods. With an immunoreactive radiometric assay, we measured the concentrations of these peptides in plasma and pericardial fluid simultaneously in 28 patients during coronary artery bypass graft surgery.Results. The pericardial levels of BNP were markedly elevated in patients with impaired left ventricular function. We investigated the correlation of ANP and BNP levels in plasma or pericardial fluid with left ventricular hemodynamic variables. None of the hemodynamic variables correlated with ANP levels in plasma or pericardial fluid. Both plasma and pericardial fluid levels of BNP were significantly related to left ventricular end-diastolic and systolic volume indexes (LVEDVI and LVESVI, respectively). In addition, BNP pericardial fluid levels had closer relations with LVEDVI (r = 0.679, p < 0.0001) and LVESVI (r = 0.686, p < 0.0001) than did BNP plasma levels (LVEDVI: r = 0.567, p = 0.0017; LVESVI: r = 0.607, p = 0.0010). BNP levels in pericardial fluid but not in plasma correlated with left ventricular end-diastolic pressure (r = 0.495, p = 0.0074).Conclusions. BNP levels in pericardial fluid served as more sensitive and accurate indicators of left ventricular dysfunction than did BNP levels in plasma. Thus, BNP may be secreted from the heart into the pericardial space in response to left ventricular dysfunction, and it may have a pathophysiologic role in heart failure as an autocrine/paracrine factor.     

Effects of reperfusion on left ventricular ejection fraction and volume after acute myocardial infarction.

The effects of reperfusion on left ventricular (LV) function and volume were studied in patients with evolving acute myocardial infarction (AMI). We analyzed the LV ejection fraction and volume in patients who had been admitted within 24 h of the onset of their first AMI with culprit lesion of #6, #7 and #1 (American Heart Association classification). Sixty-five patients (Re group) received successful reperfusion therapy within 6 h after the AMI. The other 60 patients (Oc group), who were admitted from 6 to 24 h after the AMI, received conservative therapy. Patients with re-obstruction of the culprit lesion after reperfusion therapy were excluded from the Re group. Patients with spontaneous recanalization following conservative therapy were excluded from the Oc group. The LV ejection fraction (LVEF), LV end-systolic volume index (LVESVI), and LV end-diastolic volume index (LVEDVI) were measured using a modified Dodge's formula by left ventriculography performed 4 weeks after the AMI. LVEF in the Re group was significantly greater than in the Oc group (57 +/- 12 vs 49 +/- 11%) (mean +/- SD, p less than 0.01). LVESVI in the Re group was significantly smaller than in the Oc group (30 +/- 13 vs 38 +/- 16 ml/m2, p less than 0.01). Although LVEDVI was not significantly different between the 2 groups, in patients with a responsible coronary lesion of segment #6, LVEDVI in the Re group was significantly smaller than in the Oc group (67 +/- 14 vs 77 +/- 18 ml/m2, p less than 0.05). Although LVEF and LV volume correlated in both groups, the correlation was weak (r = 0.40-0.42), suggesting that LV volume was not dependent solely on LV functional recovery. The incidence of ventricular aneurysm in the Re group was significantly lower than in the Oc group (15.4 vs 45.0%, p less than 0.01). Multivariate analysis selected reperfusion of the responsible coronary artery as one of the factors significantly associated with a reduction of LVEDVI, LVESVI, an improvement of LVEF, and a decrease in the rate of aneurysm formation. In summary, our results indicated that reperfusion improved EF, reduced LV volume, and decreased the rate of aneurysm formation as compared to non-reperfusion, which suggests that reperfusion therapy is beneficial for both functional recovery and ventricular remodeling.     

冠心病患者外周血单核细胞镁浓度对心室重塑的影响

目的 观察冠心病患者外周血单核细胞镁浓度、血清基质金属蛋白酶-9水平变化及其与心室重塑、心功能的关系。方法 选择78例冠心病患者，根据左室射血分数（LVEF）分为3组，1组LVEF〉0．50、2组LVEF〉0．35、3组LVEF〈0．35。测定患者外周血单核细胞内镁（Mg）及血清白细胞介素-6（IL-6）、基质金属蛋白酶-9（MMP-9）水平，超声测定左室收缩末期容量指数（LVESVI）、舒张末期容量指数（LVEDVI）。结果 随着LVEF降低，患者血单核细胞Mg降低、血清IL-6及MMP-9显著增高（P〈0．05）；LVEDVI、LVESVI与Mg均呈负相关（相关系数分别是r=-0．49，r=-0．43；P〈0．01），LVEDVI与IL-6、MMP-9呈正相关（相关系数分别是r=0．41，r=0．47；P〈0．01）；Mg与IL-6及MMP-9均呈负相关（相关系数分别是r=-0．47，r=-0．58；P〈0．01）。结论 冠心病患者的心肌重塑及收缩功能障碍，可能与细胞内缺镁有关。     

扩张型心肌病患者心外膜脂肪厚度与左心室重构的相关性

目的研究扩张型心肌病(DCM)患者心外膜脂肪厚度与左心室重构及左心室功能不全的关系。方法收集DCM患者120例(DCM组)和健康体检者76例(对照组),应用常规心脏超声测量左心室收缩末内径(LVESD)、左心室舒张末内径(LVEDD)、左心室收缩末容积(LVESV)、左心室舒张末容积(LVEDV)、左心室收缩末容积指数(LVESVI)、左心室舒张末容积指数(LVEDVI)、左心室收缩末球形指数(SIs)、左心室舒张末球形指数(SId)、LVEF、心外膜脂肪厚度等,比较2组各超声指标的关系。结果 DCM组LVESD[(53.0±9.6)mmvs(33.2±4.5)mm]、LVEDD[(68.5±9.3)mmvs(38.3±3.0)mm]、LVESV[(79.5±13.6)ml vs(42.0±10.5)ml]、LVEDV[(165.0±18.6)ml vs(98.2±14.0)ml]、LVESVI[(49.2±10.7)ml/m2 vs(30.6±9.6)ml/m2]、LVEDVI[(101.8±10.0)ml/m2 vs(61.4±9.0)ml/m2]较对照组明显增高,LVEF[(31.5±7.2)%vs(64.9±6.4)%]、SIs[(1.3±0.2)vs(2.0±0.3)]、SId[(1.3±0.2)vs(1.8±0.2)]和心外膜脂肪厚度[(4.9±1.1)mmvs(7.8±2.0)mm]较对照组明显降低(P<0.05)。DCM组心外膜脂肪厚度与LVESD、LVEDD、LVESV、LVEDV、LVEDVI、LVESVI、SIs、SId呈正相关(P<0.05)。结论 DCM患者的心外膜脂肪厚度与左心室重构明显相关,与左心室功能不全无相关性。     

Viable Myocardium Impact on Left Ventricular Function after Late Revascularization of Infarct-related Artery in Acute Myocardial Infarction

Objectives The long-term benefit of late reperfusion of infarct-related artery (IRA) after acute myocardial infarction (AMI) is controversial, and the benefit mechanisms remain uncertain. Low dose dobutamine stress echocardiography (LDSE) can identify viable myocardium and predict improvement of wall motion after revascularization. Methods Sixty-nine patients with first AMI who did not received early reperfusion therapy were studied by LDSE at 5 to 10 days after AMI. Wall motion abnormality and left ventricular size were measured at the same time. Successful PCI were done in all patients at 10 to 21 days after AMI onset. Patients were divided in two groups based on the presence or absence of viable myocardium. Echocardiography was repeated six months later. Results There were 157 motion abnormality segments. 89 segments (57%) were viable during LDSE. 26 patients (38%) with viability and 43 (62%) without. In viable group, left ventricular ejection fraction (LVEF) was increased (P < 0.05), and left ventricular end systolic volume index (LVESVI) and wall motion score (WMS) were decreased (P < 0.05 and P < 0.01) significantly at 6 months compared with baseline. But in patients without viability, LVEF was decreased (P < 0.01), and LVESVI and left ventricular end diastolic volume index (LVEDVI) were increased (P<0.05) significantly after 6 months, and the WMS did not changed (P > 0.05). LVEF increased (P< 0.05) and WMS decreased (P < 0.05) on LDSE during acute phase in patients with viability, but they were not changed in the nonviable group. Conclusions Late revascularization of IRA in patients with presence of viable myocardium after AMI is associated with long-term preservation left ventricular function and less ventricular remodeling. Improvement of left ventricular systolic function on LDSE indicates late phase recovery of left ventricular function after late revascularization.     

左室造影对急性心肌梗死后左室重构发生的评价

目的 :探讨左室造影对急性心肌梗死 (AMI)后左室重构发生的评价及其临床意义。方法 :用左室造影投影系统计算出心肌梗死 (MI)急性期及恢复期左室容积指标 ,根据左室容积指标将患者分为重构组和非重构组 (均为 2 0例 ) ;用漂浮导管测定血流动力学指标 ;用99m 锝心血池扫描测定左室射血分数 (LVEF) ;用2 0 1铊心肌血流扫描测定梗死的面积积分 (ES)和重症度积分(SS)。结果 :重构组恢复期左室舒张末期及收缩末期容积均显著高于非重构组 (P <0 .0 1) ,亦显著高于该组急性期左室容积 (P <0 .0 1)。重构组急性期肌酸磷酸激酶峰值、急性期及恢复期肺小动脉嵌压、恢复期左室舒张末压力以及恢复期ES和SS均显著高于非重构组 ,而LVEF显著低于非重构组。重构组恢复期左室收缩末期容积及舒张末期容积与LVEF之间存在有意义的相关关系 (r =- 0 .72 ,P <0 .0 1;r =- 0 .6 7,P <0 .0 1)。结论 :AMI后进行左室造影能较准确地评价左室重构的发生及严重程度。发生左室重构的患者其心肌坏死量较大 ,且其恢复期左室功能显著降低。恢复期左室功能与左室容积指标之间存在密切相关。