急性心肌梗塞前有无心绞痛对塞后心肌损害的影响

目的 探讨心绞痛对急性心肌梗塞（ＡＭＩ）后心肌损害的影响。方法 将８２例急性心肌梗塞患者分成心绞痛组（４８例）和无心绞蛋白（ＣＲＰ）的尿微白蛋白分沁和率（ＣＰＫ）及其同功酶（ＣＫ－ＭＢ）血清肌钙蛋白（ＣＴnＴ）、Ｃ反应蛋白（ＣＲＰ）和尿微蛋白分泌率（ＡＥＲ）变化。结果 心肌梗塞前有心绞痛者的ＣＰＫ、ＣＫ－ＭＢ、ＣＴnＴ 、ＣＲＰ和ＡＥＲ增高水平均较低,与心肌梗塞前无心绞痛患者比较,均有显著性差异（Ｐ     

急性心肌梗塞前有无心绞痛对梗塞后心肌损害的影响

目的　探讨心绞痛对急性心肌梗塞（ＡＭＩ）后心肌损害的影响。方法　将８２例急性心肌梗塞患者分成心绞痛组（４８例）和无心绞痛组（３４例）,测定心脏肌酸磷酸激酶（ＣＰＫ）及其同功酶（ＣＫ－ＭＢ）、血清肌钙蛋白（ＣＴｎＴ）、Ｃ反应蛋白（ＣＲＰ）和尿微白蛋白分泌率（ＡＥＲ）变化。结果　心肌梗塞前有心绞痛者的ＣＰＫ、ＣＫ－ＭＢ、ＣＴｎＴ、ＣＲＰ和ＡＥＲ增高水平均较低,与心肌梗塞前无心绞痛患者比较,均有显著性差异（Ｐ＜ ０．０５）。结论　心绞痛对ＡＭＩ的心肌损害有明显保护作用。     

梗死前心绞痛对心肌梗死患者近期预后的影响研究

目的 探讨梗死前心绞痛(PA)对心肌梗死患者近期预后的影响.方法 选择在我科溶栓治疗的ST段抬高性心肌梗死(STEMI)78例,根据心肌梗死发生前72h内有无PA病史,分为PA组(A组,40例)和非PA组(B组,38例),观察两组患者溶栓治疗后的再通率、血清心肌酶(CK-MB及CTnT)峰值、心脏并发症(严重心律失常、KillipⅡ级以上心力衰竭)及住院病死率.结果 A组的溶栓再通率明显高于B组(P＜0.05);A组的血清心肌酶峰值、心脏并发症及住院病死率均低于B组(P＜0.05).结论 心肌梗死发生前72h内出现的PA,由于心肌缺血预适应(IP)机制的作用,可增强心肌对缺血的耐受性,减轻心肌缺血/再灌注性损伤,从而对心肌梗死患者的近期预后产生有益的影响.     

梗死前心绞痛对初发心肌梗死QT离散度影响的研究

目的　通过梗死前心绞痛对急性心肌梗死 (AMI)者QT离散度 (QTd)的影响 ,阐明其能否诱导缺血预适应(IP)以及与QTd的关系。方法　对 1 1 8例AMI患者 ,分为有梗死前心绞痛组 (A组 )和无梗死前心绞痛组 (B组 ) ,并根据心绞痛次数不同将A组分为A1 、A2 、A3 3个亚组。对各组的QTd以及恶性室性心律失常 (MVAR)、猝死情况进行比较。结果　QTdA组为 (5 1 6 8± 1 2 32 )ms,B组为 (6 3 1 4± 1 1 75 )ms,两组比较有显著性差异 (P <0 0 1 ) ;两组MVAR分别为4例 (5 97%)和 1 1例 (2 1 5 7%) ,经比较差异有显著性 (P <0 0 5 ) ;猝死分别为 1例 (1 4 9%)和 6例 (1 1 76 %) ,经比较差异无显著性 (P =0 0 5 2 %) ;A组的 3个亚组QTd分别为A1 组 (5 9 6 0± 1 1 72 )ms、A2 组 (5 2 1 9± 1 3 4 8)ms、A3 组 (46 81± 1 2 2 7)ms,A2 与A1 比较有下降趋势 ,但无统计学意义 (P <0 0 5 ) ,A3 与A1 比较有统计学意义 (P <0 0 5 )。结论　梗死前心绞痛具有IP作用 ,能明显降低初发AMI的QTd,减轻心电不稳定性 ,从而减少致命性MVAR的发生。     

梗死前心绞痛对急性心肌梗死转归的影响

27%-91%的急性心肌梗死患者有梗死前心绞痛病史[1].梗死前心肌缺血的发生可限制心肌梗死时心肌损伤坏死的面积[2].本文将156例急性心肌梗死住院患者分为有梗死前心绞痛和无梗死前心绞痛进行对比分析如下. 1.资料与方法: 1.1一般资料:选择我院2001年-2009年符合急性心肌梗死临床诊断标准并除外再梗死的156例住院患者,其中男131例,女25例,年龄28岁-79岁,平均62岁.有梗死前心绞痛(A组)77例,入院前有典型心绞痛反复发作史或心电图检查有缺血型ST和T波改变;无梗死前心绞痛(B组)79例,入院前无心绞痛史及心电图呈缺血型改变史.     

梗塞前心绞痛在急性心肌梗塞中的临床意义

为探讨梗塞前心绞痛对急性心肌梗塞的影响，本文对79例急性心肌梗塞病例按有无梗塞前心绞痛分为二组。两组间性别、年龄及冠状动脉病变程度无显著性差异（P＞0．05）。有梗塞前心绞痛组心肌酶峰值浓度低，左室射血分数及局部室壁运动较好，组间有显著性差异（P＜0．01），有梗塞前心绞痛组室壁瘤及急性左心功能不全发生率显著低于无梗塞前心绞痛组（P＜0．05），且有梗塞前心绞痛组内存在侧支循环者心肌酶峰值明显减低（P＜0．05）。结果显示有梗塞前心绞痛者心肌坏死、损伤程度较轻，左心功能保存较好，并发症发生率较低，提示有心肌缺血预适应的参与，侧支循环有增强心肌保护作用的征象。     

急性心肌梗死前心绞痛对心功能的影响

国内外临床研究发现,梗死前心绞痛(preinfarction angina pectoris)对急性心肌梗死(acute myocardial infarction,AMI)发作时严重的心肌缺血具有保护作用,不但影响心肌梗死面积和心功能,而且与患者的预后有关[1,2].但是,具体机制尚不明了.本文回顾性分析近年我院收治的158例AMI患者,根据其发病前48h内有无心绞痛发作分成二组,观察分析梗死前心绞痛对AMI患者心功能的影响,探讨可能的发生机制.     

心肌梗死前心绞痛对老年急性前壁心肌梗死的保护作用研究

目的　观察心肌梗死前 2 4h内心绞痛对老年急性前壁心肌梗死有无保护作用。方法　选择老年急性前壁心肌梗死 10 8例 ,有梗死前心绞痛者为A组 (5 3例 )、无梗死前心绞痛者为B组 (5 5例 ) ,行心电图、心肌酶、超声心动图、核素心血池等检查。对心电图QRS积分值、心肌酶峰值、左室射血分数、心源性休克、室壁瘤形成及短期病死率进行比较。结果　B组心肌梗死患者QRS积分值、心肌酶峰值、心源性休克、室壁瘤形成及 1个月病死率明显高于A组 (P<0 .0 5 ) ,左室射血分数明显低于A组 (P<0 .0 5 )。结论　梗死前 2 4h内心绞痛可减低老年急性心肌梗死时QRS积分值 ,保护心功能 ,降低短期病死率。缺血预处理可能是梗死前心绞痛保护作用的主要机制。     

梗死前心绞痛史对心肌梗死面积及左室功能的影响

目的 评价梗死前心绞痛对梗死面积及左室射血分数的影响,初步探讨缺血预适应的临床价值。方法 具有确诊的Ｑ波心肌梗死患者１４４人,记录其年龄、主要病史及服药史。采用ＱＲＳ记分（ＱＲＳｓ）法测量梗死面积（ＭＩＳ）,以超声多谱勒测定左室射血分数（ＬＶＥＦ）。将患者按梗死前１月内及４８小时内是否曾发作心绞痛分组,对上述指标进行比较。结果 两组患者年龄及高血压史无差别,但梗死前心绞痛组合并糖尿病者较少（Ｐ〈）     

急性心肌梗死前心绞痛对预后的影响

目的观察急性心肌梗死（AMI）前心绞痛（AP）对AMI者临床症状及近期预后的影响。方法对266例AMI者以AMI前有无AP分为两组,且比较两组对肌酸激酶（CK）峰值浓度、肌酸激酶同工酶（CK-MB）峰值浓度、冠脉侧支循环和左室功能的影响。结果有AP组（A组）的188例与无AP组（B组）的78例的严重心律失常、心源性休克、病死率等A组明显低于B组（P〈0.01）,侧支循环发生率、梗死范围、左室功能A组明显优于B组。结论既往及AMI前心绞痛可使心肌循环作出适应性调节,促进冠脉侧支循环的建立,梗死前反复的AP所致的缺血刺激,具有缺血预适应的保护作用,从而减少梗死面积和心肌的损害程度。     

梗死前心绞痛对糖尿病急性心肌梗死患者心功能的影响

目的 探讨梗死前心绞痛对糖尿病急性心肌梗死(AMI)患者心功能的影响. 方法 216例糖尿病AMI患者,按梗死前48 h内有无心绞痛分为无心绞痛史组78例和有心绞痛史组138例.所有患者均在发病6 h内行溶栓或直接经皮冠状动脉介入(PCI)治疗.术后2 w行99mTc心血池显像测定心功能.结果 有心绞痛史组左室射血分数(LVEF)、左室峰射血率(LPER)和左室峰射血时间(LTPER)均好于无心绞痛史组(P＜0.05).有心绞痛史组左室峰充盈率(LPFR)和左室峰充盈时间(LTPFR)均好于无心绞痛史组(P＜0.05).结论 梗死前心绞痛可以改善糖尿病AMI患者的心功能.     

梗塞前心绞痛对急性心肌梗塞患者的有益作用

43例首次穿壁性急性心肌梗塞(AMI)患者于静脉内溶栓后90min行冠状动脉造影.其中24例AMI前6h内有心绞痛(甲组),另19例梗塞前无心绞痛(乙组).尽管两组多支冠状动脉病变及侧支循环发生率相似.但甲组异常Q波导联数、QRS积分、CPK峰值及CPK峰值距发病时间显著低于乙组.而梗塞相关冠状动脉再通率显著高于乙组.22例IRA开通患者中,有心绞痛者其基础左心室功能较无心绞痛者好.出院前超声心动图检查显示,甲组左心室局部和整体收缩功能、舒张充盈明显改善,而乙组收缩功能降低、舒张充盈无明显变化.住院期心脏事件发生率甲组显著低于乙组.本文提示,梗塞前心绞痛可能由于早期心肌再灌注和缺血预适应对梗塞大小、左心室功能及预后具有益作用.     

直接经皮冠状动脉介入治疗对有无梗死前心绞痛患者心肌存活性和心室收缩同步性的影响

目的　探讨直接经皮冠状动脉介入治疗 (PCI)对有无梗死前心绞痛的急性心肌梗死 (AMI)患者心肌存活性和心室收缩同步性的近期影响。方法　 87例首次 AMI患者 ,按梗死前有无心绞痛分为 3组 :A组 :无心绞痛史 30例。 B组 :梗死前 4 8h内有心绞痛史 39例。 C组 :仅在梗死前 >4 8h有心绞痛史 18例。所有患者均在发病 6 h内行直接 PCI术。术后 1周、4周行 99m　 Tc- MIBI心肌灌注断层显像 (SPECT)测定心肌存活性 ;术后 2周行 99m　 Tc心血池显像测定心室收缩同步性参数。结果　 (1) B组肌酸激酶同工酶 (CK- MB)峰值显著低于 A组 (P<0 .0 1)。 (2 ) B组放射性缺损面积 (MIA)小于 A组 (P<0 .0 5 ) ;AMI后 4周与 1周比较 ,B组 MIA显著缩小 (P<0 .0 1) ,病变区放射性计数显著增加 (P<0 .0 1) ;C组和 A组前后比较均无显著差异。 (3)心功能 :B组左心室射血分数 (L VEF)高于 A组 (P<0 .0 1) ;左心室收缩同步性 :B组左心室相角程 (L PS)低于 A组 (P<0 .0 5 ) ;以上各参数 ,C组和 A组比较均无显著差异。结论　 (1)首次急性心肌梗死前 4 8h内心绞痛发作可导致心肌缺血预适应 (ischemic preconditioning,IP)的产生 ,并可缩小心肌梗死面积 ,保护心功能。 (2 )直接 PCI可显著提高有 IP的急性心肌梗死患者的近期心肌存活性和     

The effect of preinfarction angina on clinical reperfusion time in patients with acute myocardial infarction receiving successful thrombolytic therapy

BACKGROUND: Preinfarction angina (PA) and early reperfusion of infarct-related arteries have been shown to reduce infarct size in patients with acute myocardial infarction (AMI). The beneficial effects of PA on infarct size have been attributed to the development of ischemic preconditioning and faster coronary recanalization in patients treated with thrombolytic therapy (TT). OBJECTIVE: To evaluate the effect of PA on clinical coronary reperfusion time in patients with AMI receiving successful TT. METHODS: Seventy-five patients presenting with AMI (within 6 h after the initial onset of symptoms) were studied. All patients received TT and were evaluated with coronary angiography (CA) at predischarge. The patients were divided into two groups: group 1 (PA-positive) comprised those who experienced a new onset of prodromal angina within 72 h before the onset of AMI. Group 2 (PA-negative) comprised those who had a sudden onset of AMI without the preceding angina. The successful myocardial reperfusion criteria after TT were ST segment resolution of 50% or greater, the appearance of reperfusion arrhythmias and the resolution of chest pain. The time of reperfusion criteria was recorded after TT. CA was performed in all patients at predischarge. Patients with no patent infarct-related arteries on CA and clinical failure of reperfusion were excluded from the study. RESULTS: Clinical characteristics, risk factors and angiographic findings did not differ significantly between the groups. The time interval from the start of continuous chest pain to TT was also similar between the groups. The left ventricular ejection fraction was higher and there were less frequent ventricular arrhythmias in patients with PA than in those without PA (47.9+/-7.4 versus 44.4+/-8.1, P=0.041, and 17.1% versus 37.5%, P=0.043, respectively). The clinical reperfusion time was significantly shorter in the patients with PA than in those without PA (68.2+/-24.5 min versus 81.4+/-19.3, P=0.012). The clinical reperfusion time was positively correlated with age and the time interval from the start of continuous chest pain to TT but inversely related to the presence of PA. CONCLUSIONS: In patients with AMI preceded by PA, TT resulted in more rapid clinical reperfusion than in patients without PA. Thus, earlier myocardial reperfusion may account for smaller infarct size and better prognosis in patients with PA.     

梗死前心绞痛对初发ST段抬高的急性心肌梗死的影响

目的：观察梗死前心绞痛（PAP）对初发 ST段抬高急性心肌梗死（AMI）进展的影响。方法：280例初发ST段抬高 AMI患者,发病后24h内进行冠脉造影,心电图检查并作 QRS记分。根据有无PAP,患者被分为 PAP （102例）和非PAP组（178例）。根据发病至造影时间患者被分为：早期组（＜2h,60例）、中期组（2-6h,150例）和晚期组（6-24h,70例）。结果：伴有PAP患者较无PAP患者 QRS记分显著降低[（2.4±2.4）分比（3.2±3.0）分],PAP组高 QRS记分比例亦显著低于非 PAP组（8.0％比18.4％）,P 均＜0.05。早期组,PAP与非PAP患者之间 QRS记分无显著差异[（2.0±1.8）分比（2.6±2.8）分,P＝0.35];中期组,PAP患者QRS记分显著低于非PAP组[（2.0±2.1）分比（3.0±3.0）分,P＝0.03];晚期组,PAP和非 PAP患者 QRS记分较中期组显著上升,但两组间比较无显著差异[（4.1±3.3）分比（5.5±2.9）分,P＝0.13];非PAP组患者 QRS记分随着发病时间延长逐渐增加。结论：梗死前心绞痛可延迟急性心肌梗死疾病进展,扩大再灌注治疗时间窗。     

Effect of preinfarction angina pectoris on microcirculation in patients with reperfused acute myocardial infarction

Preinfarction angina pectoris has been suggested in some studies to have a beneficial effect on left ventricular function after acute myocardial infarction (AMI). The precise mechanisms of this protection have not been fully elucidated. The effect of preinfarction angina on myocardial tissue perfusion also needs to be clarified. In this study, we investigated the influence of preinfarction angina on microvasculatory damage by using ST-segment resolution and pressure-derived collateral flow index (CFIp) as a marker of microcirculatory perfusion. METHODS: We studied 41 patients with a first AMI in whom thrombolysis in myocardial infarction (TIMI) grade 3 flow in the infarct-related artery was established by thrombolytic therapy. The percent resolution of ST-segment deviation (deltasigma ST) after thrombolysis was determined. All of the patients had TIMI grade 3 flow in IRA at the coronary angiography, which was done a mean of 4 days after AMI. Intracoronary pressure measurements and stent implantation to the IRA were performed. After angiography, CFIp was calculated as the ratio of simultaneously measured coronary wedge pressure-central venous pressure (Pv) to mean aortic pressure-Pv. RESULTS: Patients with preinfarction angina pectoris had greater percent deltasigma ST than those without PA (67 +/- 18% vs. 44 +/- 24%, p = 0.03).The mean of the coronary wedge pressure (16.4 +/- 7.4 compared with 23.2 +/- 9.4, P < 0.03) and the pressure-derived collateral flow index (0.15 +/- 0.10 compared with 0.22 +/- 0.08, P < 0.03) were significantly lower in patients with preinfarction angina compared to those without. CONCLUSION: Preinfarction angina is associated with a greater degree of ST-segment resolution and lower CFI-p in patients with TIMI-3 reflow after thrombolysis. These findings suggest that a protective effect of preinfarction angina against reperfusion injury may result in greater ST resolution and lower CFIp after AMI.     

梗死前心绞痛对急性心肌梗死患者直接PCI术后的影响

目的　探讨梗死前心绞痛对首次急性心肌梗死 (AMI)患者直接经皮冠状动脉介入治疗 (PCI)术后的近期影响。方法　 10 0例首次 AMI患者 ,按梗死前有无心绞痛史分为 A(有心绞痛史 ,5 5例 )、B(无心绞痛史 ,4 5例 ) 2组 ,所有患者均在发病 12 h内行直接 PCI术。术前术后监测心肌酶变化 ;术后 2周行心血池显像测定左心室射血分数。并观察住院期间心律失常、心力衰竭或心源性休克的发生率及再梗死率、病死率。结果　 (1) A组肌酸激酶同工酶峰值低于 B组 (P<0 .0 5 )。 (2 ) A组自溶现象发生率高于 B组 (P<0 .0 5 ) ;A组无再流现象发生率低于 B组 (P<0 .0 5 )。 (3) A组左心室射血分数高于 B组 (P<0 .0 5 )。 (4 ) A组心力衰竭或心源性休克的发生率和再梗死率均低于B组 (P<0 .0 5 )。结论　梗死前心绞痛可促进 AMI患者梗死相关动脉自溶现象的产生 ,并可减少直接 PCI术后无再流现象的发生 ,从而改善心室功能和近期预后     

梗死前心绞痛对急性心肌梗死患者直接经皮冠状动脉介入治疗术后的影响

目的　探讨梗死前心绞痛对首次急性心肌梗死(AMI)患者直接经皮冠状动脉介入治疗(PCI)术后的近期影响。方法　将120例首次AMI患者分成有梗死前心绞痛史组(A组, 68例)和无梗死前心绞痛史组(B组, 52例),在发病12小时内行直接PCI术,分析梗死前心绞痛对肌酸肌酶(CK)峰值浓度、左心室功能和临床转归的影响。结果　(1)A组CK及CK MB峰值浓度均显著低于B组(P<0. 05); (2)A组冠状动脉自发再通率高于B组(P<0. 05),A组无再流现象发生率低于B组(P<0. 05); (3)A组左室射血分数高于B组(P<0. 05); (4)A组心力衰竭发生率及再梗死率低于B组(P<0. 05)。结论　梗死前心绞痛可能促进AMI患者梗死相关动脉自发再通的发生,减少直接PCI术后无再流现象发生,改善患者左心室功能和临床预后。