ST peak during primary percutaneous coronary intervention predicts final infarct size,left ventricular function,and clinical outcome

Background and Purpose

One third of patients treated with primary percutaneous coronary intervention (PCI) for ST-elevation myocardial infarction develop a secondary increase in electrocardiographic ST segment (ST peak) during reperfusion. The purpose was to determine the clinical importance of ST peak during primary PCI.

Methods

A total of 363 patients with ST-elevation myocardial infarction were stratified to no ST peak or ST peak. Final infarct size and ejection fraction (EF) were assessed by cardiovascular magnetic resonance.

Results

Patients with ST peak had a larger infarct size (14% vs 10%; P = .003) and lower EF (53% vs 57%; P = .022). Rates of cardiac mortality (8% vs 3%; P = .047) and cardiac events (cardiac mortality and admission for heart failure; 19% vs 10%; P = .018) were higher among patients with ST peak, but not all-cause mortality (8% vs 5%; P = .46). In a multivariable Cox regression analysis, ST peak remained significantly associated with cardiac events (adjusted hazard ratio, 2.03 [1.08-3.82]).

Conclusion

ST peak during primary PCI is related to larger final infarct size, a reduced EF, and adverse cardiac clinical outcome.     

Significance of T-wave amplitude and dynamics at the time of reperfusion in patients with acute ST-segment elevation myocardial infarction treated with primary percutaneous coronary intervention

Background

Peri-interventional T-wave changes may reflect the microvascular reperfusion status and potentially carry early independent, prognostic information in patients with ST-elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (PCI).

Methods

The first available electrocardiogram (ECG) (index ECG) and the ECG recorded immediately post-PCI were analyzed for T-wave morphology in 207 patients with STEMI. Absolute T-wave amplitude was recorded and any change in T-wave amplitude from index ECG to post-PCI ECG was calculated. Continuous ST monitoring was performed from hospital arrival until 90 minutes after PCI. Maximum troponin level and left ventricular ejection fraction were evaluated before discharge. Final infarct size was assessed by myocardial perfusion imaging after 1 month.

Results

Large, positive T-wave amplitude in the index ECG and the post-PCI ECG was associated with delayed ST resolution after PCI. In the post-PCI ECG, T-wave amplitude was positively associated with troponin-T value (P < .001) and final infarct size (P = .036), and inversely associated with left ventricular ejection fraction (P < .001). However, T-wave amplitude in the post-PCI ECG was also associated with procedural increase in ST elevation (P < .001) and inversely associated with spontaneous ST resolution (P < .017). A net decrease in T-wave amplitude during reperfusion therapy was associated with faster microvascular reperfusion as evaluated by time to ST resolution.

Conclusion

Large T-wave amplitudes in static pre- and post-PCI ECGs are associated with delayed microvascular reperfusion, whereas the dynamic development of more negative T waves during PCI is associated with earlier microvascular reperfusion. However, in the acute setting, T waves provide little incremental information when compared to ST parameters available in the per-interventional phase.     

急性ST段抬高心肌梗死直接经皮冠状动脉介入术冠状动脉无复流患者的左室功能

目的　研究急诊经皮冠状动脉介入 (PCI)治疗冠状动脉 (冠脉 )无复流病人的左室功能。方法　自 1999年 1月至 2 0 0 2年 10月 ,回顾性分析北京朝阳医院心脏中心 4 97例急性ST段抬高心肌梗死 (STEMI)直接PCI患者的临床和影像资料。急诊PCI支架置入即刻 ,在无影响血流的血栓、栓塞、夹层、痉挛情况下 ,冠脉造影前向血流≤TIMI 2级为无复流 ,TIMI 3级为正常血流。冠脉无复流患者 5 8例 ,利用Excel随机函数表 ,由其余 4 39例急诊PCI冠脉前向血流恢复正常的患者中随机抽取6 0例 ,为正常血流组。结果　无复流和正常血流患者的肌酸肌酶峰值、Killip心功能分级、Q波计数、WMS有显著性差异 (P <0 0 5 )。正常血流患者术后 2周WMS改善 ,LVEF、CI、SVI增加 (P <0 0 5 )。正常血流合并心功能不全的患者术后 2周LVEF、CI、SVI增加 (P <0 0 5 ) ,LVEDV、LVESV(P <0 0 1)减少 ;而无复流合并心功能不全的患者LVEDV、LVESV增加 (P <0 0 1)。结论　无复流患者的心肌损害严重 ,梗死或濒临坏死的心肌范围广泛 ;室壁运动恢复较慢和局部心肌功能不良 ;左室舒缩功能降低     

替罗非班对高危NSTEMI患者急诊PCI治疗后左心室功能的影响

目的观察替罗非班对高危非ST段抬高型心肌梗死(non-ST-elevation myocardial infarction,NSTEMI)患者急诊经皮冠状动脉介入(percutaneaus coronary intervention,PCI)治疗后左心室功能及内皮功能的影响,进而探讨其作用机制。方法100例高危NSTEMI患者随机分为两组,实验组50例,PCI治疗前给予替罗非班,对照组50例未给予替罗非班。观察PCI治疗前、后心肌梗死溶栓(thrombolysis in myocardial infarction,TIMI)血流情况及主要心血管事件,PCI治疗后第7天及第90天测定左心室功能和内皮依赖性舒张功能等指标。结果实验组PCI治疗后等容舒张时间和主要心血管事件发生率显著低于同期对照组,差异有统计学意义(P<0.05),TIMI血流3级率、E/A、左心室射血分数和内皮依赖性舒张功能显著高于同期对照组,差异有统计学意义(P<0.05)。结论替罗非班可增加高危NSTEMI急诊PCI治疗后梗死相关动脉血流,改善左心室功能及内皮功能,并降低主要心血管事件的发生率。     

Association of TIMI Myocardial Perfusion Grade and ST-segment resolution with cardiovascular magnetic resonance measures of microvascular obstruction and infarct size following ST-segment elevation myocardial infarction

Background Impairment of coronary microvascular perfusion is common among patients with ST-segment elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (PCI). Cardiovascular magnetic resonance imaging (CMR) can identify microvascular obstruction (MO) following reperfusion of STEMI. We hypothesized that myocardial perfusion, as assessed by the Thrombolysis in Myocardial Infarction (TIMI) Myocardial Perfusion Grade (TMPG), would be associated with a CMR metric of MO in this population. Methods Twenty-one STEMI patients who underwent successful primary PCI were evaluated. Contrast-enhanced CMR was performed within 7 days of presentation and repeated at three months. TIMI Flow Grade (TFG), corrected TIMI Frame Count (cTFC), TMPG, MO, infarct size, and left ventricular ejection fraction (EF) were assessed. Results The median peak creatine phosphokinase (CPK) was 1,775 IU/l (interquartile range 838–3,321). TFG 3 was present following PCI in 19 (90%) patients. CMR evidence of MO was present in 52% following PCI. Abnormal post-PCI TMPG (0/1/2) was present in 48% of subjects and was associated with MO on CMR (90% MO with TMPG 0/1/2 vs. 18% MO with TMPG 3, P < 0.01). Abnormal post-PCI TMPG was also associated with a greater peak CK (median 3,623 IU/l vs. 838 IU/l, P < 0.001) and greater relative infarct size (17.3% vs. 5.2%, P < 0.01). Conclusion Among STEMI patients undergoing primary PCI, post-PCI TMPG correlates with CMR measures of MO and infarct size. The combined use of both metrics in a comprehensive assessment of microvascular integrity and infarct size following STEMI may aid in the evaluation of future therapeutic strategies.     

应变率成像对急性前壁心肌梗死冠脉介入治疗后左室局部收缩功能的评价

目的运用应变率成像（SRI）技术定量评价急性前壁心肌梗死患者经皮冠状动脉介入术（PCI）前后梗死相关血管供血区域局部收缩功能。方法对62例急性前壁心肌梗死患者行PCI术。血管开通后无复流13例（无复流组）,心肌灌注良好49例（灌注组）。分别于PCI术前、术后3d、1个月及6个月测量左前降支参与供血的9个室壁节段的沿长轴收缩期应变率（SR）并与术前比较,确定异常节段。结果两组各时点sR降低,灌注组术后不同时间点的SR均显著高于无复流组,绝大多数心肌节段SR较术前增加,且随着时间的推移,其SR逐渐增加;无复流组术后3d及1个月除极少数节段SR降低外,其他节段心肌SR与术前无明显差异;术后6个月部分心肌节段SR较术前及术后3d有所增加。结论SRI可动态观察急性前壁心肌梗死PCI术前、术后梗死相关血管供血区域心肌收缩功能,间接评估心肌灌注情况。     

急诊PCI对老年急性心肌梗死患者的疗效及左室重构的作用

目的观察急诊PCI对老年急性心肌梗死患者的临床疗效及恢复期左室重构的作用。方法98例老年急性心肌梗死患者（≥60岁）随机分为2组,其中PCI组50例,对照组48例。PCI组于发病12h内行急诊PCI术;对照组给于尿激酶150万u静脉溶栓治疗。两组患者均长期服用抗凝、抗血小板药物及冠心病二级预防药物,并分别于发病后1个月、6个月做心脏彩超了解心功能及左室重构情况,观察1年内主要不良心脏事件的发生情况。结果两组患者在发病1个月后左心室容积及射血分数差异无统计学意义;发病6个月后,PCI组左心室容积小于对照组,射血分数大于对照组,差异有统计学意义。PCI组主要不良心脏事件的发生率低于对照组,差异有统计学意义。结论对于老年急性心肌梗死患者,急诊PCI能阻止患者的左室重构,改善患者的远期左室功能,并能减少主要不良心脏事件的发生。     

Determinants of left ventricular thrombus formation after primary percutaneous coronary intervention for anterior wall myocardial infarction

Previous studies have reported that left ventricular (LV) thrombus is a complication in 10–56% of ST-segment elevation acute anterior wall myocardial infarctions (AWMI). Data suggest that changes in acute myocardial infarction management such as early anticoagulation, thrombolysis, and most recently, primary percutaneous coronary intervention (PCI), may decrease thrombus occurrence. Early time to reperfusion has been shown to decrease mortality and improve LV function recovery. To determine if door-to-balloon time (DTBT) affects the incidence of LV thrombus, we retrospectively analyzed data on 43 consecutive patients who underwent successful PCI of a primary acute ST-segment elevation AWMI. Transthoracic echocardiography was performed for detecting LV thrombus and measuring LV ejection fraction (EF) within 5 days on all patients (average time: 2.17 days post event). Nineteen patients underwent PCI within 2 h of arrival to the Emergency Department (Group A, average 88 min) and 24 patients underwent PCI with DTBT of more than 2 h (Group B, average 193 min). Clinically significant LV thrombus was detected in 35% of all patients. The incidence of LV thrombus formation in Group A was not significantly different from that in Group B (42.1% vs. 29.0%, respectively; P = 0.52). The risk of LV thrombus was independent of in-hospital anticoagulation and medical management, peak enzyme levels, and LVEF but did relate to age (odds ratio = 1.96, 95% CI 1.03–3.73, P = 0.04 per decade). No embolic events in hospital were observed (average hospital stay 9.2 days). We conclude that the incidence of LV thrombus remains high despite PCI. Also, we find that DTBT in patients presenting with an ST-segment elevation AWMI does not affect the incidence of LV thrombus formation. Increased age, however, does appear to increase the risk of LV thrombus development.     

急性ST段抬高性心肌梗死患者直接经皮冠状动脉介入治疗再灌注时间对ST段回落的影响

目的探讨直接经皮冠状动脉介入(percutaneous coronary intervention,PCI)治疗中症状发作-球囊扩张时间(symptom-onset-to-balloon,SOTB)对再灌注后心电图ST段的回落、住院期间左心室射血分数、6个月内总的主要心血管事件(包括心绞痛、再发心肌梗死、因心血管事件再入院、心力衰竭和死亡等)发生率的影响。方法回顾性分析2005年1月至2006年7月于北京大学深圳医院行直接PCI治疗的ST段抬高性心肌梗死(ST-elevation myocardial infarction,STEMI)患者225例的基线资料、心电图资料以及随访资料,比较不同时间SOTB(>3 h及≤3 h)术前、术后1 h ST段抬高总和恢复百分比(sumSTR)%、住院期间超声心动图所测的左心室射血分数、随访6个月的主要心血管事件发生率。结果SOTB≤3 h组PCI治疗后1 h ST段完全回落≥70%的患者比例明显高于SOTB>3 h组,差异有统计学意义(57.4%vs.43.2%,P=0.005);住院期间左心室射血分数高于SOTB>3 h组,差异有统计学意义(57.69%±7.64%vs.53.80%±9.03%,P=0.014);6个月主要心血管事件发生率低与SOTB>3 h组,差异有统计学意义(14.9%vs.35.4%,P=0.001)。结论 STEMI患者PCI治疗中SOTB短,ST段回落就迅速而完全,住院期间的左心室射血分数高,6个月主要心血管事件发生率低。     

优化急性ST段抬高型心肌梗死的直接经皮冠状动脉介入治疗

对ST段抬高型心肌梗死实施直接经皮冠状动脉介入治疗不应只是为获得TIMI 3级血流,而应是良好的心肌灌注。可通过上游使用血小板膜糖蛋白Ⅱb/Ⅲa受体拮抗剂、他汀类调脂药,个体化正确使用血栓抽吸装置,必要时延迟支架植入等手段,优化直接经皮冠状动脉介入治疗术的效果。     

急性心肌梗死经皮冠状动脉介入治疗患者心肌胶原与左心室重构的关系

目的探讨急性心肌梗死经皮冠状动脉介入(percutaneous coronary intervention,PCI)治疗患者心肌胶原变化与左心室重构关系。方法选择2011年12月至2012年9月入住宝安区人民医院的急性心肌梗死患者共70例为研究对象。按照入院后患者是否行直接PCI治疗分为直接PCI治疗组(n=30)和择期PCI治疗组(n=30),其中10例(其中直接PCI治疗组5例,择期PCI治疗组5例)患者出院后不愿意随访。所有入选患者术前、术后3 d及术后30 d均分别以酶联免疫吸附法测定血清Ⅰ型C端胶原前肽(carboxy-terminal propeptide of type I procollagen,PICP)、Ⅲ型N端胶原前肽(amino-terminal propeptide of type III procollagen,PⅢNP)和Ⅰ型C端胶原末肽(carboxy-terminal telopeptide of collagen type I,CITP)浓度;术后3 d、术后30 d均行心脏超声检查;术后30 d行单光子发射计算机断层显像测量心肌梗死面积。结果术后30 d直接PCI治疗组血清PICP、PⅢNP、CITP浓度较择期PCI治疗组明显降低,差异有统计学意义[PICP:(7.76±1.47)ng/mL vs.(10.73±1.67)ng/mL,P﹤0.05;PⅢNP:(11.17±4.72)ng/mL vs.(37.80±6.83)ng/mL,P﹤0.05;CITP:(31.18±6.78)ng/mL vs.(45.10±9.70)ng/mL,P﹤0.05]。术后30 d直接PCI治疗的左心室舒张末期内径、左心室收缩末期内径、心肌梗死面积明显低于择期PCI治疗组[(46.57±6.10)mm vs.(52.63±6.50)mm,P﹤0.05;(34.25±4.86)mm vs.(37.33±3.56)mm,P﹤0.05;22.8%±3.4%vs.28.2%±6.8%,P﹤0.05]。结论直接PCI治疗可有效地挽救濒死的心肌,减轻心室重构,保护心功能,改善患者远期预后。检测血清心肌胶原浓度能作为预测心室重构的指标。     

急性前壁心肌梗死经皮冠状动脉血运重建术后ST段持续抬高对其晚期左室功能的影响

目的:探讨急性前壁心肌梗死(MI)患者行直接经皮冠状动脉血运重建术(PCI)后心电图ST段持续 性抬高对MI后晚期左室功能和临床预后的影响。方法:选择因急性前壁MI入院成功接受直接PCI的患者72 例,动态观察PCI前后心电图ST段的变化,以PCI后1hST段下降>50%为ST段下降组,相反为ST段抬高 组。应用超声心动图测定MI后早期(2～3周)和晚期(5～6个月)左室功能和室壁活动异常的变化,并随访其间 心血管事件的发生率。结果:ST段下降组53例(73.6%),ST段抬高组19例(26.4%)。MI后早期两组间左室 功能和室壁活动异常(VWMA)无明显差异;晚期ST段抬高组左室射血分数(LVEF)明显低于ST段下降组(P <0.05),而左心室舒张末期容积指数(LVEDVI)、左心室收缩末期容积指数(LVESVI)和VWMA积分均明显高 于ST段下降组(P<0.05,P<0.01)。随访期间ST段抬高组主要心血管事件的发生率略高于ST段下降组, 但差异无统计学意义。ST段下降组MI前心绞痛和直接支架术的比例明显高于ST段抬高组(P<0.05)。结 论:ST段持续性抬高者MI晚期左室功能较差,有MI前心绞痛和直接支架术者PCI后ST段持续性抬高的发生 率可能较低。     

Association of angiographic perfusion score following percutaneous coronary intervention for ST-elevation myocardial infarction with left ventricular remodeling at 6 weeks in GRACIA-2

Higher angiographic perfusion score (APS) following percutaneous coronary intervention (PCI) for ST-segment elevation myocardial infarction (STEMI) has been shown to be associated with improved clinical outcomes. The association between APS after STEMI and left ventricular remodeling as assessed by volumetric parameters derived from left ventriculography has not been assessed. Methods The APS (the arithmetic sum of the TIMI Flow Grade (TFG) and TIMI Myocardial Perfusion grade (TMPG) before and after percutaneous coronary intervention (PCI), range of 0–12) was assessed in 168 patients from the GRACIA-2 trial. Left ventriculograms performed in the 30° right anterior oblique projection were obtained among 148 patients at initial angiography (prior to PCI) and at 6 weeks. The association of APS with markers of left ventricular remodeling at 6-weeks was examined using left ventricular ejection fraction, delta end systolic volume, delta stroke volume and wall motion index. Results Full perfusion (APS 10–12), as compared to partial perfusion (APS 4–9) or failed perfusion (APS 0–3), was associated with a greater left ventricular ejection fraction (61.6% ± 10.0 vs. 56.9% ± 12.5 vs. 49.8% ± 16.9, P = 0.015), a decrease in left ventricular end systolic volume indicating favorable remodeling (mean −4.1 cc ± 17.3 vs. +2.0 cc ± 17.3 vs. +9.8 cc ± 16.1, P = 0.015), a greater improvement in left ventricular stroke volume (mean +13.7 cc ± 17.1 vs. +6.7 cc ± 15.5 vs. +1.2 cc ± 13.4, P = 0.009) and a decreased wall motion index (number of chords in the hypokinetic region) (mean 15.1 ± 16.4 vs. 21.4 ± 20.5 vs. 32.9 ± 22.1, P = 0.026) at 6 weeks. Conclusion In conclusion, among patients treated with combined reperfusion and revascularization strategies for STEMI, higher APS is associated with more favorable markers of left ventricular remodeling and improved 6-week left ventricular function. The GRACIA-2 trial was funded by unrestricted grants from the La Red Temática de Enfermedades Cardiovasculares (RECAVA) from the Instituto de Salud Carlos III of the Spanish Ministry of Health, the Spanish Society of Cardiology, Guidant CO, and Lilly CO. Additional support was obtained from Guidant CO to reimburse interventional centers for the cost of stents. No additional funding was received for the present analysis.     

Impact of early, late, and no ST-segment resolution measured by continuous ST Holter monitoring on left ventricular ejection fraction and infarct size as determined by cardiovascular magnetic resonance imaging

Background

The goal of this study is to determine the predictive value of ST-segment resolution (STR) early after percutaneous coronary intervention (PCI), late STR, and no STR for left ventricular ejection fraction (LVEF) and infarct size (IS) by cardiovascular magnetic resonance (CMR) at follow-up in patients with ST-segment elevation myocardial infarction.

Methods

The analysis included 199 patients who were enrolled in the PRoximal Embolic Protection in Acute myocardial infarction and Resolution of ST-Elevation trial and in whom both continuous ST Holter and CMR at follow-up were available. Patients were stratified into 3 groups: (1) early complete (≥70%) STR measured immediately after last contrast injection (n = 113); (2) late complete STR (n = 52), defined as complete STR from 30 to 240 minutes after PCI; and (3) no complete STR after 240 minutes (n = 34).

Results

Patients with early STR had more preserved LVEF and smaller IS compared to patients with late STR or no STR (LVEF: early STR, 54% ± 8%; late STR, 46% ± 13%; no STR, 43% ± 11%; and IS: 3.9 ± 3.3 g/m²; 8.0 ± 6.9 g/m²; 12.0 ± 6.0 g/m²; respectively; all P < .0001). Early STR was independently predictive for LVEF (β = 8.5; P = .0005) and IS (β = −7.0; P < .0001). Late STR was not predictive for LVEF (β = 1.6; P = .51) but predictive for IS (β = −3.5; P = .003).

Conclusions

Patients with early complete STR after primary PCI have better preserved LVEF and smaller IS. Patients with late complete STR do not have better preserved LVEF but do have smaller IS. ST-segment resolution is a strong, independent predictor of LVEF and IS as assessed by CMR.     

The relationship between serial postinfarction T wave changes and infarct size and ventricular function as determined by cardiac magnetic resonance imaging

Background

The value of sequential T wave changes on the electrocardiogram (ECG) has less well been described than ST-segment changes in the follow-up of patients with myocardial infarction (MI). We investigated whether the amplitude of T wave positivity correlates with infarct size (IS) and left ventricular ejection fraction (LVEF) measured using cardiac magnetic resonance imaging 3 months after reperfusion therapy.

Materials and Methods

Fifty-five patients with a first acute MI referred for primary percutaneous coronary intervention were included. Electrocardiograms were analyzed within 4 hours after reperfusion and at 3 months, measuring T wave ampitudes in 2 contiguous infarct-related leads, summed up as one value called T wave amplitude. Cardiac magnetic resonance imaging was performed at 3 months of follow-up. Correlations between T wave amplitude, IS, and LVEF were tested with Pearson r correlation coefficient test. Subanalyses were performed using a 2-sample t test.

Results

A good correlation was found between LVEF and IS (r = −0.7, P < .0001). Most of the patients had inferior MI location (69%). In this group, there were significant positive correlations between the amount of T wave positivity and both IS (r = −0.40, P = .012) and LVEF (r = 0.33, P = .043). Results were similar in patients with and without an increase in T wave amplitude during follow-up.

Conclusions

In this study of patients with reperfused MI, patients with inferior locations demonstrated a statistically significant relationship between the amount of positivity of T wave amplitude and both IS and LVEF measured at 3 months. Furthermore, these results were independent of whether the T wave positivity was persistent or evolutionary between the immediate postreperfusion and 3-month ECG recordings.     

Effect of clopidogrel on 1-year mortality in hospital survivors of acute ST-segment elevation myocardial infarction in clinical practice.

AIMS: We sought to assess the effect of clopidogrel on clinical events 1 year after discharge in survivors of ST-elevation myocardial infarction (STEMI) in clinical practice. METHODS AND RESULTS: We analysed data of consecutive survivors of acute STEMI and either concomitant therapy with aspirin or aspirin plus clopidogrel at discharge, who were prospectively enrolled in the Acute Coronary Syndromes (ACOS) registry between July 2000 and November 2002. A total of 5886 (3795 with and 2091 without clopidogrel) patients were included into this analysis. Patients were divided into three groups according to the initial reperfusion therapy: no reperfusion therapy (n=1445), fibrinolysis (n=1734), or primary PCI (n=2707). The multivariable analysis for 12+2 month mortality after discharge using the propenstiy score with adjustment for baseline characteristics and treatments (age, sex, diabetes mellitus, hypertension, prior MI, hyperlipidaemia, renal insufficiency, cardiogenic shock, heart rate, systolic blood pressure, anterior infarct location, reduced left ventricular function, elective revascularization, beta-blockers, statins, ACE-inhibitors) showed that mortality was significantly lower in the aspirin plus clopidogrel group compared with the aspirin group in the total group and patients with reperfusion therapy [total group odds ratio (OR) 0.48, 95% confidence interval (CI) 0.48-0.61; no reperfusion therapy OR 0.96, 95% CI 0.65-1.45; fibrinolysis OR 0.53, 95% CI 0.32-0.87; primary percutaneous coronary intervention OR 0.38, 95% CI 0.23-0.62]. CONCLUSION: In clinical practice, adjunctive therapy with clopidogrel, in addition to aspirin, in survivors after STEMI is associated with a reduction in 1-year mortality in patients treated with early reperfusion therapy.     

Effect of early use of ivabradine on left ventricular remodeling after primary percutaneous coronary intervention in patients with acute ST-segment elevation myocardial infarction: A pilot test

Objective

To investigate the effect of early use of ivabradine on left ventricular remodeling after primary percutaneous coronary intervention (PCI) in patients with acute ST-segment elevation myocardial infarction (STEMI).

Methods

A total of 66 STEMI patients with sinus rhythm and the resting heart rate ≥80 bpm after successful emergency PCI were included. The patients in the test group were treated with ivabradine combined with metoprolol at 12 hr after PCI, while the control group was given only metoprolol orally. Their resting heart rate was controlled to <70 bpm at discharge and followed for 180 days. Heart rate and blood pressure were measured regularly. Echocardiogram was performed. N-terminal pro-B-type natriuretic peptide (NT-proBNP), high sensitivity troponin T, high sensitivity troponin I, and high sensitivity C-reactive protein were measured. The major adverse cardiovascular events during hospitalization and follow-up period were recorded.

Results

Compared with the control group, the heart rate of the test group decreased significantly (p < .05). Compared with the control group, the left ventricular end-diastolic volume and left ventricular end-systolic volume were significantly decreased while left ventricular ejection fraction was significantly increased in the test group at 90 days after operation. NT-proBNP of the test group was significantly lower than that of the control group at 7 days after operation (p < .05).

Conclusion

For STEMI patients, early use of ivabradine combined with standard therapy such as β-blocker after successful reperfusion can achieve effective heart rate control, with great safety and tolerance. But the effect of ivabradine on left ventricular remodeling is uncertain.

     

The impact of introduction of Code-STEMI program on the reduction of door-to-balloon time in acute ST-elevation myocardial infarction patients undergoing primary percutaneous coronary intervention: A single-center study in Saudi Arabia

Objectives

This study was conducted to evaluate the effect of direct emergency department activation of the catheterization lab on door-to-balloon time (D2BT) and outcomes of acute ST-elevation myocardial infarction (STEMI) patients at a major tertiary care hospital in Riyadh, Saudi Arabia.

急性ST段抬高型心肌梗死直接冠脉成形术ST段变化的临床价值

目的探讨急性ST段抬高型心肌梗死患者行直接冠脉成形术,术前和术后ST段变化对远期心血管事件的临床预测价值。方法对54例ST段抬高型心肌梗死患者行直接冠脉成形术,观察术前和术后1h心电图ST段变化,计算ST段回落指数。对所有患者随访12个月,观察12个月内心血管事件（猝死、心肌梗死、再狭窄、再次血管重建、慢性心衰）发生情况。对ST段回落指数和随访心血管事件行ROC分析,并通过COX比例风险模型多因素回归分析ST段回落指数对12个月终点事件的独立预测价值。结果在12个月的随访中,发生心源性死亡2例,再发心绞痛4例,慢性心衰7例。ST段回落指数临界点取63％时,对目标心脏事件预测的ROC曲线下面积0．843,灵敏度76．9％,特异度78．0％。COX比例风险模型多因素回归分析显示ST段回落指数对目标终点事件具有独立预测价值。结论急性ST段抬高型心肌梗死患者行直接PCI术,术前和术后ST段的变化即ST段回落指数对术后12个月预后具有独立预测价值。