急性前壁ST段抬高心肌梗死伴下壁导联ST段不同改变与冠状动脉病变的关系

目的:探讨急性前壁ST段抬高心肌梗死伴下壁导联ST段不同改变,与冠状动脉病变的关系以及对患者近期预后的影响。方法:回顾性分析308例急性前壁心肌梗死患者心电图表现,根据下壁导联心电图ST段变化分为两组:A组为Ⅱ、Ⅲ、aVF中至少2导联抬高;B组为Ⅱ、Ⅲ、aVF中至少2导联压低。比较两组之间心肌梗死面积,左心室重构指标,梗死相关动脉相关性以及近期预后。结果:与B组相比,A组CK-MB最大值较低[(111.46±64.65)vs.(179.79±96.06)IU/L,P<0.0l];左心室射血分数较高,为[(52.28±12.62)vs.(46.81±5.79)%,P<0.01];室壁运动分数低[(20.38±5.65)vs.(38.48±5.28),P<0.01]。两组梗死相关血管(infarct related artery,IRA)A组患者中30例(35.29%)为包绕心尖部前降支(wrapped left anterior descending artery,WLAD),55例(64.71%)为非包绕心尖部前降支(non-wrapped left anterior descending artery,NWLAD),B组患者中7例(3.14%)为WLAD,216例(96.86%)为NWLAD,两组梗死相关血管比较,差异有统计学意义(P<0.01)。下壁导联ST段抬高幅度较大,并伴有ST段抬高幅度V1>V3导联。室壁运动分数与左心室功能呈负相关;与心电图抬高导联数呈负相关,与Ⅱ、Ⅲ、aVF导联抬高幅度呈负相关;与sumSTE呈负相关;并与血浆尿素氮、LDL、TG及体质量呈负相关。主要心血管事件(major cardiovascular events,MACE)两组间差异无统计学意义。结论:IRA为左前降支(left anterior descending artery,LAD)的急性前壁ST段抬高心肌梗死时,下壁导联ST段改变可能与LAD长度和病变部位有关;前壁导联合并下壁导联ST段同时抬高的患者若IRA为WLAD,其梗死面积较小,心功能较好。     

不同罪犯血管引起的急性下壁心肌梗死临床特点

目的分析不同罪犯血管引起的急性下壁心肌梗死患者的临床特点。方法纳入发病12 h内入院的急性下壁心肌梗死患者268例,急诊行冠状动脉造影(CAG)检查,根据不同罪犯血管将患者分为2组,右冠状动脉(RCA)组:216例为闭RCA塞;左回旋支冠状动脉(LCX)组:52例为LCX闭塞。对两组临床特征和心电图进行比较分析。结果合并右室心肌梗死,心源性休克,RCA组心力衰竭显著高于LCX组(P0.05);RCA组左室射血分数(LVEF)显著低于LCX组[(51±8)%vs.(58±10)%,P0.05];但住院死亡率等两组比较差异无统计学意义(P0.05);心电图STⅢ抬高/STⅡ抬高≥1、STV4R抬高≥1 mm、高度房室传导阻滞(AVB)、室速/室颤(VT/VF)各项指标在RCA组显著高于LCX组(P0.01)。结论 RCA和LCX梗死引起的急性下壁心肌梗死临床特征和心电图表现有差异,心电图Ⅱ、Ⅲ及V4R导联ST段变化能预测急性下壁心肌梗死患者犯罪血管,对临床治疗和预后有指导作用。     

急性前壁心肌梗死伴不同下壁导联ST段改变的临床特点

目的探讨ST段抬高急性前壁心肌梗死(简称心梗)伴不同下壁导联ST段改变患者的梗死相关血管以及梗死面积及心功能情况。方法73例急性前壁心梗患者,根据入院时心电图下壁导联ST段改变情况将患者分为3组:A组为Ⅱ、Ⅲ、aVF中至少两个导联ST段抬高;B组为Ⅱ、Ⅲ、aVF中至少两个导联ST段压低,C组为Ⅱ、Ⅲ、aVF中少于两个导联ST段有改变。比较三组CK最大值,左室射血分数以及梗死相关血管(IRCA)。结果CK最大值3组比较A组最低(1280±531IU/Lvs2034±911,1677±630IU/L,P<0.01);左室射血分数A组最高(0.54±0.09vs0.48±0.07,0.47±0.08,P<0.01);三组IRCAA组中85.7%的患者位于“绕过心尖的左前降支(LAD)”的中远段,有14.3%的患者位于右冠状动脉(RCA)的近段;B组的患者中全部为非“绕过心尖的LAD”,其中有70.4%的患者位于非“绕过心尖的LAD”的近段;C组中有96.7%的患者为非“绕过心尖的LAD”,其中有73.3%的患者位于非“绕过心尖的LAD”的近中段,三组比较差异有显著性(P<0.01)。结论IRCA为LAD的急性前壁心梗时下壁ST段改变可能与LAD长度和病变部位有关;前壁合并下壁ST段同时抬高的患者若IRCA为“绕过心尖的LAD”,其梗死面积较小,心功能较好。     

急性前壁心肌梗死时下壁导联ST段压低的临床意义

目的 :探讨急性前壁心肌梗死合并下壁导联 ST段压低的临床意义。方法 :回顾性分析2 2例首发急性前壁心肌梗死患者的心电图、冠状动脉及左室造影资料。结果 :急性前壁心肌梗死时下壁导联 ( 、 、a VF) ST段下移≥ 0 .0 5 m V组与 <0 .0 5 m V组的 、a VL导联 ST80 值有显著性差异 ( P <0 .0 5 ) ;两组的左前降支 6段 ( LAD6 )或 LAD始部病变的发生率也有显著性差异 ( P <0 .0 5 ) ;下壁导联 ST段压低≥ 0 .0 5 m V对 L AD6 或 LAD始部病变预测价值的敏感性及特异性分别是 : 导联 5 9%、5 0 % ; 导联 83%、70 % ;a VF导联 83%、70 %。结论 :急性前壁心肌梗死时下壁导联ST段压低预示 LAD6 或 L AD始部病变是高前侧壁发生透壁性心肌缺血的“镜像”反应 ,表现为 、a VL导联 ST段抬高 ;它与右冠状动脉、左旋支、多支病变以及胸前导联 ST段抬高程度无关     

93例急性心肌梗死患者的心电图及冠脉造影分析

目的探讨急性心肌梗死患者心电图sT改变的导联与冠状动脉罪犯血管的关系。方法对93例急性心肌梗死患者心电图ST段改变与选择性冠状动脉造影结果进行对比分析。结果心电图V1-V4sT抬高伴Ⅱ、Ⅲ、aVFST段下移的罪犯血管主要为左前降支（LAD）,少数前壁心肌梗死伴下壁sT段抬高;Ⅱ、Ⅲ、aVFST抬高伴V1-V4 ST段下移的主要罪犯血管为右冠状动脉（RCA）,少部分为左回旋支（LCX）,极少部分为LAD;胸前导联T高尖与ST抬高导联不一致可排除LAD;高侧壁Ⅰ、AVLST段抬高多数罪犯血管为LCX。结论心电图ST改变的导联对急性心肌梗死罪犯血管能进行初步预测。     

急性前壁心肌梗死下壁导联ST段变化与前降支形态和梗死部位的关系

目的探讨急性前壁心肌梗死时下壁导联ST段的变化与不同前降支形态和梗死部位关系。方法根据下壁导联心电图ST段改变情况,将67例首发急性前壁心肌梗死病例分为ST段压低组,ST段抬高组和ST段无变化组,与冠状动脉造影结果对照,分析各组心电图变化与前降支形态和梗死部位的关系。结果梗死相关部位在前降支近端者ST段压低组中占81.25%,ST段抬高组占20%,ST段无变化组占46.34%(P<0.01);LAD返折支配1/4以上下壁在ST段压低组中占6.25%,ST段抬高组占70%,ST段无变化组占29.27%(P<0.01)。结论急性前壁心肌梗死时下壁导联ST;段变化与前降支梗死部位和形态有关。下壁导联ST段压低提示前降支近端梗死,ST段抬高提示前降支远端梗死且存在前降支返折。     

aVR导联对急性前壁心肌梗死患者梗死相关血管的预测价值及临床意义

目的 研究aVR导联ST段抬高对急性前壁心肌梗死患者梗死相关血管的预测价值及临床意义.方法 101例首次急性前壁心肌梗死患者根据aVR导联有无ST段抬高分为A组（有ST段抬高）33例和B组（无ST段抬高）68例,对其冠脉造影、心脏彩超结果和临床资料进行比较.结果 ①梗死相关血管为左主干（LM）病变A组9例,B组2例,两组差异有统计学意义（P＜0.01）;梗死相关血管为左前降支（LAD）近端病变A组22例,B组26例,两组差异有统计学意义（P＜0.01）;多支血管病变A组15例,B组16例,两组差异有统计学意义（P＜0.01）.②A组发生心脏事件11例,B组9例,两组差异有统计学意义（P＜0.01）.③A组LVEF值明显低于B组（P＜0.01）.④A组CK-MB峰值明显高于B组（P＜0.01）.结论 aVR导联对急性心肌梗死患者梗死相关血管的判定及预后有重要的临床价值.     

∑ST_(V1-V3) ↓/∑ST_(Ⅱ、Ⅲ、aVF) ↑指标在识别急性下壁心肌梗死罪犯血管中的价值

目的分析∑STV1-V3↓/∑STⅡ、Ⅲ、aVF↑指标识别急性下壁心肌梗死(简称心梗)罪犯血管的价值。方法60例急性下壁心梗明确诊断单支冠状动脉闭塞[右冠状动脉(RCA)或左回旋支(LCX)]的患者,分析罪犯血管开通前心电图。比较∑STV1-V3↓/∑STⅡ、Ⅲ、aVF↑指标与常用指标(Ⅱ导联和Ⅲ导联ST段抬高程度的比较)预测价值的差异。结果①∑STV1-V3↓/∑STⅡ、Ⅲ、aVF↑≤1在预测RCA闭塞中敏感度高于STⅢ↑﹥STⅡ↑(91.3%vs 87.0%)。②预测LCX闭塞∑STV1-V3↓/∑STⅡ、Ⅲ、aVF↑>1有相对高的特异度、敏感度、阳性预测值、阴性预测值(91.3%、57.1%、66.7%、87.5%)。结论∑STV1-V3↓/∑STⅡ、Ⅲ、aVF↑指标在识别急性下壁心梗的罪犯血管中有重要价值。     

心电图ST段改变判断急性下壁心肌梗死患者梗死相关血管的意义

目的探讨急性下壁心肌梗死时心电图ST段改变对心肌梗死梗死相关动血管(IRA)的判断价值。方法通过对84例急性下壁心肌梗死的患者的心电图Ⅰ、aVL、Ⅱ、Ⅲ、aVR、V5、V6导联ST段偏移进行分析,并与冠状动脉造影结果进行对比。结果 (1)IRA为右冠状动脉(RCA)68例,左冠状动脉回旋支(LCX)16例。(2)ST↑ⅢST↑Ⅱ提示IRA为RCA的敏感性是93%,特异性是94%,阳性预测值(PPV)是98%,阴性预测值(NPV)是79%;ST↑ⅢST↑Ⅱ提示IRA为LCX的敏感性是81%,特异性是97%,PPV是87%,NPV是96%。(3)ST↓V3/ST↑Ⅲ的值0.5提示IRA为RCA的敏感性是90%,特异性是94%,PPV是98%,NPV是68%;ST↓V3/ST↑Ⅲ的值1.2提示IRA为LCX的敏感性是81%,特异性是97%,PPV是87%,NPV是97%。(4)ST↓aVLST↓I提示IRA为RCA的敏感性是91%,特异性是81%,PPV是95%,NPV是68%。(5)aVR导联ST段压低提示IRA为RCA的敏感性是88%,特异性是87%,PPV是97%,NPV是64%;aVR导联ST段抬高提示IRA为LCX的敏感性是81%,特异性是94%,PPV是76%,NPV是95%。(6)Ⅱ、Ⅲ、aVF导联ST段抬高伴V5、V6导联ST段抬高对梗死相关血管为RCA或LCX无预测价值。结论常规12导联心电图ST段偏移对判断急性下壁心肌梗死梗死相关血管有重要的预测价值。     

急性前壁心肌梗死患者体表心电图与梗死相关动脉关系的探讨

目的　探讨前壁急性心肌梗死 (AMI)患者体表心电图 (ECG)改变与梗死相关动脉 (IRA)定位的关系。方法　对 84例前壁AMI患者的ECG与冠状动脉造影 (CAG)的资料进行回顾性对比分析。结果　STⅠ、aVL 抬高 ,STⅡ、Ⅲ、aVF压低时提示前壁、广泛前壁AMI的IRA为左前降支 (LAD)近段闭塞而不是LAD远段闭塞 ) (P <0 0 5及P <0 0 0 1)。STⅠ、aVL抬高 ,STⅡ、Ⅲ、aVF压低时前间壁AMI的IRA不能判断为LAD或右冠状动脉 (RCA) (P >0 0 5 )。结论　前壁、广泛前壁AMI时STⅡ、Ⅲ、aVF压低 ,STⅠ、aVL抬高提示IRA为LAD近段 ,而前间壁AMI时STⅡ、Ⅲ、aVF压低 ,STⅠ、aVL抬高不能判断IRA为LAD或RCA。     

心电图诊断急性下壁，前壁心肌梗塞相关动脉的价值

目的：分析急性下壁、前壁心肌梗塞患者心电图表现及梗塞相关动脉的分布特点,评价心电图诊断急性下壁、前壁心肌梗塞相关动脉的价值。方法：对26例急性下壁心肌梗塞、29例急性前壁心肌梗塞患者的心电图和冠状动脉造影资料进行回顾性比较分析。结果：急性下壁心肌梗塞（26例）的梗塞相关动脉为右冠状动脉（RCA）者19例（73％）。回旋支（LCX）6例（23％）;急性前壁心肌梗塞（29例）的梗塞相关动脉为前降支（LAD）者26例（90％）;下壁心肌梗塞相关动脉为RCA的19例中Ⅱ、Ⅲ,aVF导联ST段上移18例（94％）,STⅢ↑／STⅡ↑〉1者16例（84%）。结论：急性下壁、前壁心肌梗塞的心电图表现与梗塞相关动脉有关,有较高的临床诊断价值。     

立体心电向量图对心肌梗死病变血管定位的价值

目的 对比分析常规心电图(ECG)和立体心电向量图(3D-VCG),评价3D-VCG在心肌梗死相关动脉(IRA)定位上的应用价值.方法 114例临床确诊心肌梗死患者,经冠状动脉造影,将冠状动脉单支完全闭塞或狭窄≥75%者,分成左前降支(LAD)、左回旋支(LCX)、右冠状动脉(RCA)共3个IRA组,分别分析其ECG和...     

Clinical and angiographic characteristics of patients with combined anterior and inferior ST-segment elevation on the initial electrocardiogram during acute myocardial infarction

Objective

We evaluated the significance of combined anterior and inferior ST-segment elevation on the initial electrocardiogram (EKG) in patients with acute myocardial infarction (AMI) and correlated it with AMI size and left ventricular (LV) function.

Methods

We analyzed admission EKGs of 2996 patients with AMI from the GUSTO-I angiographic substudy and the GUSTO-IIb angioplasty substudy who underwent immediate angiography. In all, we identified 1046 patients with anterior ST elevation (ST-segment elevation in ≥2 of leads V₁-V₄) and divided them into 3 groups: Group 1, anterior + inferior ST elevation (ST elevation in ≥2 of leads II, III, aVF, n =179); Group 2, anterior ST elevation only (<2 of leads II, III, aVF with ST elevation or depression, n = 447); Group 3, anterior ST elevation + superior ST elevation (ST depression in ≥2 of leads II, III, aVF, n = 420).

Results

Cardiac risk factors, prior AMI, prior percutaneous transluminal coronary angioplasty or coronary artery bypass graft, Killip class, and thrombolytic therapy assignment did not differ among the 3 groups. Group 1 patients had greater number of leads with ST elevation compared to Groups 2 and 3 (ST elevation in ≥6 leads 83% vs 22% vs 49%, P = .001). Despite greater ST-segment elevation, Group 1 patients had a lower peak CK level (median baseline peak CK 1370 vs 1670 vs 2381 IU, P = .0001) and less LV dysfunction (median ejection fraction 0.53 vs 0.49 vs 0.45, P = .0001; median number of abnormal chords 21 vs 32 vs 40, P = .0001). Angiographically, Group 1 had 2 distinct subsets of patients with either right coronary artery (RCA) (59%) or left anterior descending coronary artery (LAD) (36%) occlusion. In contrast, the infarct-related artery (IRA) was almost entirely the LAD in Groups 2 and 3 (97%). Further, the site of IRA occlusion in Group 1 was mostly proximal RCA (67%) in the RCA subgroup and mid or distal LAD (70%) in the LAD subgroup. ST-segment elevation in lead V₁ ≥ V₃ and absence of progression of ST elevation from lead V₁ to V₃ on the EKG differentiated IRA-RCA from IRA-LAD in patients with combined anterior and inferior ST elevation.

Conclusions

The AMI size and LV dysfunction in patients with anterior ST elevation is directly related to the direction of ST segment deviation in the leads II, III, aVF; least with inferior ST elevation, intermediate with no ST deviation, and maximal with superior ST elevation (inferior ST depression). Despite greater ST-segment elevation, patients with combined anterior and inferior ST elevation have limited AMI size and preserved LV function. Angiographically, they comprise 2 distinct subsets with either proximal RCA or mid to distal LAD occlusion. A predominant right ventricular and limited inferior LV AMI from a proximal RCA occlusion, or a smaller anterior AMI from a more distal occlusion of LAD may explain their limited AMI size despite greater ST elevation.     

体表心电图预测梗死相关动脉及部位的敏感性和特异性

目的总结体表心电图（ECG）判断ST段抬高心肌梗死（STEMI）患者的梗死相关动脉（IRA）的流程,确定其敏感性、特异性和准确性。方法入选896例STEMI患者。根据公认的ECG判断标准,制订相应流程,判断IRA及其具体部位,并与即刻冠状动脉造影对比,确定流程的敏感性、特异性和准确性。结果判断左主干病变的敏感性为100%、特异性99%和准确性99%;判断前降支病变的敏感性、特异性和准确性分别为99%、99%和99%,其中近段为84%、90%和88%,中远段为57%、94%和88%;判断回旋支病变的敏感性、特异性和准确性分别为64%、95%和91%;判断右冠状动脉病变的敏感性、特异性和准确性为89%、92%和91%,其中近段为51%、96%和88%,中远段为68%、92%和85%。结论本研究的流程可以准确判断左主干、前降支和右冠状动脉近段病变,但区分回旋支和右冠状动脉中远段病变时有一定限度。     

aVR导联对前壁心肌梗死相关血管定位的作用

目的通过与冠状动脉造影（CAG）对比，研究aVR导联ST段改变的特征。对急性前壁心肌梗死（AAMI）的梗死相关动脉（IRA）阻塞部位的定位。方法对比89例急性前壁心肌梗死病人．其中左前降支近段（PS）闭塞43例、左前降支远段（DS）闭塞46例，胸痛发作12h内的心电图。结果两组胸导联的ST段抬高无明显差异，PS组aVR导联ST段抬高较明显（0．94±0．48mmvs0．30±0．56mm．p=0．021）：PS组Ⅱ、Ⅲ、aVF导联ST段压低较显著（分别为-1．21±0．72mm vs S-0．64±0．53mm。p=0．010；-1．63±0．92mmvs-0．98＋0．39mm．／9=0．016；-1．40±0．66mm vs -0．85±0．32mm，／9=0．000）。在胸导联ST段抬高的同时．aVR导联ST段抬高预测左前降支（LAD）近段闭塞的敏感性（Se）、特异性（Sp）、符合率（CR）、阳性预测值（PPV）、阴性预测值（NPV）分别为60．47％、93．48％、77．53％、89．66％、71．67％。结论在胸导联ST段抬高的同时合并aVR导联ST段抬高和／或下壁导联的ST段压低，可预测左前降支近段闭塞。     

Differentiating the infarct-related artery on initial electrocardiogram in single or multi-vessel disease in acute inferior myocardial infarction and evaluating involvement of vessels using correspondence analysis

Initial electrocardiography changes were compared prospectively with the findings of coronary angiography to predict the infarct-related artery (IRA) in cases of single- and multi-vessel disease and to demonstrate the relationship between other coexisting coronary involvements and IRA in patients who presented with acute inferior myocardial infarction (AMI). ST elevations or depressions of at least 1 mm (0.1 mV) were evaluated in the leads I, aVL, and V1-V6. Of the 160 patients hospitalized due to inferior AMI, 153 (96%) underwent coronary angiography using standard methods. The angiograms were screened for stenotic lesions using quantitative coronary angiography to confirm significance, which was considered >50% vessel lumen diameter reduction. Among single-vessel involvements, the IRA was either the circumflex artery (Cx) or right coronary artery (RCA). In conditions in which IRA was detected as either Cx or RCA, 1-, 2-, and 3-vessel involvements were also detected. Correspondence analysis was performed to show the vessel involvements accompanying IRA. Compared with patients with IRA as RCA, the presence of ST depressions in the leads V1 or V2 and aVL were more frequently seen in patients with IRA as Cx (p=0.000, p=0.015, respectively). Among all vessel involvements in which IRA was either Cx or RCA, a ST-segment depression in leads V1 or V2 (p=0.000) and aVL (p=0.000) and a ST-segment elevation in lead I (p=0.005) were considered to be significant for Cx, and a ST-segment depression in lead I for RCA involvement (p=0.010). According to correspondence analysis, the most frequent single-vessel involvement seen in inferior AMI was RCA; when IRA was RCA, a multi-vessel involvement included RCA and Cx; and when IRA was Cx, a single-vessel involvement included the left anterior descending (LAD) artery most frequently, and RCA+LAD less frequently (p=0.000). In inferior AMI, RCA was the most common IRA; however, the possibility of multi-vessel disease is increased when Cx is found to be the IRA. In patients presenting with inferior AMI, the presence of ST-depression in the leads aVL and V1-2 is a sensitive finding that indicates Cx stenosis rather than RCA stenosis and is not affected by coexisting other coronary artery involvements.     

心电图在诊断急性心肌梗死相关动脉中的价值

目的分析急性心肌梗死患者不同梗死部位心电图表现及梗死相关动脉的分布特点,评价心电图诊断梗死相关动脉的价值。方法对132例急性心肌梗死患者心电图和冠状动脉造影资料进行回顾性比较分析。结果心电图显示心肌梗死发生率以心脏下壁、前间壁和广泛前壁最高,分别为31例(23.5%)、26例(19.7%)和22例(16.7%);造影显示梗死相关动脉的发生率分别为左主干(LM)3例(2.3%)、前降支(LAD)73例(55.3%)、回旋支(LCX)18例(13.6%)、右冠状动脉(RCA)38例(28.8%);前壁心肌梗死(55例)的梗死相关动脉多为LAD(51例,92.7%),下壁心肌梗死(31例)的梗死相关动脉多为RCA(22例,71.0%)或LCX(7例,22.6%),且与冠状动脉优势类型密切相关,前壁梗死合并aVR、aVL导联ST段抬高对诊断LAD近段闭塞的特异性较高,分别为86.7%和90.0%。结论急性心肌梗死心电图表现与梗死相关动脉存在明显相关性,有较高的临床诊断价值。     

Electrocardiographic identification of the infarct-related artery in acute inferior myocardial infarction.

INTRODUCTION: Mortality and morbidity from acute inferior myocardial infarction (MI) are determined, among other factors, by the infarct-related artery (IRA). Several electrocardiographic (ECG) criteria have been proposed to differentiate between the right coronary artery (RCA) and the left circumflex coronary artery (LCx) as the IRA in inferior MI. Recently, a new criterion has been proposed (ST segment depression in lead aVR). It was our objective to evaluate the old and the new ECG criteria in identifying the IRA in patients with inferior MI. METHODS: Patients with inferior MI treated by primary angioplasty were included, following evaluation of the admission ECG. Patients with a previous history of Q-wave myocardial infarction and complete bundle branch block were excluded. The artery with the most severe lesion was considered the IRA. The following ECG criteria were assessed: ST depression in lead DI; ST depression in leads V1 and V2, ST elevation in lead DIII > DII, ST depression in V3/ST elevation in DIII ratio > 1.2 (classical criteria) and ST depression in lead aVR. ST-segment elevation or depression was measured 0.06 sec after the J point. RESULTS: 53 patients were included (mean age 59.1 +/- 13.9 years, 38 males). The RCA was the IRA in 38 patients and the LCx in 15. Baseline characteristics (age, gender, TIMI flow, Killip class, and pain-to-balloon time) were similar in both groups. All the classical criteria were able to identify the IRA. The new criterion--ST depression in lead aVR--identified the IRA in a small number of patients (sensitivity 33%, specificity 71%, p = NS). CONCLUSIONS: The 4 classical criteria were useful in identifying the IRA in patients with inferior MI. ST depression in lead aVR (a recently proposed new criterion), on the other hand, showed limited utility in differentiating between RCA and LCx.