体表心电图特征对特发性右心室流出道室性心动过速和室性早搏起源点的定位价值

目的 起源于右心室流出道(RVOT)不同位点的室性心动过速(VT)具有相应的心电图表现,本研究旨在摸索一种相对简单的根据体表心电图进行定位的方法 .方法 将RVOT分为游离壁和间隔而两大区,其中间隔面又分为9个区域.共320例RVOT-VT患者中,对213例既往消融成功患者的靶点与体表12导联心电图中QRS波形态之间的关系进行分析,并在消融前前瞻性地对另外107例患者的消融靶点进行预测,以检验其定位价值.结果 I导联对RVOT起源的VT有特殊的定位价值.在间隔面前部起源时,I导联以负向波为主,多为QS、Qr及rS型,随着起源点从前向后、从上向下,R波逐渐升高,其中起源于间隔侧中带(2、5、8区)时,以"M"型居多,在后壁时则表现为R波且有切迹.游离壁起源者的QRS时限明显延长,I和aVL导联的R波较间隔起源者高,而下壁导联的R波均较间隔的低(P<0.05).在前瞻性分析中,这些参数的敏感度、特异度、阳性和阴性预测值均较高.结论 RV-OT不同部位起源的VT有相应的心电图特征,其中I导联形态尤其具有定位价值,为RVOT心律失常起源提供了简便的定位标准.     

心电图Ⅰ导联m型QRS波形态在流出道室性心律失常中的诊断价值

目的探讨心电图Ⅰ导联QRS波形态呈m型在流出道室性心律失常(PVC)中的定位诊断价值。方法回顾性分析成功行射频消融的流出道PVC患者357例,根据消融成功的心腔分为两组:左室流出道(LVOT)消融成功者(A组,n=139),右室流出道(RVOT)消融成功者(B组,n=218),比较两组患者心电图Ⅰ导联QRS波呈m型的例数、Ⅰ导联QRS波的振幅、靶点位置及靶点图电位特点。结果 (1)A组患者9例Ⅰ导联QRS波形态呈m型,B组患者30例Ⅰ导联QRS波形态呈m型,发生率有显著差异(6.5%vs 13.8%,P0.05)。(2)两组患者Ⅰ导联QRS波振幅有显著差异[(0.38±0.13)mV vs(0.21±0.13)mV,P0.01];两组患者Ⅰ导联QRS波时程差异无显著性[(129.0±29.4)ms vs(145.6±26.0)ms,P0.05]。(3)A组消融成功靶点位置位于RCC前部,B组消融成功靶点位置位于RVOT左侧肺动脉瓣附近游离壁、间隔交界处的间隔侧,两者靶点解剖位置相距较近。(4)两组靶点图V波提前QRS波程度有显著差异[(31±12.3)ms vs(21±5.7)ms,P0.05]。结论流出道PVC的Ⅰ导联QRS波形态呈m型提示消融成功靶点位置在RCC前部,或RVOT左侧肺动脉瓣附近游离壁、间隔交界处的间隔侧,RVOT起源多于LVOT起源,且两者靶点解剖位置相距较近。     

右心室间隔部希氏束附近室性期前收缩心电图与射频消融

目的 报道右心室流入道间隔部希氏束附近起源室性期前收缩体表心电图特征及射频消融效果。方法 无器质性心脏病频发性室性期前收缩5例,分析其12导联体表心电图室性期前收缩特点;病人接受心内电生理检查,于右心室流入道行激动与起搏标测,以心室激动较体表QRS波提早、消融导管远端起搏图形与体表心电图室性期前收缩相似部位为消融靶点。结果 室性期前收缩QRS波形态：5例病人Ⅰ导联和Ⅱ导联QRS波均呈R型,Ⅲ导联、aVF导联以低振幅波为主,V1导联均呈QS型,胸导联较早转变成qR或R型（发生于V2或V3）,V5、V6均呈高R型;室性期前收缩QRS波时限为110～120ms。5例病人分别于前间隔（2例）、中间隔（1例）、后间隔（2例）标测到消融靶点,放电后前间隔部、后间隔部病人室性期前收缩均消失,中间隔病人消融失败。无房室传导阻滞并发症。随访8～30个月,成功病例未应用抗心律失常药物,无室性期前收缩发作。结论 右心室流入道间隔部希氏束附近起源室性期前收缩体表心电图具有明显的特征,认识这些特征有助于导管标测与射频消融,消融此部位室性期前收缩安全、有效。     

肺动脉窦起源的室性心律失常的电生理特点及射频消融治疗

目的研究肺动脉窦(PSC)标测与消融在射频消融治疗形似右室流出道(RVOT)起源的室性心律失常(VAs)中的价值。方法入选70例体表心电图表现为左束支传导阻滞、电轴向下的频发室性早搏/室性心动过速患者,经右股静脉进RVOT行电激动标测和起搏标测,证实为PSC或RVOT起源并进行射频消融治疗。分析其体表心电图特点、电生理检查特征及导管射频消融治疗结果。结果 PSC起源VAs在体表心电图形态表现上与RVOT起源者无明显差异,均表现为QRS形态呈左束支阻滞图形,下壁导联R波直立。各PSC起源VAs体表心电图表现略有差异。60例(86%)患者激动标测最早激动点在PSC内,且成功在PSC内消融。约93%的患者于PSC内获得较好的起搏标测结果。其余10例患者最终消融成功靶点位于肺动脉瓣下RVOT后间隔部6例,前间隔4例。PSC内靶点电位领先体表QRS波(26.2±2.5)ms,远大于RVOT处标测结果(20.2±2.4)ms。结论 PSC起源室性心律失常临床较常见。确定PSC内起源VAs约90%可在窦内消融成功。     

双源CT精确判断的室间隔起搏患者心电图变化特征

目的结合数字减影血管造影(DSA)图像以及双源CT精确判定室间隔起搏部位,分析体表心电图变化特征。方法 57例植入起搏器患者,术中经DSA图像定位提示起搏导线植入右室间隔部,术后行双源CT确定导线精确位置,分析明确植入到室间隔不同部位及游离壁的起搏心电图特征。结果游离壁12例(21.1%);间隔45例(78.9%)。游离壁起搏的QRS波时限显著宽于高位间隔起搏(150±15 ms vs 121±26 ms,P<0.05);高位间隔起搏Ⅲ导联R波振幅(RⅢ)明显大于低位间隔起搏(1.10±0.55 mV vs-0.27±0.12 mV,P<0.05);高位间隔起搏者44.4%Ⅰ导联出现q波或QS,中位间隔36.8%,低位和游离壁均为0;代表游离壁起搏的肢体导联切迹发生率没有明显差异。结论室间隔起搏心电图往往表现为窄QRS波,I导联形态多变,高位间隔起搏时RⅢ较高。     

右心室流出道主动固定电极和心尖部被动固定电极体表起搏心电图的研究

目的 观察右心室流出道主动固定电极和右心室心尖部被动电极体表起搏心电图的变化. 方法 比较右心室流出道主动固定电极(游离壁12例,间隔部16例)和右心室心尖部被动固定电极(20例)起搏心电图的QRS波群主波方向及时间,比较6个肢体导联上起搏和自主QRS波形态的相似性. 结果 QRS时间间隔部起搏(0.113±0.020)S较游离壁(0.135±0.027)S和右心室心尖部10.151±0.032)s起搏短,差异有显著性或非常显著性意义(P<0.05、0.01);后两者之间无显著性差异.6个肢体导联上,间隔部起搏QRS形态较接近自主QRS形态.间隔部起搏Ⅰ和aVL QRS波群主波向下的比例显著高于游离壁起搏(P<0.05).游离壁起搏ORS波群切迹比例显著高于间隔部起搏(P<0.05). 结论 右心室流出道间隔部起搏可以改善患者血流动力学.心电图特征性改变可指导起搏器起搏位置的选择.     

特发性室性心动过速激动起源部位分区的临床研究

应用体表心电图对特发性节性心动过速（IVT）激动起源点进行分区、定位研究。将心室分为4个区11个部位。Ⅰ区即左室间隔,高、小、低3个那位;Ⅱ区即右主流出道,上、中、下和前后6个部位;Ⅲ区即注定游离壁;Ⅳ区即右室游离壁。20例（除外器质性心脏病）室上性心动过速射频消融成功后,大头导管在分区内起搏并记录12导联起搏心电图,据其特点总结出IVT起源的诊断标准。再根据诊断标准对39例消融成功的IVT病例进行IVT起源判断。结果：右室流出道IVT根据Ⅰ导联QRS波群形态特点分前后,胸前导联R波移行部位分上下。右室游离壁IVT表现为完全性左来支阻滞图形、电轴左偏。左定IVT根据电轴左偏的程度判定IVT起源部位。体表心电图诊断标准除对起源于左室中位间隔IVT诊断的灵敏度（50％）较低外,其余部位诊断的灵敏度、特异度和符合率均较高（75％～100％）。提示体表心电图对IVT起源点的定位有较高的预测价值。     

左室不同部位起源室性心律失常的体表心电图特征分析

目的探讨左室起源室性心律失常基本心电图特征及左室不同部位起源室性心律失常的心电图特征。方法连续入选2005年3月至2014年10月大连医科大学附属第一医院收治的频发室性早搏(PVCs)和(或)室性心动过速(VT)并进行导管射频消融治疗成功的患者。所有患者均有临床PVCs/VT发作时的体表十二导联心电图,以术中消融治疗成功靶点作为室性心律失常的起源点,分析体表心电图QRS波群总体特征以及左室不同起源部位PVCs/VT的体表心电图各QRS波群形态特点。结果共纳入237例接受导管射频消融治疗成功的室性心律失常患者,其中78例起源于左室(78/237,32.9%)。左室起源的PVCs/VT在V_1导联绝大多数呈rsR′或R形(72%),呈右束支传导阻滞图形特点,少部分V_1呈rS或RS形(23.5%);胸导联R波移行多在V_3导联之前(73.5%),移行在V_3导联之后者少见(7.3%),移行在V_3导联者为19.1%。其中V_3导联移行指数常<0者占绝大多数(92.3%)。左室流出道主动脉瓣上(主动脉窦)与主动脉瓣下起源者下壁导联及V_5-V_6导联均呈高R形(87.5%);主动脉瓣上起源者特点为:V_1导联多有S波呈rS/RS或QS形(84.2%),V_1导联主波向下(84.2%)。主动脉瓣下起源者V_1导联多呈R/rsR′形(80%),无S波,V_1导联主波向上呈右束支阻滞图形(80%),主动脉瓣下起源者所有胸前导联均呈高R波(80%)。左纤维三角及二尖瓣环前壁起源者下壁导联呈高R形、V_5-V_6导联呈Rs形(100%),V_1导联呈R/rsR′形呈右束支阻滞图形(100%)。左前分支及左前乳头肌起源者下壁导联主波向上为100%(下壁导联至少有1个导联呈qR形),且Ⅰ、aVL导联100%呈rS/QS形、V_5-V_6导联呈Rs形(100%)。左后分支及左后乳头肌起源者下壁导联主波向下(100%呈rS/QS形),且Ⅰ、aVL导联100%呈qR形、V_5-V_6导联呈rS/RS形(85.2%)。心尖部起源者下壁导联主波方向向下且均呈rS/QS形、V_5-V_6导联呈QS形(100%),其中Ⅰ导联均呈QS形。结论根据体表心电图胸导联R波移行导联、V_3导联移行指数,可以明确PVCs/VT起源于左室;根据下壁导联、Ⅰ、aVL导联、V_1导联、V_5-V_6导联QRS波群特征,可初步判断PVCs/VT在左室的各起源部位。     

房室折返性心动过速伴间歇性右束支传导阻滞一例

患者男性,52岁,阵发性心悸1个月,心悸时心电图示心动过速伴宽窄QRS波交替出现,偶可见成串宽QRS波,宽QRS波呈完全性右束支阻滞。行心内电生理检查示左侧游离壁隐匿性旁道,诱发心动过速时及冠状窦电极起搏时可见完全性右束支传导阻滞,心电图形态与心悸时心电图一致。射频消融阻断旁道后心动过速不能再诱发。诊断为左侧旁道伴房室折返性心动过速合并间歇性右束支传导阻滞。     

起源于右室流出道和三尖瓣环交界区的室性早搏的心电图特点和消融治疗

目的报道起源于右室流出道和三尖瓣环交界区(RTJ)的室性早搏(简称室早)的心电图特点和射频消融疗效。方法回顾性分析右室消融成功的室早的心电图和腔内电生理特点。根据室早起源部位分为右室流出道(RVOT)组,三尖瓣环(TV)组,RVOT与TV之间的区域(RTJ)组。另选5例无室早的阵发性室上性心动过速患者作为对照组。结果 RVOT组有78例,TV组有11例,RTJ组有12例。RTJ组的室早心电图在Ⅰ、Ⅱ、Ⅲ和aVF导联均为单相R波,aVL导联均为低平波形,rsr′、qs、qr、rs或r型,平均振幅为(0.3±0.1)mV,而RVOT组的室早aVL导联为深倒的S波,平均振幅为(-0.7±0.4)mV;TV组的室早aVL导联为直立的R波,平均振幅为(0.8±0.3mV)(P<0.05)。应用激动标测和起搏标测能成功定位RTJ室早并成功消融。5例对照组患者RTJ起搏在aVL导联产生低平QRS波形。结论 RTJ起源的室早并不少见,心电图aVL导联低平是区别于RVOT或TV起源室早的显著特点。射频消融治疗安全有效。     

Electrocardiographic patterns of superior right ventricular outflow tract tachycardias: distinguishing septal and free-wall sites of origin

INTRODUCTION: The superior right ventricular outflow tract (RVOT) septum and free wall are common locations of origin for outflow tract ventricular tachycardias (VT). We hypothesized that (1) unique ECG morphologies of pace maps from septal and free-wall sites in the superior RVOT could be identified using magnetic electroanatomic mapping for accurate anatomical localization; and (2) this ECG information could help facilitate pace mapping and accurate VT localization. METHODS AND RESULTS: In 14 patients with structurally normal hearts who were undergoing ablation for outflow tract VT, a detailed magnetic electroanatomic map of RVOT was constructed in sinus rhythm, then pace mapping was performed from anterior, mid, and posterior sites along the septum and free wall of the superior RVOT. Pace maps were analyzed for ECG morphologies in limb leads and transition patterns in precordial leads. Monophasic R waves in inferior leads for septal sites were taller (1.7 +/- 0.4 mV vs 1.1 +/- 0.3 mV; P < 0.01) and narrower (158 +/- 21 msec vs 168 +/- 15 msec; P < 0.01) compared with free-wall sites; lacked "notching" (28.6% vs 95.2%; P < 0.05); and showed early precordial transition (by lead V4; 78.6% vs 4.8%; P < 0.05). A positive R wave in lead I also distinguished posterior from anterior septal and free-wall sites. Based on QRS morphology in limb leads and precordial transition pattern (early vs late), in a retrospective analysis, a blinded reviewer was able to accurately localize the site of origin of clinical arrhythmia (the successful ablation site on the magnetic electroanatomic map) in 25 of 28 patients (90%) with superior RVOT VT. CONCLUSION: Pace maps in the superior RVOT region manifest site-dependent ECG morphologies that can help in differentiating free-wall from septal locations and posterior from anterior locations. Despite overlap in QRS amplitude and duration, in the majority of patients a combination of ECG features can serve as a useful template in predicting accurately the site of origin of clinical arrhythmias arising from this region.     

心脏选择性部位起搏的电和机械同步性研究的初步报告

目的观察心脏不同部位起搏时的电及机械同步性和血流动力学变化。方法14例患者分别于右室心尖（RVA）、希氏束部位（His）、右室高位流出道间隔部（RVOT）起搏,记录心输出量和心脏指数;比较不同部位起搏和自身心律时12导联体表心电图的QRS波宽度和方向,以评价电同步性;用全数字化超声诊断系统的向量速度显像评价机械同步性。结果心输出量和心脏指数在RVA起搏时较差,但差异无统计学意义（P〉0．05）。各部位起搏时QRS波的宽度：His为（124±5．3）ms,RVOT（144±7．1）ms,RVA（156±8．6）ms,均较自身心律（92±4．5）ms时宽（P〈0．01）;而His及RVOT均较RVA起搏时的QRS波时限窄,其差异有统计学意义（P〈0．01）。向量速度显像检查提示,RVOT起搏相对于RVA起搏有更好的机械同步性。结论RVOT可能较传统的RVA部位起搏好,同时手术操作容易。     

Electrocardiographic predictors of validated right ventricular outflow tract septal pacing for correct localization of transthoracic echocardiography

Background

Electrocardiographic (ECG) characteristics of true right ventricular outflow tract (RVOT) septal pacing have not been clearly demonstrated.

Hypothesis

We hypothesized that ECG parameters would help operators differentiate true RVOT septum from non‐septal septum.

Methods

We analyzed 151 patients who underwent pacemaker implantation with a ventricular lead in the RVOT. Transthoracic echocardiographic (TTE) determination of pacing sites was applied in all patients after implantation. A 12‐lead ECG was recorded during forced ventricular pacing.

Results

According to TTE orientation, pacing at the RVOT septum was achieved in 94 patients (62.3%). Compared with nonseptal pacing, septal pacing had significantly shorter QRS duration (139.2 ± 18.5 ms vs 155.5 ± 14.7 ms; P < 0.001). More frequent negative or isoelectric QRS vector in lead I (76% vs 32%; P < 0.001), lead II/III R‐wave amplitude ratio < 1 (52% vs 25%; P = 0.001), and aVR/aVL QS‐wave amplitude ratio < 1 (59% vs 32%; P = 0.001) were observed in septal pacing. Transitional zone (TZ) score (3.8 ± 0.96 vs 4.2 ± 0.90; P = 0.004) and TZ index (0.3 ± 0.5 vs 0.6 ± 0.7; P = 0.008) were significantly lower in septal pacing than in nonseptal pacing, respectively. In multivariate analysis, paced QRS duration and negative or isoelectric QRS vector in lead I independently predicted RVOT septal pacing (P < 0.001). At ROC curve analysis, paced QRS duration ≤145 ms identified RVOT septal pacing with 85.1% sensitivity and 78.9% specificity.

Conclusions

This study reveals the heterogeneity of lead placement within the RVOT. Narrower paced QRS duration and negative or isoelectric QRS vector in lead I independently predict RVOT septal pacing.     

Ⅰ和aVF导联联合Ⅱ导联法与传统Ⅰ和Ⅲ导联法判断QRS平均心电轴的比较

目的 比较Ⅰ和aVF导联目测判断QRS平均心电轴与Ⅰ和Ⅲ导联判断电轴的优势.方法 采用整群抽样法抽取兰州大学第二临床医学院2015级临床医学生,分为研究组和对照组,研究组用导联Ⅰ和aVF判断电轴,对照组用导联Ⅰ和Ⅲ判断电轴.判断标准依据心电图机系统化数据为参考结果 .结果 应用导联Ⅰ和aVF判断其中3个象限的心电轴快速...     

Electrocardiographic characteristics of repetitive monomorphic right ventricular tachycardia originating near the His-bundle

INTRODUCTION: Most idiopathic nonreentrant ventricular tachycardia (VT) and ventricular premature contractions (VPCs) arise from the right or left ventricular outflow tract (OT). However, some right ventricular (RV) VT/VPCs originate near the His-bundle region. The aim of this study was to investigate ECG characteristics of VT/VPCs originating near the His-bundle in comparison with right ventricular outflow tract (RVOT)-VT/VPCs. METHODS AND RESULTS: Ninety RV-VT/VPC patients underwent catheter mapping and radiofrequency ablation. ECG variables were compared between VT/VPCs originating from the RVOT and near the His-bundle. Ten patients had foci near the His-bundle (HIS group), with the His-bundle local ventricular electrogram preceding the QRS onset by 15-35 msec (mean: 22 msec) and His-bundle pacing produced a nearly identical ECG to clinical VT/VPCs. The HIS group R wave amplitude in the inferior leads (lead III: 1.0 +/- 0.6 mV) was significantly lower than that of the RVOT group (1.7 +/- 0.4 mV, P < 0.05). An R wave in aVL was present in 6 of 10 HIS group patients, while almost all RVOT group patients had a QS pattern in aVL. Lead I in HIS group exhibited significantly taller R wave amplitudes than RVOT group. HIS group QRS duration in the inferior leads was shorter than that of the RVOT group. Eight of 10 HIS group patients exhibited a QS pattern in lead V1 compared to 14 of 81 RVOT group patients. HIS group had larger R wave amplitudes in leads V5 and V6 than RVOT group. CONCLUSION: VT/VPCs originating near the His-bundle have distinctive ECG characteristics. Knowledge of the characteristic QRS morphology may facilitate catheter mapping and successful ablation.     

三维超声评价起搏心电图对右心室流出道起搏电极导线的定位作用

目的 根据三维超声心动图精确定位的起搏心电图特点来评价起搏电极导线位于右心室流出道的位置.方法 40例植入永久性起搏器的患者,植入术中经二维X线影像定位示心室起搏电极导线位于右心室流出道高位间隔部,植入术后行心脏三维超声心动图检查以评价心室电极导线位于右心室流出道的精确位置,并分析起搏电极导线位于不同部位的体表起搏心电图特点.结果 三维超声心动图示起搏电极导线位于高位间隔者23例(57.5%),低位间隔者6例(15.0%),游离壁者11例(27.5%).与游离壁相比,起搏电极导线位于高位间隔时,其下壁导联起搏心电图的R波振幅高[(1.28±0.18)mV vs(0.88±0.18)mV,P＜0.001]、QRS时限短[(132.5±8.3)ms vs(155.3±6.9)ms,P＜0.001]、顿挫少(21.7% vs 90.9%,P＜0.001),胸前导联R/S移行早(大于V4,24%vs 81%,P＜0.05);起搏电极导线位于低位间隔时,其R波振幅也较高[(1.43±0.13)mV vs(0.88±0.18)mV,P＜0.001]、时限也较短[(143.5±4.3)ms vs(155.3±6.9)ms,P=0.004],胸前导联R/S移行早(大于V4,24%vs 81%,P＜0.05).而高位间隔与低位间隔相比,高位间隔QRS波时限更短[(132.5±8.3)ms vs(143.5±4.3)瑚,P=0.003].另外,当起搏电极导线位于后间隔时,Ⅰ导联上的QRS波以正向波为主,位于前间隔时则以负向波为主.结论 三维超声心动图有利于心室起搏电极导线在右心室流出道的精确定位;不同部位起搏的心电图具有不同的特点,这些特点有利于植入术中起搏电极导线在右心室流出道的定位,当起搏电极导线位于后间隔时,其起搏心电图Ⅰ导联为正向波,前间隔时为负向波.     

镜像右位心的F导联心电图特征读析

目的 探讨F导联心电图诊断镜像右位心的特征。方法 在健康体检中应用F导联采集镜像右位心心电图并解读。结果 F导联检测到13例(0.018%)镜像右位心。在镜像右位心中Ⅰ导联各波形态均倒置,即P、QRS及T波均倒置;F2(Ⅱ)与F6(Ⅲ)导联、F3(aVR)与F1(aVL)导联波形互换;V3R、V5R导联波形类似正常时的V3、V5导联,代表左室波形;V1和V2导联代表右室波形。结论 镜像右位心的特征显示:P波F1(aVL)、F2(Ⅰ)导联显示镜像QRS波形;F1(aVL)、F2(Ⅰ)、F3(-aVR)、F4(Ⅱ)导联P-QRS-T波群均主波向下,呈rS型,其R波波幅递增;QRS波F5(aVF)不变;胸导联V1～V6呈rS型,其R波波幅递减,其S波呈逐渐相对增深,R/S比例逐渐减小的规律;V1导联R波高尖;常伴有其他心电图改变。     

ST-T改变在鉴别窄QRS波心动过速中的价值

为评价ST T改变在鉴别窄QRS波心动过速中的价值 ,用SPSS分析 12 4例窄QRS波心动过速患者体表 12导联心电图的ST T改变 ,其中房室折返性心动过速 (AVRT) 72例 ,房室结折返性心动过速 (AVNRT) 5 2例。结果 :AVRT组Ⅰ aVL导联ST段压低幅度 (0 .10± 0 .0 7mV)大于AVNRT组 (0 .0 6± 0 .0 6mV) ,P =0 .0 0 2 ;AVRT组V1导联T波幅度 (0 .14± 0 .19mV)大于AVNRT组 (0 .0 1± 0 .13mV) ,P <0 .0 0 1。鉴别窄QRS波心动过速的预测指标为QRS波终末改变 (R2 =0 .6 0 4 ,P <0 .0 0 1)、V1导联T波方向 (R2 =0 .2 4 9,P <0 .0 0 1)、V1导联T波幅度 (R2 =0 .180 ,P <0 .0 0 1)、Ⅰ aVL导联ST段压低 (R2 =0 .0 4 3,P <0 .0 0 1)。QRS波终末改变阳性预测AVNRT的特异性 98.6 % ,敏感性 75 .0 % ;V1导联T波正向预测AVRT的特异性 6 7.3% ,敏感性 81.9%。结论 :ST T改变有助于鉴别窄QRS波心动过速。QRS波终末改变是鉴别窄QRS波心动过速的较强预测指标 ;V1导联T波方向与幅度、Ⅰ aVL导联ST段压低是鉴别窄QRS波心动过速的较弱预测指标。