缺血性J波预测急性心肌梗死后恶性室性心律失常发生的价值

目的分析急性心肌梗死心电图中缺血性J波与恶性室性心律失常的关系,评价缺血性J波预测急性心肌梗死后发生恶性室性心律失常的临床价值。方法将96例ST段抬高型急性心肌梗死患者按梗死后心电图检查是否记录到缺血性J波分为J波组37例与非J波组59例,比较2组急性心肌梗死部位及梗死后发生恶性室性心律失常的情况。结果 J波组2个及以上部位心肌梗死发生率显著高于非J波组(51.3%比8.5%,χ2=10.978,P=0.027),且恶性室性心律失常发生率也显著高于非J波组(48.6%比6.8%,χ2=13.069,P=0.011)。结论心电图缺血性J波可作为急性心肌梗死发生恶性室性心律失常的预警指标,且可提示心肌梗死范围较大。 更多还原     

QT离散度对急性心肌梗死早期室性心律失常的预测

目的：为了评估ＱＴ离散度对急性心肌梗死（ＡＭＩ）早期室性心律失常发生的预测价值。方法：用回顾性单盲法分析３８例ＡＭＩ发病２４ｈ内首次心电图的未校正的ＱＴ离散度（ＱＴｄ）、心率校正ＱＴ离散度（ＱＴｃｄ）。结果：二种方法所测得的ＱＴ离散度在心律失常组与无心律失常组间差异分别均具显著性，且各种离散度以≥６０ｍｓ为标准对预测发病１周内发生室性心律失常的敏感度分别为７９２％和８２５％，Ｐ＞００５。结论：各种ＱＴ离散度≥６０ｍｓ可作为预示ＡＭＩ早期室性心律失常发生，具有重要临床应用价值。     

急性心肌梗死患者QT离散度与室性心律失常的关系

目的探讨急性心肌梗死(AMI)患者QT间期离散度(QTd)与室性心律失常的关系。方法测量42例AMI患者心电图的QTd,对有室性心律失常组与无室性心律失常组进行比较。结果AMI有室性心律失常组的QTd高于无室性心律失常组的QTd。结论AMI患者发生室性心律失常与QTd增大有关。     

QTd增加对急性心肌梗死室性心律失常的影响

观察 76例急性心肌梗死 (AMI)患者早期心电图QT离散度 (QTd)的变化 ,以探讨AMI患者QTd与室性心律失常的关系。结果AMI患者QTd值越大 ,室性心律失常发生率越高 ,故QTd可作为预测AMI恶性室性心律失常的一项重要指标。     

QT离散度对急性心肌梗死早期室性心律失常的预测

为了评估ＱＴ离散度对急性心肌梗死早期完整无缺人常发生的预测价值。方法：用回性单盲法分析３８例ＡＭＩ发病２４ｈ内首次心电图的未校正的ＱＴ离散度、心率校正ＱＴ离散度。结果：二种方法所测量物ＱＴ离散度在心律失常与无心律失常组间差异分别均具显著性。     

缺血性J波预测ST段抬高心肌梗死恶性室性心律失常的临床分析

目的探讨缺血性J波对急性ST段抬高心肌梗死(STEMI)发生恶性室性心律失常的预测价值。方法选择我院2005年6月至2010年7月收治的286例急性STEMI患者,以入院时体表心电图记录到缺血性J波的41例为观察组,未记录到缺血性J波的245例为对照组。比较2组患者入院48h、住院期间恶性室性心律失常发生率及2组发生恶性室性心律失常患者的QT、及QT离散度(QTd)、T波峰-末间期(Tp-Te)。结果观察组患者入院48h、住院期间恶性室性心律失常发生率明显高于对照组(P<0.05);观察组QTd、Tp-Te较对照组明显延长(P均<0.01),2组QT无明显差异(P>0.05);观察组中发生恶性室性心律失常患者的QTd、Tp-Te较同组无恶性室性心律失常患者明显延长(P均<0.01)。结论缺血性J波出现于急性STEMI患者时,恶性室性心律失常发生率增加,可作为急性STEMI患者发生恶性室性心律失常的预测指标,如结合QTd、Tp-Te能进一步提高预测能力。     

急性心肌梗死早期QTd与恶性室性心律失常的关系

急性心肌梗死（AMI）发生心脏猝死的原因主要是心室颤动（Vf）。目前许多学研究认为QTd（QT间期离散度）延长与发生致命性心律失常一室性心动过速（VT）和Vf有关。本对64例AMI发病24h内首次心电图QTd进行测定分析，以探讨对AMI预后的意义。现将结果报告如下。     

急性心肌梗死早期室性心律失常发生与QT离散度的关系分析

目的：观察急性心肌梗死（AMI）早期QT离散度与室性心律失常发生的关系。方法：观察分析81例AMI患者QTd,QTcd睾室性世箜失常竺苎至磊况：并写对照组比较。结果：AMI组的QTa、QTcd均较对照组延长，室性心律失常发生率增加（P〈0.01）差异有显著性。结论：AMI早期QT离散度增加与室性心律失常发生有密切关系，可以作为预测AMI后恶性室性心律失常发生的重要指标。     

急性心肌梗死早期QT离散度与室性心律失常发生的关系分析

有研究认为QT离散度(QTd、QTcd)与心律失常的发生有密切关系，本研究观察急性心肌梗死早期二者的关系，以探讨二者的相关性。     

Tp-e/QT比值对急性非ST段抬高型心肌梗死室性心律失常的预测价值

目的:探讨Tp-e/QT比值对急性非ST段抬高型心肌梗死(NSTEMI)室性心律失常的预测价值。方法:选取60例NSTEMI患者为观察组,同期60例健康志愿者为对照组,比较两组Tp-e/QT比值。结果:观察组入院时Tp-e/QT比值显著高于对照组(P0.05),观察组中发生室性心律失常患者的Tp-e/QT比值较无室性心律失常者明显延长,Tp-e/QT比值与室性心律失常的发生呈显著相关(P0.05),且Tp-e/QT比值降幅与急性ST段下降程度呈显著正相关(P0.05)。结论:Tp-e/QT比值与NSTEMI患者室性心律失常的发生显著相关,在一定程度上能预示NSTEMI室性心律失常的发生。     

急性心肌梗塞早期QT离散度分析

本文回顾分析了60例急性心肌梗塞（AMI）患者,患者在发病24 h内就诊,并描记首次心电图,分为有严重室性心律失常组和无室性心律失常组。发现两组QT离散度（QTd）和心率校正的QT离散度,（QTcd）均有显著的差异。而不同部位的急性心肌梗塞分组比较QTd和QTcd未显示明显的差异。     

急性心肌梗塞时QT间期离散度对心室颤动的影响

目的:探讨急性心肌梗塞(AMI)时心电图QT间期离散度的改变与心室颤动之间的关系。方法:回顾性分析25例AMI后24小时内发生心室颤动的患者(心室颤动组)和32例未发生心室颤动的AMI患者(对照组),对比分析两组急诊时体表同步12导心电图的QT间期离散度和QTc间期离散度。结果:心室颤动组QTc间期离散度和QT间期离散度均显著高于对照组(分别为76ms±15ms与33ms±16ms和73ms±21ms与40ms±14ms,P<0.001)。结论:AMI时QT间期离散度增加可导致心室颤动的危险性增加。     

QT Dispersion Does Not Predict Early Ventricular Fibrillation After Acute Myocardial Infarction

Ventricular arrhythmias may be associated with increased QT dispersion (difference between maximum and minimum QT on standard 12-lead ECG). We performed a case control study to determine if QT dispersion on the admission ECG could predict early VF after acute myocardial infarction. The cases were 24 patients with acute myocardial infarction (14 inferior, 8 anterior, and 2 lateral) with VF within 12 hours of admission. There were 24 control patients without VF matched for site of infarction and ST segment score (sum of ST segment elevation). VF occurred a median of 153 minutes (interquartile range 93–245) after onset of chest pain and 33 minutes (range 7–104) after initial ECG. QT (399 ± 37 and 394 ± 37), QT corrected (440 ± 38 and 429 ± 29), and QT dispersion (68± 20 and 66 ± 27) were similar in patients and controls. By design, ST score was similar (11 ± 9 vs 9 ± 5 mV), although a good match could not be obtained for three patients with extreme ST elevation. Patients with VF presented to the hospital earlier after the onset of chest pain (median 95 min [range 65–188] compared to 150 min [range 80–270], P= 0.05) and had a lower serum sodium (138 ± 2.4 vs 140 ± 2.5, P = 0.05) than controls. Thus, QT interval and QT dispersion, measured on the presenting ECG, did not predict early VF after myocardial infarction.     

QT离散度及心室晚电位对心肌梗塞急性期室性心律失常的预测价值

目的：研究QT离菜度（QTd)及心室晚电位（VLP）对心肌梗塞急性期室性心律失常的预测价值。方法：计算48例急性心肌梗塞患QTd,其中34例行VLP检测。结果：12例严重室性心律失常组QTd,校正的QT离散度（QTcd)明显延长,VLP阳性率明显高于无室性心律失常组（P＜0．01）,结论：QTd和VLP检测对心肌梗塞急性期发生室性心律失常有较高预测价值。     

急性心肌梗死患者溶栓前后QT离散度的变化

目的:观察急性心肌梗死(AMI)患者溶栓前后QT离散度(QTdispersion,QTd)的变化及早期再灌注对QTd的影响。方法:对61例AMI患者给予尿激酶静脉溶栓治疗,予溶栓前及溶栓2h后同步记录18导联心电图,分别测量成功组及失败组的QTd,并进行前后比较。结果:溶栓后再通41例,溶栓后未通20例。血管未通组其QTd较前减少,但无统计学意义(P>0.05),溶栓后再通组其QTd较血管未通组降低程度更大,有统计学意义(P<0.01)。结论:QTd可作为评价AMI患者溶栓后判断溶栓成功与否的一项临床早期参考指标。     

急性心肌梗死早期患者排便过程中心脏自律性的变化

目的探讨急性心肌梗死(acute myocardial infarction,AMI)早期患者排便过程不同时段心脏自律性的变化特点,为临床对AMI早期患者采取有效的护理措施减少排便并发症的发生提供依据。方法采用动态心电图仪连续记录23例AMI早期患者25例次排便过程中的十二导联心电图,观察并比较AMI早期患者排便过程中不同时段心率变异性(heart rate variability,HRV)、QT离散度等指标的变化。结果AMI早期患者排便过程的不同时段中,HRV变化无统计学差异;但校正后QT离散度在排便过程中升高明显(P<0.05)。结论排便对AMI早期患者心脏自律性负性影响较大,尤以便中前期和便后整理时最为明显;护理人员应加强排便过程中的心脏功能监护,缩短患者排便时间,积极协助患者做好便后整理工作。     

急性心肌梗死早期患者排便过程中心脏自律性的变化

目的 探讨急性心肌梗死（acute myocardial infarction，AMI）早期患者排便过程不同时段心脏自律性的变化特点，为临床对AMI早期患者采取有效的护理措施减少排便并发症的发生提供依据。方法 采用动态心电图仪连续记录23例AMI早期患者25例次排便过程中的十二导联心电图，观察并比较AMI早期患者排便过程中不同时段心率变异性（heart rate variability，HRV）、QT离散度等指标的变化。结果 AMI早期患者排便过程的不同时段中，HRV变化无统计学差异；但校正后QT离散度在排便过程中升高明显（P〈0．05）。结论 排便对AMI早期患者心脏自律性负性影响较大，尤以便中前期和便后整理时最为明显；护理人员应加强排便过程中的心脏功能监护，缩短患者排便时间，积极协助患者做好便后整理工作。     

Does Atrial Fibrillation Beget Ventricular Fibrillation in Patients with Acute Myocardial Infarction?

Background: Atrial fibrillation (AF) is associated with increased mortality and a higher complication rate postmyocardial infarction (MI), but the exact mechanisms are unknown. We investigated whether AF predisposes to ventricular arrhythmia in postmyocardial infarct patients, thereby accounting for increased mortality. Methods: Five hundred consecutive patients admitted to our coronary care unit with acute MI were monitored for in‐hospital arrhythmias. Detailed information was also compiled on past history, co‐morbidities, electrolyte disturbances, drug therapies, and ejection fraction. Mortality data were collected for an average of 5.5 years. Results: The results have shown that the incidence of ventricular fibrillation (VF) is much greater in patients presenting with AF (P = 0.03) and multivariate analysis has shown that AF is independently associated with the development of VF. This association occurs principally in patients who are admitted with AF (P = 0.01) rather than those who develop it during their admission, although these patients are also at mildly increased risk. The increased incidence of VF does account for increased mortality in the AF patients but does not explain all of their excess risk. There was no association between AF and ventricular tachycardia (VT); P = 0.50. Conclusions: In conclusion, AF on admission to the hospital with acute MI is associated with an increased risk of VF and subsequent mortality.     

The Electrocardiographic Diagnosis of Acute Myocardial Infarction in Patients with Ventricular Paced Rhythms

Use of the ECG for diagnosis of ischemic heart disease is more difficult in the setting of ventricular paced rhythms (VPRs). ST-segment/T-wave configurations are changed by the altered intraventricular conduction associated with ventricular pacing. The anticipated, or expected, morphology in patients with VPRs is one of QRS-complex-ST-segment to T-wave discordance. Several strategies are available to the physician to assist in the correct interpretation of the 12-lead ECG in patients with permanent ventricular pacemakers, including: a knowledge of the anticipated ST-segment-T-wave changes of VPRs and consequently the ability to recognize acute, ischemic morphologies; the performance of serial ECGs or ST-segment trend monitoring demonstrating dynamic changes encountered in acutely ischemic patients; a comparison with previous ECGs; and, if appropriate, an analysis of the native, underlying rhythm. The first strategy, an awareness of the anticipated ST-segment morphologies of VPRs, is the most important and not dependent on additional diagnostic testing, past medical records, or additional expertise in pacemaker function. Two cases are reported in which an analysis of the ECG in the setting of VPR assisted the treating physicians in establishing the correct diagnosis of acute myocardial infarction.