平板运动试验Duke评分对冠心病危险分层

目的:评价平板运动试验Duke评分(DTS)对冠心病危险分层的实用性。方法:选择151例胸痛患者行心电图平板运动试验(ETT)和冠状动脉造影检查,按DTS分为DTS中危组(DTS-10～+4,n=65)和DTS高危组(DTS≤-11,n=86),将其结果进行对照分析。用交叉表卡方检验的方法分析Duke评分预测有意义(至少1支≥50狭窄)和重度(3支或左主干)冠状动脉病变的价值。结果:在DTS高危组中ST段偏移、ST/HR-index、限制性心绞痛例数和年平均病死率均明显高于DTS中危组;而无心绞痛例数、运动时间和运动负荷量明显低于DTS中危组(P均<0.001),差异均有统计学意义。随冠状动脉病变严重程度的加重DTS高危组病例数显著增多,冠状动脉造影阳性有意义病变(至少1支≥50狭窄)者DTS中危组44例(67.7),DTS高危组80例(93.0);重度病变(3支或左主干狭窄)DTS中危组9例(13.8),DTS高危组39例(45.3)。年平均病死率DTS中危组为(2.9±1.1)、DTS高危组为(6.8±1.6),两组相比差异均有统计学意义(P均<0.001)。结论:DTS不仅提供准确的预后数据,而且能预测...     

无创平板运动试验评分与冠状动脉造影预后指标的相关性

目的 探讨冠心病患者无创平板运动试验Duke评分（DTS）与冠状动脉造影评价预后的指标校正的TIMI帧数（CTFC）之间的相关性,为利用无创的平板运动试验评价冠心病患者的预后提供依据。 方法 对冠状动脉造影确诊为冠心病,并在造影前2周内完成平板运动试验的患者61例进行回顾性分析。根据DTS进行分组(≥5分为低危组、<5分为中高危组),分析DTS与CTFC的相关性,比较不同危险组间CTFC的差异。结果 DTS与冠心病患者冠状动脉前降支（LAD）、回旋支（LCX）、右冠状动脉（RCA）的CTFC均呈负相关（r=-0.834、-0.769、-0.698,均P<0.01)。DTS低危组3支冠状动脉的CTFC值明显小于中高危组,组间CTFC值有明显差异\[LAD:(21.3±1.7)帧 vs (24.1±2.2)帧;LCX:(26.9±2.6)帧 vs (30.6±3.4)帧;RCA:(21.1±4.0)帧 vs (25.1±4.3)帧,均P<0.01\]。结论 冠心病患者平板运动试验Duke评分与LAD、LCX、RCA的CTFC值呈负相关。根据DTS得出的危险分层与CTFC有良好的相关性。     

平板运动试验对左前降支单支病变部位的预测价值

目的 探讨平板运动试验对左前降支（LAD）单支病变部位的预测价值.方法 选取2008年1月至2013年7月平板运动试验阳性,且冠状动脉造影为LAD单支病变患者64例,根据病变部位分成两组,LAD近端病变组34例,LAD中远端病变组30例,回顾性对比分析平板运动试验与LAD病变部位的关系.结果 LAD近端组的aVR导联抬高幅度明显高于LAD中远端组（P＜0.01）,伴胸闷、胸痛例数LAD近端组明显多于LAD中远端组（P＜0.05）,Duke评分LAD近端组明显低于LAD中远端组（P＜0.05）.运动时间、ST段改变开始时间、累积ST段下移幅度、达到目标心率的比率两组比较差异无统计学意义（P＞0.05）.LAD近端病变组出现aVR导联ST段抬高≥0.10 mV患者例数明显多于LAD中远端病变组（64.7％比20.0％,P=0.000）.aVR导联ST段抬高≥0.10 mV预测LAD近端病变的敏感度为64.71％、特异度为80.00％、阳性预测值78.57％、阴性预测值66.67％、准确率为71.88％.结论 平板运动试验诱发aVR导联ST段抬高对早期预测LAD近端病变有重要价值.     

64层螺旋CT冠状动脉成像对冠心病诊断的应用价值

目的 通过探讨64层螺旋CT冠状动脉成像(64-SCTCA)对冠心病诊断的应用价值以明确临床上适于该项检查的人群.方法 回顾性分析285例接受64-SCTCA检查、并于4周内接受冠状动脉造影(CAG)检查的冠心病疑诊患者的临床资料.依照冠心病概率Duke模型,将受检者分为冠心病低危(n=80)、中危(n=92)和高危(n=113)3组,以CAG为"金标准",判断64-SCTCA诊断冠心病的准确性以及冠状动脉钙化、不同部位血管节段等因素对诊断准确性的影响.结果 64-SCTCA诊断冠心病的敏感性、特异性、阳性预测值、阴性预测值和诊断准确指\数分别为81.2%、93.3%、68.0%、96.6%和74.5%.冠心病概率Duke模型的低危组、中危组和高危组,其冠心病检出率分别为46.3%、72.8%和82.3%;64-SCTCA在低危组诊断冠心病的敏感性及阳性预测值明显低于中危组和高危组.对于冠状动脉Agatston钙化积分＞400分组,64-SCTCA诊断冠心病的敏感性(95.0%)明显高于0～100分组和101～400分组(77.4%和77.3%,P均＜0.05),特异性(82.2%)明显低于上述两组(94.0%和95.3%,P均＜0.05).其诊断远端血管病变的敏感性、阳性预测值均明显低于近、中段血管(P均＜0.05).结论 64-SCTCA主要适用于冠心病概率Duke模型临床分层的中危人群.其诊断准确性受冠状动脉钙化、病变部位、管腔直径等因素影响.     

急性冠脉综合征与脂蛋白相关磷脂酶A2的相关性

目的 探讨急性冠脉综合征患者血清脂蛋白相关磷脂酶A2（Lp-PLA2）的水平及其对预后的临床价值.方法 入选急性冠脉综合征（ACS）患者112例,分为不稳定型心绞痛（UA）组、急性心肌梗死（AMI）组和非ST段抬高型心肌梗死（NSTEMI）组,其中UA组根据危险度分层分为低危、中危和高危组;对照组78例.所有患者均行冠状动脉造影检查,采用Gensini积分方法对各支冠状动脉病变程度进行评定,用ELISA方法测定各组Lp-PLA2水平,进行对比分析.结果 ACS各组患者血清Lp-PLA2水平均显著高于对照组（P＜0.01）;AMI组Lp-PLA2水平显著高于UA组（P＜0.01）;高危、中危组Lp-PLA2水平均高于低危组（P＜0.01,P＜0.05）,且三组相对应的冠脉评分也随着危险度的升高而增加（P＜0.01）.结论 Lp-PLA2水平可作为预测ACS病情严重程度及预后的重要生化指标之一.     

冠心病患者糖化血红蛋白水平与冠脉SYNTAX评分的相关性

目的：探讨冠心病患者糖化血红蛋白水平与冠脉病变严重程度的相关性。方法：选择心内科住院并行冠状动脉造影检查的515例患者资料进行分析,按照冠脉造影结果分为冠心病组（370例）和冠脉造影结果正常组（145例）;冠心病组患者再按糖化血红蛋白水平分为HbA1 c＜7％组（282例）和 HbA1 c≥7％组（88例）,按SYNTAX评分分为SYNTAX评分低危组（1-22分,181例）、中危组（23-32分,125例）及高危组（≥33分,64例）三个亚组,分析比较各组间糖化血红蛋白水平的差异。结果：HbA1 c≥7％组冠心病患者的冠脉SYNTAX 评分显著高于HbA1 c＜7％组[（25.6±9.97）分比（20.92±10.26）分, P＜0.01]。SYNTAX评分高危组和中危组HbA1c水平显著高于冠脉造影正常组、低危组[（8.74±0.83）分、（7.74±0.62）分比（5.12±0.49）分比（5.68±0.59）分],且低危组也显著高于正常组（P均＜0.01）。Pearson相关分析显示 HbA1c水平与SYNTAX评分呈正相关（r＝0.764,P＜0.01）。结论：糖化血红蛋白水平与冠脉病变严重程度呈正相关,SYNTAX评分高者糖化血红蛋白水平明显高于SYNTAX评分低者。     

单核细胞/高密度脂蛋白胆固醇比值与冠心病SYN-TAX积分的关系

目的探讨冠状动脉粥样硬化性心脏病(冠心病)患者单核细胞/高密度脂蛋白胆固醇(high-density lipo-protein cholesterol,HDL-C)比率(monocyte to HDL-C ratio,MHR)的变化与冠状动脉病变SYNTAX评分的相关性。方法选择2015年1月至2016年12月青海省人民医院疑诊断冠心病并住院行冠状动脉造影(CAG)检查的患者324例为研究对象。根据SYNTAX评分进一步分为低危组(n=134)、中危组(n=105)和高危组(n=85)。收集患者的一般资料及实验室检查结果,包括空腹血糖、心肌酶、血常规、肝及肾功能、血脂等。结果高危组的MHR高于低危、中危组,中危组MHR高于低危组,差异有统计学意义(P0.05)。MHR随SYNTAX评分的增高逐渐递增,与SYNTAX评分呈正相关(r=0.684,P0.05)。结论 MHR与冠状动脉病变程度呈正相关,可用于评价冠状动脉病变严重程度。     

NSTE-ACS患者GRACE评分和NLR与冠状动脉病变的关系

目的 研究非ST段抬高型急性冠脉综合征（NSTE-ACS）患者全球急性冠状动脉事件注册（GRACE）危险评分、中性粒细胞/淋巴细胞比值（NLR）与冠状动脉病变程度的相关性。 方法 回顾性分析228例在我院住院并行冠脉造影的NSTE-ACS患者。根据GRACE评分将患者分为低危组、中危组及高危组。采用Gensini积分量化冠脉病变程度,按Gensini积分三分位间距将患者分为轻度、中度及重度病变组。分析GRACE评分、NLR与是否与不同程度的冠状动脉病变相关。 结果 ①GRACE危险分层中危组及高危组NLR及Gensini积分较低危组升高（P<0.01）,3支及左主干病变发生率高于低危组（P<0.01）。冠脉重度病变组GRACE危险评分、NLR均高于轻度病变组（P<0.01）。②GRACE危险评分及NLR与Gensini积分呈正相关关系。GRACE危险评分联合NLR对重度冠脉病变有中等预测价值（ROC曲线下面积 0.725,95%CI 0.653~0.798,P<0.01）。 结论 GRACE危险评分、NLR与NSTE-ACS患者冠状动脉病变有良好相关性,可作为严重冠状动脉病变早期预测因子。     

非ST段抬高急性冠脉综合征患者心率震荡的变化

目的 探讨非ST段抬高急性冠脉综合征（NSTE-ACS）患者的GRACE评分、冠脉病变程度与心率震荡各指标之间的关系.方法 选择NSTE-ACS患者64例,定为NSTE-ACS组;同时选取71名健康者作为对照组.将NSTE-ACS组根据GRACE评分系统分为极高危组（24例）、高危组（21例）和低危组（19例）;根据冠状动脉病变累及范围分为左主干病变组（7例）、单支血管病变组（26例）、双支血管病变组（21例）和三支血管病变组（10例）;将冠脉造影结果按SYNTAX评分,分为高积分组（9例）、中积分组（25例）和低积分组（30例）.所有入选者行24h动态心电图检查,计算震荡初始值（TO）和震荡斜率（TS）,进行统计分析.结果 ①NSTE-ACS组TO明显高于对照组,TS明显低于对照组,两值比较差异均有统计学意义（P＜0.01）.②NSTE-ACS组中GRACE评分极高危组、高危组、低危组各组TO、TS值比较差异均有统计学意义（P＜0.01）.③单支病变组、双支病变组及左主干病变组TO值比较差异无统计学意义;三支病变组TO值明显升高,差异有统计学意义（P＜0.05）.TS值各组间比较差异均有统计学意义（P＜0.05）.④SYNTAX评分高积分组、中积分组、低积分组各组TO、TS值比较差异均有统计学意义（P＜0.05）.结论 NSTE-ACS患者心率震荡减弱;GRACE评分越高,心率震荡减弱越严重;心率震荡与冠状动脉病变程度明显相关,冠状动脉病变累及支数越多,SYNTAX评分越高,心率震荡减弱越严重.     

急性非ST段抬高型心肌梗死患者血浆N末端脑钠尿肽前体水平与全球急性冠状动脉事件注册评分的相关性研究

目的：探讨急性非ST段抬高型心肌梗死（ ANSTEMI）患者血浆N末端脑钠尿肽前体（ NT－proBNP）水平与全球急性冠状动脉事件注册（ GRACE）评分的关系。方法2010年1月—2013年10月连续入选在宁德市医院心内科住院治疗的初发ANSTEMI患者156例,根据入院时GRACE危险分层将患者分为低危组（ GRACE评分＜85分）48例、中危组（ GRACE评分为85～133分）51例、高危组（ GRACE评分＞133分）57例。采用德国SIEMENS公司生产的Dimension自动检测仪测定患者血浆NT－proBNP水平,分析血浆NT－proBNP水平与GRACE评分间的相关性。结果低危组患者血浆NT－proBNP中位水平为439（134～915） ng／L,中危组患者血浆NT－proBNP中位水平为886（234～2488） ng／L,高危组患者血浆NT－proBNP中位水平为2320（278～10442） ng／L,高危组患者血浆NT－proBNP水平＞中危组＞低危组（ P ＜0.05）。 NT－proBNP取以10为底的对数（ lg ）转换为lgNT－proBNP后与GRACE评分做双变量相关分析,结果显示lgNT－proBNP与 GRACE 评分呈正相关（ r ＝0.52, P ＜0.05）。结论ANSTEMI患者血浆NT－proBNP与GRACE评分呈正相关,检测血浆NT－proBNP水平有助于快速筛查高危ANSTEMI患者及评估其预后。     

平板运动试验评分与冠状动脉病变的关系

目的探讨平板运动试验评分即Duke评分(DTS)与冠状动脉病变严重程度之间的相关性。方法分析219例在同期内先后接受平板运动试验(TET)和冠状动脉造影(CAG)检查病例的临床和心电图资料,揭示不同程度和范围的冠状动脉病变和Duke评分的相关性。结果Duke评分与冠心病高危因素(高血压、糖尿病、高脂血症)呈明显相关性(P<0.05)。Duke评分与冠脉病变的严重程度和范围呈明显相关性(P<0.001)。低危Duke评分组47例无>75%狭窄,8例1支血管>75%狭窄,13例2支血管>75%狭窄或前降支病变,2例3支血管>75%狭窄或左主干病变;中危Duke评分组22例无>75%狭窄,13例1支血管>75%狭窄,51例2支血管>75%狭窄或前降支病变,9例3支血管>75%狭窄或左主干病变;相比而言,高危Duke评分组1例无>75%狭窄,2例1支血管>75%狭窄,18例2支血管>75%狭窄或前降支病变,33例3支血管>75%狭窄或左主干病变。结论Duke评分综合了临床资料、冠状动脉解剖及左室射血分数等预测因素,可作为预测有意义的冠脉病变的一个独立因素。该评分方法除了提供准确的预后评价,而且可以预测冠脉病变严重程度。     

Duke评分预测胸痛患者冠脉病变程度的价值

目的探讨胸痛合并三个及以上心血管病危险因素患者Duke评分预测冠状动脉病变程度的价值。方法选择2008年2月至2013年5月在北京大学人民医院接受平板运动试验并完成冠脉造影检查的胸痛患者118例，依据合并的危险因素数量将患者分为危险因素≥3个和危险因素〈3个两组，分析两组患者Duke评分与冠脉病变的相关性，并分别分析两组中不同年龄亚组（〈65、≥65岁）的Duke评分与冠状动脉评分的相关性。结果危险因素数量t≥个或〈3个的患者中，Duke评分与冠状动脉ACC评分均呈负相关（r=-0．538，p〈0．001；r=-0．482，p〈0．001）。危险因素数量≥3组，年龄〈65岁患者和年龄≥65岁的老年患者其Duke评分与冠状动脉ACC评分均负相关（r=-0．392，p=0．01；r=-0．805，p=0．002）；在危险因素数量〈3组，年龄〈65岁患者的Duke评分与冠状动脉ACC评分负相关（r=-0．578，p〈0．001），而年龄≥65岁的老年患者Duke评分与冠状动脉ACC评分不相关（p=0．786）。结论平板运动试验Duke评分对冠状动脉病变程度的预测不受患者合并的危险因素数量的影响。在合并较多危险因素（≥3个）时，平板运动试验Duke评分对冠状动脉病变程度的预测不受年龄因素的影响。     

The treadmill exercise score revisited: coronary arteriographic and thallium perfusion correlates.

The treadmill exercise score has been used to stratify patients into low-, moderate-, and high-risk groups. This score is derived from ST segment depression, angina, and exercise duration. To determine the coronary arteriographic and exercise thallium perfusion correlates of the score, we examined the extent of coronary artery disease and exercise single photon emission computed thallium-201 results in 834 patients for whom cardiac catheterization data were available. Of those, 174 had no coronary artery disease, 195 had one-vessel, 246 had two-vessel, and 219 had three-vessel disease. Based on the treadmill exercise score, 369 were in the low-risk, 384 in the moderate-risk, and 81 in the high-risk group. The extent of coronary artery disease was 2.1 +/- 1 diseased vessels in the high-risk, 1.7 +/- 1 in the moderate, and 1.4 +/- 1.1 in the low-risk group (p < 0.01). The extent of the thallium abnormality (maximum number of abnormal segments 120/patient) was 10 +/- 6 in the high-risk, 7 +/- 6 in the moderate, and 6 +/- 5 in the low-risk group (p < 0.05). Based on the extent of coronary artery disease and results of thallium imaging, patients were reclassified into three groups: group 1 had three-vessel disease and/or > or = 10 abnormal segments (n = 387), group 3 had no coronary artery disease or one-vessel disease and less than five abnormal segments (n = 212), and the remaining patients were in group 2 (n = 235).(ABSTRACT TRUNCATED AT 250 WORDS)     

A comparison of treadmill scores to diagnose coronary artery disease

Background: Recently, several treadmill scores have been proposed as means for improving the diagnostic accuracy of the exercise treadmill test (ETT). Questions remain regarding the diagnostic accuracy of treadmill scores when applied to a different patient population than that from which they were derived; furthermore, many treadmill scores have not been compared with one another in the same population. Hypothesis: The diagnostic accuracy of treadmill scores may not be the same. Methods: A retrospective analysis of data collected prospectively was performed on consecutive patients referred for evaluation of chest pain. All patients underwent a standard ETT followed by coronary angiography. Using angiographic evidence of coronary artery disease (CAD) as a reference, the area under the curve (AUC) of receiver operator characteristic (ROC) plots of the ST response alone, the Duke Treadmill Score (DTS), the Morise score, the Detrano score, the VA score, and a Consensus score consisting of the Morise, Detrano, and VA scores together were calculated and compared. The predictive accuracies of the DTS and the Consensus score to stratify patients for the likelihood of CAD were calculated and compared. Results: In all, 1,282 patients without a prior myocardial infarction had an ETT and coronary angiography. The AUC (± standard error) was 0.67 ± 0.01 for the ST response, 0.73 ± 0.01 for DTS, 0.76 ± 0.01 for Detrano score, 0.77 ± 0.01 for Morise score, 0.78 ± 0.01 for VA score, and 0.78 ± 0.01 for Consensus score. The AUC for each treadmill score was significantly higher (z‐score > 1.96) than for the ST response alone. The AUC of DTS was significantly lower than all other treadmill scores (z‐score > 1.96). The predictive accuracy (± 95% confidence interval) of the DTS to risk stratify patients into high and low likelihood for CAD was 71 (65‐77)%, versus 80 (74‐86)% for the Consensus score (p < 0.0001). Conclusion: In this population, the DTS remains useful for diagnosing CAD and stratifying for the likelihood of CAD, although it is less accurate than other treadmill scores.     

The diagnostic utility of the basal and post-exercise QRS-T angle in patients with stable coronary artery disease

Background

To evaluate the diagnostic utility of basal and post-exercise QRS-T angle in patients with stable coronary artery disease (CAD).

Methods

This cross-sectional and observational study analyzed 190 patients with stable angina. The QRS-T angle is measured on the 12-lead electrocardiograms at baseline and just after stopping the treadmill stress test in patients undergoing conventional coronary angiography (CAG). The pre- and post-exercise QRS-T angle and ΔQRS-T angle were analyzed.

Results

Of the 190 patients, 66 (34.7%) were assigned to group 1 (patients with coronary lesion) and 124 (65.3%) to group 2 (patients without coronary lesion) after CAG. There was no statistically significant difference in QRS-T angle between groups at baseline (pre-exercise) (30.7 ± 17 vs. 27.8 ± 12.8, p = .233). The QRS-T angle value was significantly higher in group 1 than in group 2 (68.8 ± 40.3 vs. 22.7 ± 21.5, p = .01) after exercise (post-exercise). The ΔQRS-T angle was also significantly higher in group 1 than in group 2 (38.1 ± 37.6 vs. −5.1 ± 22.9, p = .01). Receiver operating characteristic curve revealed that the cut-off value of QRS-T angle (post-exercise) for the coronary obstruction was >51.5° with 81% of sensitivity and 66% of specificity (AUC: 0.832, p = .001, CI: 0.769–0.894). Duke treadmill score for coronary stenosis was >1.5 with 77% of sensitivity and 69% of specificity (AUC: 0.814, p = .001, CI: 0.749–0.878).

Conclusion

It could be proposed that post-exercise QRS-T angle and Δ QRS-T angle are significantly associated with coronary obstruction in patients with stable angina and appear to be more sensitive than the Duke treadmill score and traditional electrocardiographic parameters.     

平板运动试验阴性的冠心病患者62例冠状动脉造影分析

目的 :为了解平板运动试验阴性的冠心病患者临床与冠脉病变特点 ,以提高诊断水平。方法 :对平静心电图正常及平板运动试验阴性而冠状动脉造影确诊为冠心病的 6 2例患者的临床资料及冠状动脉造影结果进行分析。结果 :冠心病危险因素 :高脂血症 40例 （6 5 %） ,高血压病 2 8例 （45 %） ,糖尿病 16例 （2 6 %） ,吸烟者 30例 （48%）。冠状动脉造影显示 2～ 3支血管病变占 6 5 %（40 / 6 2 ） ,包括左主干受累 4例 ;单支血管病变占 36 %（2 2 / 6 2 ）。 2～ 3支血管病变 40例中 34例 （85 %）血管狭窄部位相互对应。2支血管病变为前降支和右冠者多见 ,占 5 4%（14/ 2 6 ） ,单支血管病变以前降支者多见 ,占 5 9%（13/ 2 2 ）。73%（16 / 2 2 ）单支血管狭窄为 5 0 %～ 74%。结论 :对临床疑为冠心病的患者 ,即使平板运动试验阴性也应及早作冠脉造影检查以明确诊断。     

平板运动试验Duke评分对冠心病诊断的价值

目的：探讨平板运动试验Duke评分对冠心病诊断的价值。方法：选择疑诊冠心病的患者200例,两周内分别完成生化检查、平板运动试验及冠脉造影检查,对平板运动试验Duke评分（DTS）及冠脉造影结果进行比较分析。结果：冠脉造影结果被视为诊断冠心病的金标准。（1）与平板运动试验比较：单独DTS阳性诊断冠心病的特异性（72．3％比55．4％,Х^2=5．161,P=0．021）显著降低;运动试验联合DTS显著提高诊断冠心病的敏感性（72．6％比87．8％,Х^2=7．860,P=0．005）、阴性预测值（56％比76．9％,Х^2=6．128,P=0．013）;（2）与DTS阳性比较,运动试验联合DTS显著提高诊断冠心病的敏感性（76．3％比87．8％,Х^2=4．334,P=0．037）、阴性预测值（52．9％比76．9％,Х^2=7．298,P=0．007）、准确性（69．5％比80．8％,Х^2=5．849,P=0．016）。结论：联合应用运动试验及Duke评分可显著提高诊断冠心病的敏感性、阴性预测值和准确度。     

Relation between Duke treadmill score and coronary flow reserve using transesophageal Doppler echocardiography in patients with microvascular angina

OBJECTIVES: The link between coronary flow reserve (CFR) and Duke treadmill score (DTS) in patients with microvascular angina remains elusive. METHODS: We studied 108 subjects (M/F=48:60, mean age 54+/-9 years) with chest pain and normal coronary angiogram. ETT was performed by Bruce's protocol and the equation for calculating DTS was DTS=exercise duration-(5x ST deviation)-(4x exercise angina), with 0=none, 1=nonlimiting, 2=exercise limiting. The coronary flow velocity at diastole (PDV) using transesophageal Doppler echocardiography (TEE) was obtained from the proximal left anterior descending coronary artery and CFR was calculated as the ratio of hyperemic PDV after the intravenous infusion of dipyridamole (0.56 mg/kg) to baseline PDV. RESULTS: CFR was 3.04+/-0.45 in group with negative ETT and 2.19+/-0.62 in group with positive ETT (P<0.001) and was 1.51+/-0.31 in high risk group with a score of < or = -11, 2.39+/-0.63 in moderate risk group with scores between -11 and + 5, and 3.04+/-0.43 in low risk group with a score of > or = +5 on DTS (P<0.001 versus low risk group, respectively). DTS has significant correlation with CFR (r=0.704, P<0.001). CONCLUSIONS: DTS is a composite index that reflects CFR and helps clinicians determine the severity of ischemia in patients with microvascular angina.     

Angiographic evaluation of high-risk treadmill scores in patients with unstable angina according to sex, age, or use of drugs with a negative chronotropic effect

INTRODUCTION AND OBJECTIVES: The aim of the study is to determine whether age, sex, or the use of drugs with a negative chronotropic effect modifies the sensitivity, specificity, positive or negative predictive value, or positive or negative likelihood ratio of the high-risk criteria used in exercise testing as defined by the Spanish Society of Cardiology (SEC) and the American College of Cardiology/American Heart Association (ACC/AHA), the Duke treadmill score, the Veterans Affairs and West Virginia prognostic score, or the ST/Heart Rate Index at the time when left main coronary artery disease, three-vessel disease or two-vessel disease involving the proximal left anterior descending artery is detected by coronary angiography. METHODS: The study included a cohort of 469 consecutive patients aged 75 years who were admitted to hospital for unstable angina. All patients underwent exercise stress testing and coronary angiography. RESULTS: In all situations, the ACC/AHA high-risk criteria had the highest sensitivity, negative predictive value, and negative likelihood ratio, and the Duke Treadmill Score had the highest specificity and positive predictive value. The diagnostic accuracy of the other treadmill scores was affected by sex, age or the use of drugs with a negative chronotropic effect. CONCLUSIONS: The ACC/AHA high-risk criteria and Duke Treadmill Score provided useful additional information during the assessment of ST-segment depression. These measures could help improve the diagnostic accuracy of conventional ECG exercise testing in women, older individuals, and patients taking beta-blockers or non-dihydropyridine calcium antagonists.