Diagnostic and prognostic value of minor elevated cardiac troponin levels for percutaneous coronary intervention-related myocardial injury:a prospective,single-center and double-blind study

Cardiac troponin-I （cTnI） and -T （cTnT） are sensitive and specific markers of myocardial injury. However, the role of increased cTnI and cTnT in percutaneous coronary intervention （PCI）-related myocardial injury remains controversial. In this prospective, single-center and double-blind study, we aimed to determine the diagnostic and prognostic value of cTnI as well as cTnT （cTns） in PCI-related myocardial injury in a Chinese population. A total of 1,008 patients with stable angina pectoris and non-ST-segment elevation acute coronary syndrome were recruited. The levels of cTnI and cTnT were examined before and after PCI. All patients were followed up for 26± 9 months to observe the incidence of major adverse cardiac events （MACEs）. Our results showed that post- PCI cTnI and/or cTnT levels were increased to more than the 99^th percentile upper reference limit （URL） in 133 （13.2%） patients, among which 22 （2.2%） were more than 5 × 99^th percentile URL. By univariate analysis, an elevation in cTns after PCI was not an independent predictor of increased MACEs, HR 1.35 （P = 0.33, 95% CI： 0.74-2.46）. In conclusion, our data demonstrate that the incidence of PCI-related myocardial injury is not common in a Chinese population and minor elevated cTns levels may not be a sensitive prognostic marker for MACEs.

Comparison of plasma microRNA-1 and cardiac troponin T in early diagnosis of patients with acute myocardial infarction

BACKGROUND:Early reperfusion can effectively treat acute myocardial infarction(AMI) and reduce the mortality signif icantly. This study aimed to compare the role of plasma microRNA-1(miR-1) and cardiac troponin T(cTnT) in early diagnosis of AMI patients.METHODS:From May 2011 to May 2012,plasma samples were collected from 56 AMI patients and 28 non-AMI controls. The expression of plasma miR-1 was measured by quantitative reverse transcription-polymerase chain reaction(qRT-PCR),and the level of plasma cTnT was measured using electrochemiluminescence-based methods on an Elecsys 2010 Immunoassay Analyzer. SPSS 16.0 was used for the statistical analysis of the results. Data were expressed as mean±standard deviation unless otherwise described. The differences about clinical characteristics between the AMI patients and controls were tested using Student's t test or Fisher's exact test. The Mann-Whitney U test was conducted to compare the expression of microRNAs between the AMI patients and controls. MicroRNAs expression between different intervals of the AMI patients was compared using Wilcoxon's signed-rank test. The receiver operating characteristic(ROC) curve was established to discriminate the AMI patients from the controls.RESULTS:In the present study,the expression of plasma miR-1 was signifi cantly increased in the AMI patients compared with the healthy controls(P<0.01). The plasma miR-1 in the AMI patients decreased to the normal level at 14 days(P>0.05). The expression of plasma miR-1 was not related to the clinical characteristics of the study population(P>0.05). ROC curve analyses demonstrated that miR-1 was specifi c and sensitive for the early diagnosis of AMI,but not superior to cTnT.CONCLUSION:Plasma miR-1 could be used in the early diagnosis of AMI,but it is similar to cTnT.

Myocardial Injury after Electric Accident: Dynamic Change of Cardiac Biomarkers Was the Important Key for Diagnosis of This Serious Complication

This report was aimed to record the value of dynamic change of cardiac biomarkers in diagnosis of serious myocardial injury in electrical shock. One female patient was admitted to the emergency department, Cho Ray-Phnom Penh Hospital, Phnom Penh, Cambodia after electrical accident, in cardiopulmonary arrest status with no pulse, no breath. The cardiopulmonary resuscitation was done immediately as intra-tracheal ventilation, fluid replacement with NaCl 0.9%, urine alkalinization therapy with Natribicarbonate 4.2%, sympathomimetic agents as adrenaline and nor-adrenaline, and IV nutrition with glucose 30%. Cardiac biomarkers were repeated many times over 12 hours after admission. Troponin I increased 1000 times higher from 0.02 ng/mL on admission to 20.1 ng/mL within 12 hours. CK-MB increased from 55.4 to 227 U/L after 2 hours (normal value: <16 U/L). CPK (normal value: 90 - 140 U/L) changed quickly from 99 U/L on admission to a very high level as 9681 U/L after 12 hrs. The CK-MB/CPK index (defined as CK-MB × 100/CPK, unit as %) changed from 55.9% to 2.7%, respectively by time. In conclusion, the very quick dynamic change of cardiac biomarkers suggested the presence of serious myocardial injury among multiple organs injured in electric shock.

Protective effect of Xuebijing injection on myocardial injury in patients with sepsis: a randomized clinical trial

OBJECTIVE: To investigate the protective effect and possible mechanism of Xuebijing Injection on myocardial injury in patients with sepsis, and to evaluate its prognostic implications.METHODS: Patients with septic myocardial injury were recruited, and were randomly divided into two groups: treatment group and control group. All patients in two groups received conventional cluster treatment, the patients in treatment group additional received Xuebijing injection dissolved in0.9% sodium chloride injection, and the patients in control group received the same amount of 0.9%sodium chloride injection. At the beginning of treatment and 3, 7 and 10-day after treatment, lab-oratory indicators of cardiac troponin Ⅰ(cTnI),N-terminal pro B-type natriuretic peptide(NT-pro BNP) and procalcitonin(PCT) were respectively tested in venous blood. The patient's length of stay in Intensive Care Unit(ICU) and the mortality in 28 days were recorded.RESULTS: At 3, 7 and 10-day after treatment, the improvements of c Tn I, NT-pro BNP and PCT in treatment group were better than those in control group, and the differences were statistically significant(P < 0.05). The mortality of treatment group in28 days was not significantly different from that of control group(P > 0.05). The ICU length of stay of treatment group was shorter than that of control group(P > 0.05).CONCLUSION: Xuebijing injection could improve the levels of c Tn I, NT-pro BNP and PCT in patients with septic myocardial injury.and it had a protective effect on myocardial injury.

High-sensitivity cardiac troponins in everyday clinical practice

High-sensitivity cardiac troponin(hs-cTn) assays are increasingly being used in many countries worldwide,however,a generally accepted definition of high-sen-sitivity is still pending.These assays enable cTn mea-surement with a high degree of analytical sensitivity with a low analytical imprecision at the low measuring range of cTn assays(coefficient of variation of < 10% at the 99th percentile upper reference limit).One of the most important advantages of these new assays is that they allow novel,more rapid approaches to rule in or rule out acute coronary syndromes(ACSs) than with previous cTn assay generations which are still more commonly used in practice worldwide.hs-cTn is also more sensitive for the detection of myocardial damage unrelated to acute myocardial ischemia.Therefore,the increase in early diagnostic sensitivity of hs-cTn assays for ACS comes at the cost of a reduced ACS specificity,because more patients with other causes of acute or chronic myocardial injury without overt myocardial isch-emia are detected than with previous cTn assays.As hs-cTn assays are increasingly being adopted in clinical practice and more hs-cTn assays are being developed,this review attempts to synthesize the available clinical data to make recommendations for their everyday clini-cal routine use.

Impact of training specificity on exercise-induced cardiac troponin elevation in professional athletes: A pilot study

BACKGROUND Release of cardiac biomarkers is common after strenuous endurance exercise,but data on intermittent exercise are scarce.It has not been investigated whether cardiac troponin elevation is influenced depending on the type of exercise that an athlete is adapted to perform.We hypothesized that intermittent but not continuous exercise induces cardiac troponin elevation in professional athletes adapted to high-intensity intermittent exercise.AIM To examine how training specificity impacts high-sensitivity cardiac troponin T(hs-cTnT)release.METHODS Nine professional floorball players participated in the study,which comprised two different exercise tests:a continuous incremental cycle ergometer test and a Yo-Yo Intermittent Recovery 2(Yo-Yo IR2)test.Serial assessment of hs-cTnT was performed after the cycle ergometer test and the Yo-Yo IR2 test(baseline,0,2,6,and 24 h).RESULTS No hs-cTnT elevation above the myocardial damage cutoff(≥14 ng/L)was shown after the cycle ergometer test,whereas hs-cTnT levels rose over the cutoff in three of nine participants after the Yo-Yo IR2 test.The hs-cTnT levels peaked at 6 h after both tests,but were significantly higher after the Yo-Yo IR2 test compared to the cycle ergometer test(median hs-cTnT concentration 10.6 ng/L vs 7.8 ng/L,P=0.038).All levels returned to baseline within 24 h.CONCLUSION In professional athletes adapted to high-intensity intermittent exercise,hs-cTnT was significantly elevated after intermittent but not continuous exercise.This principle of specificity training should be considered when designing future studies to avoid misinterpretation of hs-cTnT elevation.

血清Myo、cTnI、NT-proBNP、心肌酶谱水平联合检测在心肌梗死诊断中的价值

目的:分析血清肌红蛋白(Myo)、肌钙蛋白I(cTnI)、N-末端脑钠肽前体(NT-proBNP)、心肌酶谱[肌酸激酶同工酶(CK-MB)、乳酸脱氢酶(LDH)、肌酸激酶(CK)]水平联合检测在心肌梗死诊断中的价值。方法:选取2021年5月至2023年5月郑州市惠济区人民医院收治的78例心肌梗死患者进行横断面研究,设为观察组;选取同期该院收治的78例冠心病非心肌梗死患者进行横断面研究,设为对照组。比较两组血清Myo、cTnI、NT-proBNP、CK-MB、LDH、CK水平;采用受试者工作特征(ROC)曲线分析血清Myo、cTnI、NT-proBNP、CK-MB、LDH、CK水平单项及联合检测诊断心肌梗死的价值。结果:观察组血清Myo、cTnI、NT-proBNP、CK-MB、LDH、CK水平均高于对照组,差异有统计学意义(P<0.05);ROC曲线分析结果显示,血清Myo、cTnI、NT-proBNP、CK-MB、LDH、CK水平单项及联合检测诊断心肌梗死的曲线下面积(AUC)分别为0.700、0.750、0.780、0.846、0.600、0.869、0.923,均有一定的诊断价值,其中联合检测的诊断价值高于六者单项检测诊断。结论:血清Myo、cTnI、NT-proBNP、CK-MB、LDH、CK水平联合检测诊断心肌梗死的价值高于六者单项检测诊断。

心肌肌钙蛋白I、D-二聚体及其比值对急性心肌梗死与主动脉夹层的早期鉴别诊断价值

目的 探究心肌肌钙蛋白I(cTnI)、D-二聚体及其比值对急性心肌梗死(AMI)与主动脉夹层(AD)鉴别诊断的价值。方法 选取2017年1月至2022年3月郑州大学第五附属医院收治的115例急性心肌梗死患者(急性心肌梗死组)、78例主动脉夹层患者(主动脉夹层组)进行回顾性研究。比较入院后两组患者cTnI及D-二聚体水平,并通过受试者工作特征(ROC)曲线评估cTnI、D-二聚体及其比值对AMI与AD的鉴别诊断价值。结果 急性心肌梗死组患者cTnI水平高于主动脉夹层组,D-二聚体水平低于主动脉夹层组,差异有统计学意义(P<0.001)。ROC曲线显示,cTnI鉴别AMI与AD时,其曲线下面积(AUC)为0.916,最佳截断值为0.34μg·L^(-1),诊断灵敏度为89.6%,特异度为88.5%;D-二聚体鉴别AMI与AD时,AUC值为0.915,最佳截断值为1.15 mg·L^(-1),诊断灵敏度为87.2%,特异度为83.5%;cTnI与D-二聚体的比值联合鉴别AMI与AD的AUC值为0.985,最佳截断值为0.33,诊断灵敏度为93.9%,特异度为96.2%;cTnI、D-二聚体的数据拟合后联合鉴别诊断AMI与AD时,AUC值为0.983,诊断灵敏度为95.7%,特异度为96.2%。结论 cTnI与D-二聚体对于鉴别AMI与AD均具有较高的敏感度和特异度,而cTnI与D-二聚体的比值及二者联合检测对AMI与AD患者的鉴别诊断价值更高。

Myocardial Protection with Beta Blocker Treatment in Infants with Heart Failure Due to Congenital Heart Defects and Duchenne Muscular Dystrophy

Our first intention to treat infants’ heart failure with beta blockers was to improve the clinical condition as shown in our prospective randomized trial. We only use non-selective beta blockers in these infants, carvedilol in those with left ventricular dysfunction and propranolol in those with congenital heart disease without ventricular dysfunction. Despite a significant improvement of Ross’s heart failure score, we could not convince most colleagues within the last 25 years if the concept of neurohumoral activation in heart failure is not well-established pediatric cardiology. Recently, Honghai Liu et al. published that cardiomyocyte cytokinesis failure was increased in congenital heart disease. Inactivation of the beta adreno receptors genes and administration of the beta-blocker propranolol increased cardiomyocyte division in neonatal mice, which increased the number of cardiomyocytes (endowment) and conferred benefit after myocardial infarction in adults. We currently realize that propranolol in infants with congenital heart disease not only decrease highly elevated NT-Pro-BNP values but also decrease cardiac troponin T values that may indicate myocardial injury due to neurohumoral activation. We reproduce this observation, primarily seen in infants with congenital heart disease, in an infant with Duchenne muscular dystrophy. These observations were in good accordance with current data from H. Liu et al., who showed that treatment with non-selective beta blockers early after birth might rescue cytokinesis defects and prevent heart dysfunction in adulthood in a mouse model.

血清肌钙蛋白I水平升高对足月新生儿心肌损伤的诊断效果

目的:探讨血清肌钙蛋白I(cardiac troponin I,cTnI)水平升高对足月新生儿心肌损伤的诊断效果。方法:选择2020年8月至2022年8月南京医科大学附属儿童医院新生儿病房收治的入院24 h内治疗前cTnI水平>0.04 ng/mL的足月新生儿240例,检测治疗7 d后cTnI水平,将118例cTnI水平持续升高者纳入A组,将122例cTnI水平降低者纳入B组。对比2组临床资料、感染指标、心肌损伤指标、影像学检查指标及病因情况。结果:A组剖宫产率较B组高(P<0.05);A组新生儿性别、出生体重、日龄、围产期缺氧窒息史、临床症状、新生儿母亲孕期合并症与B组相比,差异均无统计学意义(均P>0.05);A组降钙素原(procalcitonin,PCT)水平较对照组高(P<0.05),A组C反应蛋白(C-reactive protein,CRP)、白细胞(white blood cell,WBC)水平与B组相比,差异无统计学意义(P>0.05);A组肌酸激酶(creatine kinase,CK)、肌酸激酶同工酶MB(creatine kinase MB,CK-MB)、B型钠尿肽(B-type natriuretic peptide,BNP)水平与B组比较,差异均无统计学意义(均P>0.05);A组心胸比值、左心扩大比例、ST-T改变、一过性窦性心动过缓、同时出现≥2种心率失常的比例均较B组高(均P<0.05);经多因素logistic回归分析,结果可见新生儿高胆红素血症、新生儿败血症最终进入回归方程(P<0.05)。结论:血清cTnI水平升高使心电图改变、心脏扩大、心脏磁共振改变概率上升,新生儿心肌损害持续存在,严重者可致预后不佳,新生儿败血症及新生儿高胆红素血症是新生儿心肌损害的主要影响因素,临床应加强对新生儿血清cTnI水平的监测。

急性心肌梗死标志物检测方法研究进展

心血管疾病尤其急性心肌梗死(AMI)发病率和病死率逐年上升,及时、准确地检出AMI并尽早给予治疗,对保障患者及患者家庭的生活质量、促进社会稳定发展具有重要意义。AMI相关心肌损伤标志物的检测可为AMI的及时准确诊断和预后评估提供重要依据。该文对与AMI相关特异性酶或蛋白类心肌损伤标志物如肌酸激酶、天冬氨酸转氨酶、乳酸脱氢酶、肌红蛋白、心肌肌钙蛋白等的特点进行了阐述,并对其检测方法(包括免疫层析法、酶联免疫吸附试验、比色法、化学发光分析法、荧光分析法和电化学分析法)的新进展进行了探讨,为AMI标志物早期诊断技术的研究提供参考依据。临床实验室应在优化现有AMI标志物检验方法的基础上,研发更为便捷的AMI标志物生物传感检测方法,发展更为准确且快速的AMI标志物即时检测技术,寻找早期诊断AMI的新型生物标志物,共同助力AMI的精准治疗。

血浆B型利钠肽、心肌肌钙蛋白I及心肌酶评估有机磷中毒伴发心肌损害的研究

目的:血浆B型利钠肽、心肌肌钙蛋白I、心肌酶评估有机磷中毒伴发心肌损害的价值。方法:128例有机磷中毒伴发心肌损害患者为有机磷中毒组,并根据中毒程度分为轻度中毒亚组41例,中度中毒亚组47例,重度中毒亚组40例。32例健康者作为对照组,给以受试者常规治疗后第1、3、5、7天进行静脉取血,检测血浆B型利钠肽和血清心肌肌钙蛋白I、心肌酶浓度。结果:四个时间点有机磷中毒组患者血浆B型利钠肽和血清心肌肌钙蛋白I、心肌酶浓度均显著高于对照组(P<0.05);有机磷中毒组患者随着中毒程度的加深,血浆B型利钠肽和血清心肌肌钙蛋白I、心肌酶浓度随之显著性增高(P<0.05)。结论:血浆B型利钠肽和血清心肌肌钙蛋白I、心肌酶浓度随着有机磷中毒程度的加深而不断增大,可用于有机磷中毒并发心肌损害的及时、有效的诊断和评估。

和肽素联合高敏心肌肌钙蛋白I对心肌肌钙蛋白轻度增高的急性心肌梗死的早期诊断价值

目的 探讨和肽素联合高敏心肌肌钙蛋白I(high-sensitivity cardiac troponin I,hs-cTnI)对肌钙蛋白轻度增高的急性心肌梗死的早期诊断价值。方法 选取2019年6月至2020年6月河北大学附属医院心内科冠心病监护病房收治的42例cTnI轻度增高的疑诊急性心肌梗死患者为研究对象,入院即刻和入院后1h抽取静脉血,采用酶联免疫吸附法检测和肽素及hs-cTnI水平。根据冠脉造影结果将患者分为急性心肌梗死组(37例)和非急性心肌梗死组(5例)。采用受试者工作特征(receiver operating characteristic,ROC)曲线评估hs-cTnI及和肽素诊断急性心肌梗死的临床效能。结果 根据ROC曲线分析,入院时及入院后1h和肽素诊断肌钙蛋白轻度增高的急性心肌梗死的曲线下面积(area under the curve,AUC)分别为0.730(95%CI 0.560~0.899)、0.589(95%CI 0.387~0.792);hs-cTnI诊断肌钙蛋白轻度增高的急性心肌梗死的AUC分别为0.757(95%CI 0.599~0.915)、0.805(95%CI 0.621~0.990)。和肽素与hs-cTnI联合诊断肌钙蛋白轻度增高的急性心肌梗死的AUC为0.811(95%CI 0.666~0.956),高于和肽素及hs-cTnI单独检测。结论 和肽素联合hs-cTnI早期诊断肌钙蛋白轻度增高的急性心肌梗死的效能优于二者单独检测,入院后1h复测hs-cTnI可作为肌钙蛋白轻度增高的急性心肌梗死早期诊断的有效指标。

窒息新生儿血清肌钙蛋白I和磷酸肌酸激酶同工酶变化的意义

目的探讨血清肌钙蛋白I(cTnI)和磷酸肌酸激酶同工酶(CK-MB)对窒息新生儿心肌损伤的早期诊断价值。方法选择轻度窒息新生儿29例(轻度组)、重度窒息新生儿18例(重度组)。采用ELISA法和酶动力法检测新生儿血清cTnI水平和CK-MB活性。结果出生d1窒息新生儿血清cTnI和CK-MB水平在轻度组[(2.25±0.54)μg/L、(223.4±23.5)U/L]和重度组[(4.25±0.83)μg/L、(256.3±21.8)U/L]均显著高于对照组(Pa<0.01);重度组血清cTnI和CK-MB水平均显著高于轻度组(Pa<0.01)。治疗后d7窒息新生儿血清cTnI和CK-MB水平均明显下降,轻度组[(0.69±0.18)μg/L、(151.4±18.4)U/L]与对照组均无显著差异(Pa>0.05),重度组[(1.54±0.72)μg/L、(188.9±21.5)U/L]显著高于轻度组和对照组(Pa<0.01)。结论窒息新生儿伴心肌损伤时血清cTnI和CK-MB水平升高;动态观察可用于窒息新生儿微小心肌损伤的早期诊断。

蘑菇中毒导致心肌损伤的危险因素分析及预测模型构建与验证

目的 回顾性分析蘑菇中毒患者发生心肌损伤的危险因素并构建与验证预测模型。方法 将2012年7月至2023年9月湖南省人民医院和广西壮族自治区贵港市平南县人民医院收治的蘑菇中毒患者211例,根据中毒后有无心肌损伤情况分为两组,比较两组中毒患者的一般资料、心肌酶谱、心电图等情况,采用单因素和多因素回归分析蘑菇中毒患者发生心肌损伤的危险因素,并据此构建与验证危险因素预测模型。结果 单因素分析显示,心肌损伤组患者乳酸脱氢酶、肌酸激酶、肌酸激酶同工酶、肌红蛋白、肌钙蛋白Ⅰ、心电图异常均高于非心肌损伤组患者(P均<0.05),血红蛋白、血钙均低于非心肌损伤组患者(P均<0.05)。多因素回归分析结合ROC曲线分析表明,肌红蛋白、肌钙蛋白Ⅰ水平升高,血钙水平降低,以及心电图异常是蘑菇中毒导致心肌损伤的独立危险因素。通过Hosmer-Lemeshow检验,模型的内部一致性良好,拟合优度高(P>0.05)。结论 肌红蛋白、肌钙蛋白Ⅰ、血钙、心电图异常是预测蘑菇中毒导致心肌损伤的重要因素。在临床实践中,应重视高危因素的识别,监测相关指标,并及时采取干预治疗,以促进患者康复。

CK-MB及cTnI对手足口病患儿心肌损伤的诊断价值研究

目的探讨血清肌酸激酶同工酶(CK-MB)、心肌肌钙蛋白I(cTnI)对手足口病(HFMD)患儿心肌损伤的诊断价值。方法选择2012年7月至2013年6月住院治疗的HFMD患儿80例(HFMD组),同期体检健康儿童50例(对照组)。比较两组血清CK-MB、cTnI水平。结果 HFMD组治疗前CK-MB、cTnI水平分别为(38.10±19.50)U/L、(0.08±0.02)μg/L,均高于对照组(P<0.05)。HFMD患儿治疗前CK-MB、cTnI阳性率分别为56.3%、33.8%,阳性率比较差异有统计学意义(P<0.05)。经治疗后,HFMD患儿CK-MB、cTnI水平均明显下降(P<0.05)。结论联合检测血清CK-MB、cTnI对HFMD合并心肌损伤的早期诊断具有重要临床意义。

过表达Nrf2基因对心肌缺血-再灌注血流动力学和cTnI浓度的影响

目的探讨过表达核因子(NF)-E2相关因子2(Nrf2)基因对大鼠心肌缺血-再灌注损伤(MIRI)血流动力学和心肌肌钙蛋白I(cTnI)浓度的影响。方法 30只SD大鼠随机分为三组(n=10):假手术组(Sham组)、MIRI组、过表达Nrf2基因组(Nrf2组)。Sham组和MIRI组经冠脉转染携带绿色荧光蛋白的腺病毒载体(Ad-EGFP)至心肌组织,Nrf2组转染携带Nrf2基因的腺病毒载体(Ad-Nrf2)。稳定3d后,三组建立MIRI模型,观察缺血前(T0)、缺血30min(T1)、再灌注30min(T2)和再灌注120min(T3)时HR、左室舒张末期压力(LVEDP)、左室收缩末期压(LVESP)、心室最大压力上升和下降速率(±dp/dtmax)。再灌注120min检测心肌肌钙蛋白I(cTnI)含量。结果与T0时比较,T1～T3时MIRI组、Nrf2组HR明显减慢、LVESP和±dp/dtmax明显降低,LVEDP明显升高(P<0.05)。与Sham组比较,T1～T3时MIRI组、Nrf2组HR明显减慢、LVESP、±dp/dtmax明显降低,LVEDP明显升高(P<0.05)。与MIRI组比较,T1～T3时Nrf2组LVESP和±dp/dtmax明显升高、LVEDP明显降低(P<0.05)。再灌注120min,MIRI组cTnI含量为(6.7±2.5)ng/ml,Nrf2组为(4.6±2.1)ng/ml,明显高于Sham组(1.4±0.4)ng/ml(P<0.05),Nrf2组明显低于MIRI组(P<0.05)。结论大鼠心肌过表达Nrf2基因能够改善心肌缺血-再灌注损伤带来的血流动力学紊乱和抑制cTnI浓度的上升。

心脏肌钙蛋白I测定在心血管疾病诊断中的初步应用

目的探讨心脏肌钙蛋白Ｉ（ｃＴｎＩ）测定对心血管疾病心肌损伤的诊断价值。方法用固相层析免疫法测定急性心肌梗死（ＡＭＩ），心绞痛（ＡＰ）、病毒性心肌炎（ＶＭ）、原发性高血压（ＥＨ）和射频消融（ＲＦＣＡ）术后患者血清ｃＴｎＩ。结果 ＡＭＩ、 ＶＭ和 ＲＦＣＡ术后患者血清 ｃＴｎＩ阳性率显著高于正常人（Ｐ＜０．００５）。 ＡＭＩ组ｃＴｎＩ强阳性者较其他组显著增多（Ｐ均＜０． ００１）， Ｉ多数２周内转阴；而 ＶＭ组和 ＲＦＣＡ组弱阳居多（ Ｐ＝０． ２）， ＶＭ患者多于１个月左右转阴； ＲＦＣＡ术后 ７２ｈ内即可转阴。 ｃＴｎＩ测定敏感性高于心肌酶学（Ｐ＜０．００５）。结论 ｃＴｎＩ是一特异性和敏感性具佳的心肌损伤血清标志物，对不同病理改变及不同病理进程的心肌损伤之诊断具有重要应用价值。