心电图和心肌标志物与急性冠脉综合征的关系分析

目的对急性冠脉综合征(ACS)患者的心电图(ECG)和肌钙蛋白I(cTnI)的关系进行分析,以探讨其对ACS患者血管病变程度的诊断价值。方法对37例ACS确诊患者的ECG和cTnI进行检测,分析ECG和cTnI阳性与血管闭塞和血管狭窄的关系,及两指标间的一致性。统计分析采用χ2检验和logistic回归分析。结果ECG与cTnI阳性的患者,其血管闭塞发生率(P=0.016;P=0.003)和血管狭窄发生率(P=0.121;P=0.013)均较ECG与cTnI阴性的患者高。但在血管闭塞和血管狭窄与ECG和cTnI的logistic分析中,仅cTnI差异有统计学意义(P=0.013;P=0.021)。ECG与cTnI具有较好的一致性(Kappa=0.617,P<0.001)。结论ECG与cTnI定性检测均能较好地反映ACS患者的血管病变程度,具有临床指导意义。     

充血性心力衰竭时甲状腺激素和肌钙蛋白Ⅰ的变化

目的　探讨充血性心力衰竭 (congestiveheartfailure ,CHF)时血清甲状腺激素 (thyroidhor mone ,T3)和肌钙蛋白Ⅰ (troponinⅠ ,cTnI)异常变化及意义。方法　收集CHF患者 6 0例 ,其中心功能Ⅱ级、Ⅲ级、Ⅳ级各 2 0例。同时选取 30例健康人作为对照组。通过化学免疫荧光法定量测定血清T3及cTnI水平。结果　CHF患者血T3水平明显低于对照组 (P <0 0 1) ,而CHF患者血cTnI较对照组明显增高 (P <0 0 1)。心衰越重 ,降低或增高越明显。不同程度CHF患者 ,组间差异显著 (P <0 0 5 )。CHF纠正后 ,血T3明显回升 ,而cTnI明显下降 ;与治疗前相比 ,差异显著 (P <0 0 1)。结论　CHF患者血T3和cTnI变化与CHF严重程度密切相关 :而且CHF时 ,T3和cTnI呈负相关     

心肌肌钙蛋白Ⅰ和肌酸激酶MB同功酶的检测在急性心肌梗死早期诊断中的临床价值

目的 探讨心肌肌钙蛋白Ⅰ（cTnI）检测在早期诊断急性心肌梗死（AMI）中的临床价值。方法 检测30例AMI患者，35例不稳定性心绞痛（UAP）患者，30例骨骼肌损伤（SM）患者血清cTnI、CK—MB含量，与30例门诊健康体检者做对照比较；并对AMI患者在胸痛发生不同时段进行动态检测。结果AMI组与对照组相比．cTnI和CK—MB含量均明显升高差异有极显著性P〈0．01，AMI组与UAP和SM组比较，cTnI含量仍显著升高差异有极显著性P〈0．01，而CK—MB含量差异无显著性P〉0、05；cTnI在AMI发生4小时内就显著升高，二者的最高峰值在8～16小时内均可出现，72小时后，cTnI和CK—MB降至临界水平，而cTnI在7天后仍高于对照组。结论cTnI诊断AMI敏感性高，特异性强，在血清中出现时间早，持续时间长，有着更宽的诊断时间窗，诊断有效性明显优于CK-MB，对AMI患者的早期诊断和预后判断有较好的临床价值。     

慢性肾衰竭维持性血液透析合并丙型肝炎患者血清心肌肌钙蛋白的变化

目的　观察慢性肾衰竭 (CRF)维持性血液透析合并丙型肝炎患者血清心肌肌钙蛋白 (cTnI)的异常变化。方法　应用双抗夹心酶联免疫吸附法 (ELISA)检测 115例维持性血液透析患者分为丙型肝炎阳性组 70例和阴性组 4 5例及 6 4例正常人的血清cTnI。结果　慢性肾衰竭组血清cTnI阳性率为 17.4 % ,其中丙型肝炎阳性组为 2 0 % ,丙型肝炎阴性组为 13.3% ,丙型肝炎阳性组cTnI水平显著高于丙型肝炎阴性组 (P <0 .0 1)。结论　慢性肾衰竭血液透析患者的心肌损伤明显高于正常人群 ,合并丙型肝炎可加重慢性肾衰竭血液透析患者的心肌损伤 ,提示丙型病毒能引起心肌损伤     

Cardiac troponin I release and cytokine response during experimental human endotoxaemia

Objective To study the relationship between cytokine levels and cardiac troponin I (cTnI).Design Prospective experimental study.Setting Intensive care unit of a university hospital.Participants Six healthy male volunteers.Interventions Endotoxin, 4 ng/kg, was given as a 1-min intravenous infusion.Measurements and results Circulating cardiac troponin I levels and proinflammatory cytokines tumour necrosis factor- (TNF-), interleukin-6 (IL-6) and interleukin-8 (IL-8) were analysed at various time points during a 24-h period. TNF- appeared in the circulation 30 min after injection (T=0.5 h), reaching peak levels (5,665±1,910 pg/ml) 2 h after infusion. At T=24 h TNF- was still elevated in the circulation compared to T=0. None of the six volunteers had a cTnI value higher than 0.1 g/l at T=0, 6 h or 24 h.Conclusion The presence of significant amounts of TNF-, IL-6 and IL-8 in the systemic circulation does not lead to increased levels of cTnI in experimental human endotoxaemia.     

Combined measurements of N-terminal pro-brain natriuretic peptide and cardiac troponins in potential organ donors

Objective Brain death may induce cardiac dysfunction. In potential organ donors measurements of N-terminal pro-brain natriuretic peptide (NT-proBNP) and circulating cardiac troponins T and I (cTnT and cTnI), alone or in combination, are performed to investigate the accuracy of these biomarkers for early diagnosis of left ventricular systolic dysfunction. Design and setting Prospective study in a multidisciplinary intensive care unit of an university hospital. Patients 63 brain-dead patients scheduled for multiple organ harvesting. Measurements and results We measured NT-proBNP, cTnT, and cTnI and determined fractional area change (FAC) using transesophageal echocardiography. Forty-five patients had normal FAC, 9 a moderate decrease in FAC (30–50), and 9 a severe decrease in FAC (≤ 30%). NT-proBNP and cTnT concentrations were significantly higher in patients with a severe decrease in FAC than in those with a moderate decrease. Combining measurements of these two biomarkers, the sensitivity of the test to predict severe decrease in FAC increased significantly to reach 1.00 compared with the sensitivities of individual measurements. The ROC curve area of combined measurements of NT-proBNP and cTnT was significantly higher than single measurements: 0.87 vs. 0.82 for NT-proBNP, 0.78 for cTnT, and 0.72 for cTnI. Conclusions In potential organ donors the combined measurement of NT-proBNP and cTnT concentrations is more accurate than individual measurement of NT-proBNP, cTnT, and cTnI in the early diagnosis of severe left ventricular systolic dysfunction. These findings may lead to improve the quality of cardiac care of the potential organ donors.     

新生儿窒息后血清心肌肌钙蛋白T和心肌酶检测结果分析

目的探讨新生儿窒息后血清心肌肌钙蛋白T(cTnT)和心肌酶浓度变化与窒息程度的相关性。方法采用日立7600生化分析仪和罗氏2010电化学发光免疫分析仪检测窒息新生儿血清心肌酶和cTnT浓度。结果新生儿窒息后血清心肌酶活性显著增高,其增高程度与新生儿窒息程度呈正比;血清cTnT浓度增高与新生儿窒息后是否发生心血管并发症呈正相关。结论窒息并发心力衰竭的新生儿通过检测血清cTnT和心肌酶能及早发现心肌损害,并判断其严重程度。     

Impact of Changing Definitions for Myocardial Infarction: A Report from the AMIS Registry

Background

To assess the impact of the new definitions of myocardial infarction, we retrospectively analyzed 9190 patients from 63 hospitals with reported peak troponin values included between 2001 and 2007 in the Swiss AMIS (Acute Myocardial Infarction in Switzerland) Plus registry.

Methods

Patients were classified as belonging to the “classic” myocardial infarction group (peak total CK or CK-MB above the upper limit of normal, or troponin T [TnT] >0.1 μg/L or troponin I [TnI] >0.1-0.8 μg/L [depending on the assay]) or “new” myocardial infarction group (TnT >0.01 μg/L or TnI >0.01-0.07 μg/L).

Results

There were 489 patients in the “new” group who were similar to the 8701 “classic” patients in terms of age, sex, and prevalence of both diabetes and renal failure, but more frequently had a history of prior coronary artery disease, hypertension, and hyperlipidemia. At admission, they less frequently had ST elevation on their electrocardiogram, were more frequently in Killip class I, and received less primary percutaneous coronary intervention. Hospital mortality was 3.5% in the “new” and 6.7% in the “classic” myocardial infarction group (P = .004). In a subset of patients with a longer follow-up, mortality at 3 and 12 months was 1% and 5.6%, respectively, for “new” and 1.6% and 4%, respectively, for “classic” myocardial infarction (NS).

Conclusions

Patients with minimal elevation of serum troponin have smaller infarctions, less aggressive treatment, fewer early complications, and a better early prognosis than patients with higher serum biomarker levels. After discharge, however, their prognosis currently appears no different from that of patients with a “classic” myocardial infarction event.     

床边快检肌钙蛋白Ⅰ和肌红蛋白在急性心肌梗塞早期诊断中的应用

目的:探讨床边快检心肌肌钙蛋白I(cTnI)、肌红蛋白(Mb)在急性心肌梗塞(AMI)早期诊断中的应用以及二项之间的相互关系。方法:选择96例疑似ACS患者的血液标本,在不同时段,同时进行cTnI和Mb的测定。结果:在确诊的87例AMI早期诊断中,cTnI阳性出现滞后,3h内测定的阳性率为16.1%,显著低于Mb的阳性率(72.4%),P<0.01;24h内测定cTnI的阳性率为100%。结论:在急诊科床边快检cTnI与Mb对AMI的早期诊断非常必要,可起到优势互补的作用。