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。     

心肌酶谱与肌钙蛋白Ⅰ测定在急性心肌梗死早期诊断中的临床价值

目的:探讨心肌酶谱和肌钙蛋白Ⅰ(cTnI)测定在急性心肌梗死(AMI)早期诊断中的临床应用价值.方法:采用日立7600-020全自动生化分析仪及诊断试剂盒,检测了87例AMI患者心肌酶谱(AST、LDH、CK.、CK-MB)和cTnI,并比较其特异性和敏感性.结果:87例AMI患者血清cTnI、CK、CK-MB、AST、LDH水平与正常对照组比较差异均有非常显著性(P＜0.01),87例AMI患者中,75例心肌酶谱升高,82例肌钙蛋白Ⅰ阳性,敏感性分别为86.2%、94.3%;特异性分别为92.0%、96.0%.结论:心肌酶谱与cTnI测定在AMI早期诊断中具有重要的临床价值.     

冠脉介入治疗术后肌钙蛋白T升高相关因素

目的:探讨冠脉介入治疗对冠心病患者肌钙蛋白T(CTnT)的影响及相关因素。方法:选择择期冠脉介入治疗且术前CTnT正常的患者78例,监测术前和术后24 h CTnT水平,并观察患者住院期间心脏事件及并发症发生情况。结果:78例患者术后CTnT升高者31例,其发生率为39.7%。糖尿病、不稳定性心绞痛、分叉病变、植入支架数目是术后CTnT增高的预报因子,有较显著的统计学差异(P<0.05)。CTnT升高组术后发生心绞痛症状者较多,住院时间延长。结论:冠脉介入治疗术后心肌损伤发生率较高,临床及手术因素均与其相关,CTnT是重要的心肌损伤实验室监测指标。临床上应进行术前危险评估,积极干预,以改善     

Platelet count and MPV,routinely measured but ignored parameters used in conjunction with the diagnosis of acute coronary syndrome: single study center in Iranian population, 2010

Background

Myocardial infarction is the major cause of morbidity and mortality in industrialized countries. Platelet count and the mean platelet volume (MPV), a simple and reliable indicator of platelet size which correlates with platelet activation, might associate with troponin in acute chest pain.

Methods

We analyzed MPV of 851 patients who were admitted to Rasoul-e-Akram Hospital with acute chest pain during the year 2010. Two blood samples were taken from each patient within 4 hours of their arrival for routine hematology, including platelet count and MPV, and cardiac troponin T. Also, electrocardiograms of the patients were recorded. Association of MPV and platelet count with troponin was observed.

Results

The patients in troponin positive group, who had also ischemic electrocardiographic changes, had higher MPV values than non- acute coronary syndrome (ACS) patients with normal cardiac troponin T levels (9.9 vs 9.5 fl with p< 0.001). In troponin negative group, the mean of platelet count was higher than that in the positive group (221683 vs 198814/µl with p< 0.001).

Conclusion

MPV and platelet count are inexpensive laboratory tests which can be measured in association with other laboratory biomarkers in patients presenting with acute chest pain.This could help to lower hospitalization rates and also avoid misdiagnosis and having complications of patients with ACS.     

肌钙蛋白Ⅰ对慢性阻塞性肺病急性发作期低氧血症患者的意义

目的 探讨肌钙蛋白Ⅰ(cTnⅠ)对慢性阻塞性肺病急性发作期低氧血症患者心肌保护的临床意义.方法 135例慢性阻塞性肺病急性发作期低氧血症患者在入院时同时检测cTnⅠ、动脉血气.根据氧分压水平将患者分为3组:轻度缺氧组、中度缺氧组、量度缺氧组.同时选取本院健康职工20名作为对照组,检测分析各组间cTnⅠ和氧分压的关系.结果 与时照组相比,轻、中、重度三组患者cTnⅠ均显著升高(P＜0.05),轻中重3组间相比,cTnⅠ水平均有显著性差异(P＜0.05);氧分压水平和cTnⅠ升高水平呈显著负相关关系(P＜0.05).结论 慢性阻塞性肺病急性发作期患者低氧血症可以导致血清中cTnⅠ升高,且cTnⅠ升高水平和氧分压水平呈负相关.     

脓毒症休克心肌顿抑严重程度判断的临床研究

目的探讨脑钠肽（BNP）、心肌钙蛋白I（cTnI）、血乳酸及急性生理及慢性健康状况评分Ⅱ（APACHEⅡ评分）在脓毒症休克心肌顿抑严重程度判断中的应用价值。方法3l例确诊脓毒症休克患者,入院后1h内抽血查BNP、cTnI、血乳酸,并进行APACHElI评分,以后分别在开始治疗后6、24h监测上述指标。观察患者的最终预后,比较存活组和死亡组上述指标入院时的差异;分别比较不同预后组内各时间点上述指标的差异。结果3l例患者,死亡13例,存活18例,死亡率为41．9％。死亡组人院时各项指标数值均明显高于存活组[BNP：（3401．1±1710．2）pg／Lvs（1947．2±1319．5）pg／L,P=0．008;cTnI：（9．4±4．7）ng]L vs（5．1±4．4）．g／L,P=0．012;血乳酸：（10．8±4．9）mm01]L vs（7．1±4．5）mmol／L,P=0．027;APACHElI评分：29．4±5．7口s22．1-＋8．8,P：0．006]。死亡组患者中,治疗6h上述指标与入院时比较差异无统计学意义（P均〉0．05）,治疗后24hBNP[（4757．9-＋2044．4）pg／L vs（3401．1-＋1710．2）og／L,P=0．0111、血乳酸【（12．4-＋3．2）mmol／LVS（8．8±4．9）mmol／L,P=0．0311、APACHEII评分（34．6±6．1ws29．4±5．7,P=0．029）均明显高于人院时（P均〈0．05）,eTnI差异无统计学意义（P〉0．05）。存活组患者中．治疗6h[BNP：（1125．2＋563．3）pg／L vs（1947．2±l319．5）pgCL;eTnI：（2．1±1．4）ng／L vs（5．1＋4．4）nv4L;血孚L酸：（4．4±2．7）mmol／LVS（7．1±4．5）mmol／L;A．PACHEII评分：15．5±7．9vs22．1±8．81、24h]BNP：（578．1±345．5）pg／L vs（1947．2±l319．5）pz-／L;eTnI：（0．9±0．5）ng／L vs（5．1±4．4）ng／L;血乳酸：（2-4±1．3）mmol／Lvs（7．1±4．5）mmol／L;APACHEⅡ评分：10．4±2．8vs22．1±8．81各项指标均较入院时明显降低,差异有统计学意义（P均〈0．05）。结论BNP、eTnI、血乳酸和APACHEll评分可反映脓毒症休克患者心肌顿抑的严重程度,预测患者预后．进一步可据此建立相关的脓毒症休克患者心肌顿抑严重程度评估系统。