The prognostic use of serum concentrations of cardiac troponin-I,CK-MB and myoglobin in patients with idiopathic dilated cardiomyopathy

Objective

To examine the association between survival and serum concentrations of cTnI, CK-MB, and myoglobin in patients with idiopathic dilated cardiomyopathy (IDC).

Background

It has been suggested that elevated circulating biomarkers of myocardial damage such as cardiac troponin-I (cTnI), creatine kinase MB (CK-MB) and myoglobin are independent risk factors for mortality in patients with heart failure, and recent studies, although limited, showed that there was a potential association between cTnI and the prognosis of patients with dilated cardiomyopathy (DCM).

Methods

A cohort study was undertaken in 310 patients with IDC. Standard demographic information, transthoracic echocardiography, and routine blood tests were obtained shortly after hospital admission. Outcome was assessed with all-cause mortality.

Results

Among the 310 patients studied, 61 (19.7%) died during a mean follow-up of 2.2 years. There was a significant difference in the all-cause mortality rate between patients with serum cTnI >0.05 ng/mL and with cTnI ≤0.05 ng/mL (37.5% vs 15%, log-rank χ² = 18.423, P < 0.001). After adjustment for other factors associated with prognosis at baseline, serum cTnI >0.05 ng/mL, QRS duration, NYHA functional class and systolic blood pressure predicted all-cause mortality in patients with IDC. There was no association between circulating CK-MB and myoglobin levels and all-cause mortality in the studied IDC patients.

Conclusion

Serum concentrations of cTnI but not CK-MB or myoglobin are an independent predictor of all-cause mortality in patients with IDC.     

围体外循环期肌钙蛋白Ⅰ的临床研究——判断心肌保护的一个新指标

目的探讨先天性心脏病(先心病)矫治术中心脏不停跳与心脏停跳两种术式对肌钙蛋白I(cTn-I)的影响,阐明cTn-I是判断不同术式心肌保护效果的一个新指标.方法36例先心病矫治术患者随机分为两组,冷晶体停跳组(组Ⅰ),心脏不停跳组(组Ⅱ).分别于各时段抽血,测定cTn-I、肌酸激酶(CK)、肌酸激酶同工酶(CK-MB)、乳酸脱氢酶(LDH).同时行电镜观察手术前后心肌超微结构变化.结果术后各时点组ⅠcTn-I明显高于组Ⅱ(P＜0.05);组Ⅰ CK-MB、CK、LDH明显高于组Ⅱ(P＜0.05).电镜观察组Ⅱ术后心肌超微结构无明显变化,而组Ⅰ受损程度分级与术前比较差异有显著性.结论先心病矫治术中心脏不停跳明显减轻了心肌缺血缺氧及再灌注损伤,减少了cTn-I的释放,较冷晶体停跳术有良好的心肌保护效果.肌钙蛋白I是判断心肌保护效果的一个灵敏的新指标.     

骨髓干细胞动员剂对大鼠急性心肌梗死肌钙蛋白Ⅰ的影响

目的:探讨粒细胞集落刺激因子动员骨髓干细胞,对大鼠急性心肌梗死肌钙蛋白I的影响。方法:把20只大 鼠随机分为两组:对照组及试验组,每只大鼠均于24 h,7 d采血,测定心肌肌钙蛋白I的水平。结果:实验组心肌肌钙蛋白 I在24 h,7 d较对照组均显著下降(P<0.05),有统计学意义。结论:粒细胞集落刺激因子通过动员骨髓干细胞,迁移到 心肌,修复受损的心肌,减少心肌肌钙蛋白I的释放。     

Is general anesthesia a risk for myocardium? Effect of anesthesia on myocardial function as assessed by cardiac troponin-i in two different groups (isofluran+N2O inhalation and propofol+fentanyl iv anesthesia)

Background and objectives

Peroperative myocardial infarction (MI) is the most common cause of morbidity and mortality. What is the role of general anesthesia in this process? Is general anesthesia a risk for myocardial infarction? The present study was designed to determine whether the measurement of serum levels of cardiac troponin I (cTnI), a highly sensitive and specific marker for cardiac injury, would help establish the diagnosis of myocardial infarction in two different types of anesthesia.

Method

Elective abdominal hysterectomy was planned with the permission of the ethic committee in 40 patients who were 20–45 years range, in ASA-I group, and have a Goldman Cardiac Risk Index-0. The patients were divided into two groups. Isoflurane + N₂O was administrated to first group, and Propofol + Fentanyl to second group. cTnI levels were determined before anesthesia, after induction before surgery and 9 hours after the second period respectively.

Results

There was no significant difference between the groups by the means of demographic properties, hemodynamic parameters and cTnI levels, and the cTnI levels were determined under the basal levels in all samples.

Conclusion

General anesthesia is not a risk for myocardial infarction to state eliminating risk factors and protection hemodynamia cardiac.     

Effects of metoprolol therapy on cardiac troponin-I levels after elective percutaneous coronary interventions.

AIMS: Beta-blockers (BBs) have been shown to improve survival and reduce the risk of re-infarction in patients following myocardial infarction. There are conflicting data about the effects of BB therapy on cardiac biomarkers after percutaneous coronary interventions (PCIs). The aim of the study was to investigate the effects of BB use on cardiac troponin-I (cTnI) levels in patients who had undergone elective PCI. METHODS AND RESULTS: In this prospective study, 287 patients with coronary artery disease were included. Patients were randomized either to BB or control groups prior to the intervention. Blood samples for cTnI were obtained before and at 6, 24, and 36 h after the procedure. Of the 287 patients included, 143 received metoprolol succinate 100 mg/day, and 144 received no BB and served as the control group. Baseline clinical characteristics of both groups, except for history of coronary artery bypass graft surgery, were similar. We observed no significant difference in the elevation of cTnI levels between the two groups after PCI (BB group, 17 patients, 11.9%; control group, 10 patients, 6.9%; P=0.2). CONCLUSION: Metoprolol succinate therapy seems to have no cardioprotective effect in limiting troponin-I rise after PCI.     

体外循环中微温血、冷血心肌保护液对心肌保护作用的比较

目的观察微温血与冷血心肌保护液对瓣膜置换术患者的心肌保护作用。方法30例行二尖瓣或主动脉瓣置换术者随机分为两组,分别经主动脉根部每20～30min间断顺行灌注微温血或冷血心肌保护液。主动脉阻断前、体外循环结束后6h、16h分别测血气分析、磷酸肌酸激酶同工酶(CK-MB)、心肌钙蛋白-I(cTn-I)。结果主动脉阻断前血气、CK-MB、cTn-I两组无显著差异,体外循环结束后6h、16h微温血组较冷血组各项指标低有显著差异。结论微温血较冷血心肌保护液对二尖瓣置换术者缺血再灌注心肌功能有显著保护作用。     

血浆生物标志物测定对早期诊断ACS患者的临床分析

目的:为了探讨血浆生物标志物对早期诊断急性冠状动脉综合征(ACS)患者的临床分析.方法:108例ACS患者[包括42例AMI和66例不稳定型心绞痛(UAP)患者]、32例稳定型心绞痛(SAP)和42例正常对照组,利用荧光免疫分析血浆中N-末端脑钠肽前体(NT-proBNP)水平,超敏免疫比浊法测定了血浆超敏C-反应蛋白...     

急性心肌梗死患者经皮冠状动脉介入治疗后尿水通道蛋白-2的变化及意义

目的研究急性心肌梗死经皮冠状动脉介入（percutaneous coronary intervention,PCI）治疗后尿水通道蛋白-2（aquaporin-2,AQP2）的变化,探讨AQP2与心肌细胞水肿的关系。方法选择80例急性心肌梗死患者,分组检验治疗前、后尿AQP2不同时段浓度,同时检测血清肌钙蛋白-I、B型脑钠肽浓度。分析AQP2与肌钙蛋白-I、B型脑钠肽的相关性。结果心肌梗死组尿AQP2浓度明显高于正常对照组,差异有统计学意义（P〈0．05）。早期再灌注治疗能显著降低尿AQP2浓度,差异有统计学意义（P〈0．01）。急诊PCI治疗亚组较尿激酶亚组更能降低尿AQP2浓度,差异有统计学意义（P〈0．05）。心肌梗死后血清肌钙蛋白-I（r=0．89,P〈0．03）、B型脑钠肽浓度（r=0．78,P〈0．05）与AQP2显著正相关。结论急性心肌梗死后尿AQP2浓度明显升高,PCI治疗能显著降低尿AQP2浓度。AQP2与心肌坏死指标和心力衰竭指标相关性高,可能参与急性心肌梗死后心力衰竭的发生、发展。     

Comparison of serum cardiac specific troponin-I with creatine kinase,creatine kinase-MB isoenzyme,tropomyosin, myoglobin and C-reactive protein release in marathon runners: cardiac or skeletal muscle trauma?

Problems arise in distinguishing skeletal from cardiac muscle trauma on the basis of serum enzyme tests following severe muscle exercise. The contributions of cardiac and skeletal sources have been assessed in eleven marathon runners by measuring pre- and post-race serum levels of cardiac-specific myofibrillar troponin-I together with total creatine kinase, creatine kinase-MB isoenzyme, myoglobin, myofibrillar tropomyosin and C-reactive protein. Total creatine kinase, creatine kinase-MB isoenzyme, tropomyosin and myoglobin were significantly elevated above pre-race levels in all runners between 1 h and 128 h post-race. Neither mean cardiac troponin-I nor C-reactive protein was elevated post-race. Nine out of sixty-three samples fulfilled conventional positive criteria for cardiac muscle damage on the basis of combined creatine kinase and creatine kinase-MB isoenzyme levels. Six runners had one or more positive samples. No samples had levels above twice the upper normal limit for either cardiac troponin-I or C-reactive protein. Correlation analysis of levels in each sample indicated skeletal and not cardiac muscle as the source of raised serum protein.