心肌型脂肪酸结合蛋白检测在早期诊断STEMI中的价值

目的探讨心肌型脂肪酸结合蛋白（H-FABP）检测对ST段抬高型心肌梗死（STEMI）的早期诊断价值。方法对2008年1月～2009年1月收治的78例拟诊为STEMI患者,立即进行H-FABP、心肌肌钙蛋白I（cTnⅠ）、肌酸激酶同工酶-MB（CK-MB）、肌红蛋白（MYO）检测,比较其对STEMI早期诊断的敏感性、特异性。结果拟诊78例STEMI患者中,明确诊断为STEMI的69例。在胸痛症状发生3h内,H-FABP诊断STEMI的敏感度为85.5%,明显高于MYO（73.9%）、cTnⅠ（53.6%）和CK-MB（43.5%）,特异性为66.6%,高于MYO（44.4%）,低于cTnⅠ（100.0%）和CK-MB（77.7%）。结论 H-FABP检测诊断早期STEMI敏感度高,特异性较高,可作为检测STEMI早期心肌损伤的可靠标志物。     

四项指标联合检测对急性心肌梗死早期诊断价值的探讨

目的探讨心肌肌钙蛋白I(cTnI)、肌红蛋白(Myo)、肌酸激酶同工酶(CK-MB)以及超敏C-反应蛋白(hs-CRP)四项指标的联合检测在急性心肌梗死诊断中的临床应用价值。方法对40例急性心肌梗死患者(A组),35例不稳定型心绞痛患者(B组)和50例健康体检者(C组)在首诊(胸痛发作4 h之内)时进行cTnI、Mb、CK-MB和hs-CRP检测,比较它们各自及联合检测时对急性心肌梗死诊断的敏感性。结果急性心肌梗死患者血中cTnI、Myo、CK-MB和hs-CRP水平显著高于不稳定型心绞痛患者和对照组,差异有显著统计学意义(P<0.01),且急性心肌梗死患者血中cTn I、Myo、CK-MB和hs-CRP水平高于不稳定型心绞痛患者(P<0.05)。cTnI、Myo、CK-MB、hs-CRP及四项指标联合测定急性心肌梗死的阳性率分别为75%、82.5%、65%、87.5%和97.5%。结论 cTnI、Myo、CK-MB和hs-CRP对急性心肌梗死诊断有重要临床意义,联合检测可以提高急性心肌梗死诊断的灵敏度,具有较高临床价值。     

胸部钝挫伤患者心肌标志物水平的变化及其诊断意义

 目的 探讨胸部钝挫伤患者血清中心肌损伤标志物的动态变化规律及其对心肌损伤的诊断意义。方法 选择武警江苏总队医院住院治疗的胸部钝挫伤82例为观察组, 全部胸部钝挫伤患者(ISS≥16分)根据有无合并心肌损伤分为两组, 即合并心肌损伤组(A组), 无合并心肌损伤组(B组), 分别对两组患者伤后3 h、6 h、12 h、48 h血清肌钙蛋白Ⅰ(cTnI)、心肌特异脂肪酸结合蛋白(H-FABP)、肌红蛋白(Mb)进行检测, 同法测定60名健康体检者血清相应指标作为对照组。结果 两观察组在不同时段血清cTnI、H-FABP及Mb浓度均高于对照组, 其中A组在伤后6~48 h, cTnI、H-FABP浓度均明显高于B组, 差异有统计学意义(P<0.01)。同时段A、B两组Mb浓度虽均高于对照组, 但两组组间比较差异无统计学意义。结论 血清cTnI、H-FABP、Mb的动态变化与胸部钝挫伤患者病情严重程度、变化趋势及预后具有良好相关性, 对心肌损伤早期诊断、治疗具有重要意义。     

热性惊厥患儿血清cTnI和CK-MB的改变及临床意义

目的 探讨热性惊厥(FC)患儿血清心肌肌钙蛋白I(cTnI)和肌酸激酶同工酶(CK-MB)的改变及临床价值.方法 入院后24 h内检测98例热性惊厥(FC)患儿血清cTnI、CK-MB水平,同时选择48例有发热但无惊厥,并除外心肌炎、急性肌炎等疾病的患儿为对照组.结果 FC组血清cTnI和CK-MB水平明显高于对照组(P＜0.05).结论 FC患儿易合并心肌损害;血清cTnI、CK-MB的升高对早期发现心肌损害具有重要意义.     

心型脂肪酸结合蛋白在急性心肌梗死6h内的诊断价值

目的探讨心型脂肪酸结合蛋白(H-FABP)在急性心肌梗死(AMI)发病6 h内的诊断价值。方法将48例发病6 h内入院的AMI患者作为研究组,50例冠脉造影正常者入选对照组。采用双抗体夹心ELISA法定量检测血清H-FABP和肌钙蛋白(cTnⅠ)值,分别绘制两指标在AMI发病6 h内的特征曲线(ROC),比较曲线下面积(AUC)。并按推荐CUTOFF值计算敏感性、特异性。结果 6 h内H-FABP和cTnⅠ比较,AUC、敏感性差异有统计学意义(P<0.01)。结论 H-FABP用于AMI发病6 h内诊断的准确度高于cTnⅠ。     

血清心型脂肪酸结合蛋白对非ST段抬高急性冠脉综合征的诊断意义

目的探讨心型脂肪酸结合蛋白(H-FABP)对非ST段抬高急性冠脉综合征(non-ST-elevation acute coronary syndromes,NSTE ACS)的诊断意义。方法选择115例NSTE ACS患者和69例非心脏性胸痛患者(对照组),应用酶联免疫法测定H-FABP与心肌肌钙蛋白Ⅰ(c Tn I)水平,比较其在非ST段抬高急性心肌梗死(NSTE AMI),不稳定性心绞痛(UAP)及非心脏性胸痛患者3组人群中的差异。结果 NSTE ACS患者和对照组血清H-FABP水平分别为(459±312)pg/ml和(237±169)pg/ml,差异有统计学意义(P<0.05)。NSTE ACS组中,61例UAP患者H-FABP水平为(340±285)pg/ml,54例NSTE AMI患者为(592±289)pg/ml,差异有统计学意义(P<0.05)。对于胸痛发作后6 h内诊断NSTE AMI,H-FABP的ROC曲线下面积0.863,敏感性97.1%,特异性47.6%;c Tn I的ROC曲线下面积为0.799,敏感性为61.2%,特异性93.9%。结论 H-FABP是一个具有较高敏感性的早期NSTE ACS标志物,检测H-FABP有助于NSTE ACS诊断。     

心肌型脂肪酸结合蛋白与肌钙蛋白I联合检测对于急性心肌梗死的诊断价值评价

目的 探讨心肌型脂肪酸结合蛋白(H-FABP)与肌钙蛋白I(cTnI)联合检测对于急性心肌梗死(AMI)诊断的价值及H-FABP在增加心肌标志物组合诊断效能方面的作用.方法 以急诊就诊的急性胸痛症状患者133例为待研究人群,对每位患者入院第一管血血清H-FABP浓度及临床常用的心肌损伤标志物[cTnI,肌红蛋白(Myo)]进行定量检测,随后根据WHO标准将研究对象分为AMI患者(46例)与AMI疑似患者(87例).绘制3种标志物诊断AMI的受试者工作特征曲线(ROC曲线)并确定其最佳cutoff值,对设计出的3种诊断AMI的心肌标志物组合试验(cTnI+H-FABP、cTnI+Myo、cTnI+Myo+H-FABP)的诊断准确度指标进行比较.结果 根据ROC曲线确定的cTnI、Myo、H-FABP诊断AMI的cutoff值分别为0.5、90、5.7ng/ml,据此箅出的各心肌标物组合诊断AMI的灵敏度分别为(按cTnI+Myo、cTnI+H-FABP、cTnI+Myo+H-FABP的顺序)0.957、0.957、0.957,特异度分别为0.724、0.92、0.724,诊断符合率分别为0.805、0.932、0.805,其中cTnI+H-FABP组合的特异度及诊断符合率均明显高于cTnI+Myo和cTnI+Myo+H-FABP组合(P<0.05).结论 新建立的心肌标志物组合cTnI+H-FABP对AMI具有较高的诊断特异度和诊断符合率,在临床出现急性胸痛症状人群中诊断AMI的价值优于目前临床使用的心肌损伤标志物组合cTnI+Myo.     

心肌肌钙蛋白Ⅰ检测对诊断急性心肌梗死的价值

目的:比较心肌肌钙蛋白Ⅰ(CTnI)与肌酸激酶同工酶(CK-MB)诊断急性心肌梗死(AMI)的临床应用价值.方法:采用免疫放射分析法定量检测25例AMI和22例不稳定性心绞痛(UA)病人血清中CTnI和CK-MB,然后对两组病人检测CTnI和CK-MB的结果进行比较.结果:CTnI正常参考值按试剂盒说明定为＜0.1ng/ml,≥0.1ng/ml定为阳性(+).CK-MB正常参考值按试剂盒说明定为＜25U/l,≥25U/l为阳性(+).25例AMI病人CTnI均为阳性,CK-MB16例阳性,9例阴性(P＜0.01).22例UA病人CTnI仅一例阳性,其余阴性,CK-MB 5例阳性,17例阴性,(P＜0.05),CTnI诊断AMI的敏感性高于CK-MB(分别为100%和64.0%),CTnI诊断AMI的特异性高于CK-MB(分别为95.5%和77.3%).结论:检测CTnI对于AMI的诊断具有较高敏感性和特异性,是一种心肌损伤的特异性血清指标,具有较好的临床应用价值.     

脑钠肽、肌红蛋白及肌钙蛋白Ⅰ联合测定对早期诊断急性心肌梗死的临床意义

目的探讨急性心肌梗死(AMI)患者血浆脑钠肽(BNP),血清肌红蛋白(MYO),肌钙蛋白I(cTnI)的浓度变化及三者间的相关性,以探讨其对AMI的临床意义。方法采用化学免疫荧光法定量检测47例AMI患者入院后24 h内的BNP,MYO和cTnⅠ,并进行比较分析单个测定以及联合测定时诊断AMI的敏感性和特异性。结果 (1)AMI组BNP,MYO及cTnI的结果与健康对照组相比较,均有显著升高(P<0.05)。(2)在胸痛发作后2～6 h BNP,MYO,cTnI以及三项联合检测敏感性分别为76.2%,62.1%,74.2%,93.5%和特异性分别为79.2%,63.5%,82.7%,77.9%;在胸痛发作后6～12 h BNP,MYO,cTnI以及三项联合检测敏感性分别为89.5%,67.8%,83.5%,95.9%和特异性分别为84.3%,62.1%,88.3%,80.6%;在胸痛发作后12～24 h BNP,MYO,cTnI以及三项联合检测敏感性分别为94.7%,85.9%,92.6%,98.5%和特异性分别为97.6%,59.4%,96.5%,83.1%。结论 BNP,MYO及CTnI联合检测可以提高AMI检测的敏感性,有助于AMI早期诊断。     

力竭运动后不同时相大鼠心肌cTnI、Mb mRNA与血清cTnI、Mb表达

目的:观察力竭运动后大鼠心肌肌钙蛋白I(cTnI)、肌红蛋白(Mb)基因和血清cTnI、Mb水平变化,探讨运动性心肌微损伤的早期、特异性诊断指标与诊断方法.方法:80只SD大鼠,采用一次力竭游泳运动和2周反复力竭游泳运动建立运动性心肌微损伤大鼠动物模型,测定力竭运动后不同时相(4、12及24小时)血清cTnI和Mb含量及心肌cTnI、Mb mRNA表达.结果:(1)一次性力竭运动后各时相大鼠血清cTnI含量与对照组相比无显著性差异;运动后血清Mb含量显著升高,12～24小时恢复.(2)反复力竭运动后大鼠血清cTnI显著升高,运动后24小时仍未回落;血清Mb与对照组相比无显著性差异.(3)一次和反复力竭游泳运动后,大鼠心房肌和心室肌cTnI和Mb mRNA表达均呈下降趋势,其中心房肌cTnI、Mb tuRNA表达的下降趋势较心室肌明显.结论:(1)力竭运动后,血清Mb升高早、持续时间短;cTnI升高较晚,特异性强、持续时间长,联合检测血清cTnI和Mb有助于运动性心肌微损伤的早期、特异性诊断.(2)心房肌和心室肌cTnI基因、心房肌Mb基因在转录水平均以下调方式参与运动性心肌微损伤调控.(3)心房肌cTnI和Mb基因显著下调是心房易损伤的机制之一.     

H-FABP、NT-proBNP、cTnT和CK-MB在急性心肌梗死早期诊断中的价值比较

目的通过测定心型脂肪酸结合蛋白(H-FABP)、N-末端脑钠肽(NT-proBNP)、肌钙蛋白T(cTnT)和肌酸激酶同工酶(CK-MB)在急性心肌梗死(AMI)患者的早期诊断效率,对几种标志物在AMI早期诊断中的价值进行比较。方法测定84例AMI患者和72例不稳定型心绞痛(UA)患者血浆H-FABP、NT-proBNP、cTnT和CK-MB含量,各组之间进行比较,通过ROC曲线计算4种标志物在AMI早期诊断中的诊断效率、灵敏度、特异度和阴阳性预测值,比较几种标志物对AMI早期诊断价值。结果 AMI组的H-FABP、NT-proBNP、cTnT和CK-MB水平都明显高于UA组,两组比较,差异有统计学意义(P<0.05)。在AMI诊断上,H-FABP是4种标志物中诊断效率、灵敏度和阴性预测值最高的,cTnT是特异度和阳性预测值最高的,所有标志物诊断效率均具有统计学意义(P<0.01)。结论在AMI早期诊断上,4种标志物联合检测特别是H-FABP和cTnT联合检测能够明显提高AMI的诊断效率。     

Cardiac injury markers and a failed algorithm: can accurate assessment of acute myocardial infarction be cost effective?

CONTEXT: Most studies assessing the use of cardiac injury markers, such as cardiac troponin I (cTnI), total creatine kinase (CK Total), and the cardiac isoenzyme of CK (CK-MB), agree that cTnI is the most specific test for diagnosing acute myocardial infarction (AMI). However, throughout the literature, there are ambiguities and contradictions on assay-ordering criteria. Inconsistent ways of viewing biochemical assessment of acute chest pain leads to cardiac injury marker assay-ordering patterns that can be nonspecific, ambiguous, and costly. OBJECTIVE: This study set out to design a cost-effective strategy and to outline criteria for ordering cardiac injury marker assays. This is accomplished by comparing Madigan Army Medical Center (MAMC) testing patterns to guidelines described in recently published prospective hospital studies investigating the markers. DESIGN: This was a retrospective study analyzing the patterns of 34,412 cardiac marker assays performed on 4,861 patients during 1999 and 2000 at MAMC. A total of 5,850 assays were run from 1,223 patients during the first 6 months of 2001. RESULTS: The MAMC chemistry section spent more than $100,000 during 1999 for the measurement of cardiac injury markers. During 2000, an algorithm was implemented to place controls on ordering; however, the same dollar amount was spent. CK Total, CK-MB, and cTnI testing represent 3.5% of the tests performed in the chemistry section, but they consumed about 20% of the supply budget. This disproportionate expenditure is attributable to numerous, dissimilar, and voluminous ordering patterns. CONCLUSIONS: Proper use of cardiac marker assays can lead to rapid and accurate diagnosis of AMI and subsequently save lives. This study demonstrates that cTnI is the only marker needed for accurate and more cost-effective assessment of AMI.     

心肌肌钙蛋白Ⅰ对心肌损伤的诊断价值

目的　探讨心肌肌钙蛋白Ⅰ (cTnI)对心肌损伤的诊断和鉴别诊断价值。方法　对 1 5例确诊急性心肌梗死 (AMI)和 1 5例诊断明确的单纯肌酸磷酸激酶 (CK)增高无心肌损伤患者同一份血样分别行cTnI和CK、肌酸磷酸激酶同功酶(CK MB)测定。结果　cTnI在AMI组阳性率为 1 0 0 % ,对照组阳性为 0 ,两组差异非常显著 (P <0 .0 0 1 )。CK MB在AMI阳性率为 93 3 % ,对照组阳性率为 80 % ,两组相比无显著差异。结论　cTnI对心肌损伤具有很重要的诊断价值。     

Postmortem cardiac troponin I and creatine kinase MB levels in the blood and pericardial fluid as markers of myocardial damage in medicolegal autopsy

The present study investigated cardiac troponin I (cTnI) and creatine kinase MB (CK-MB) in the blood and pericardial fluid from medicolegal autopsy cases (n=234, within 48h postmortem) with regard to the cause of death. The cTnI and CK-MB levels in cardiac, peripheral blood and pericardial fluid generally showed a mild and gradual postmortem time-dependent elevation (r=0.231-0.449, P<0.05-0.001). However, postmortem elevation of cTnI was larger for specific causes of death including acute myocardial infarction (AMI), cerebrovascular diseases (CVD), hyperthermia, fatal methamphetamine (MA) abuse and carbon monoxide (CO) intoxication and insignificant for recurrent myocardial infarction (RMI), chronic congestive heart diseases (CHD) and drowning, while that of CK-MB was greater for CO intoxication and insignificant for drowning. Cardiac blood and pericardial cTnI levels were relatively high for AMI, RMI, hyperthermia, MA abuse and CO intoxication, and was low for drowning. Elevated CK-MB level was observed for cardiac blood in asphyxiation and MA abuse cases and for peripheral blood in hyperthermia and MA abuse cases. When the cTnI/CK-MB ratio was estimated, it was independent of postmortem time, and the ratios for cardiac blood and pericardial fluid were significantly higher in cases of AMI, RMI, hyperthermia and CO intoxication but lower in cases of drowning. Elevations of cTnI levels in cardiac blood and pericardial fluid were related to the morphological severity of myocardial damage. These findings suggest that elevated cTnI and CK-MB levels in blood and pericardial fluid are related to ischemic, hypoxic and/or cytotoxic myocardial damage, which are characteristic of the cause of death, although the levels increase after death depending on myocardial damage at the time of death.     

Heart-type fatty acid binding protein and cardiac troponin I may have a diagnostic value in electrocution: A rat model

Although cardiac injury is known to be the leading cause of death in electrocution, the differential diagnosis can be challenging in forensic practice since the exact mechanism is poorly understood and there is lack of reliable markers. Thus, death due to electrocution may be classified as a negative autopsy. The serum levels of and myocardial immunostaining loss for cardiac troponins and heart-type fatty acid binding protein (H-FABP) are highly sensitive and specific biomarkers of ischemic myocardial damage and may have a diagnostic value in determining the myocardial injury or the cause of death due to electrocution. Due to this reason, a rat model is prepared to investigate these issues. Thirty-two Wistar albino female rats were included and randomly divided into four groups of eight subjects. Group A was the control group, and Group B, C, and D were exposed to electrical current of 110 volt (V), 220 V, and 600 V, respectively. Blood samples and the hearts were collected from the rats for biochemical and immunostaining analyses.It is found that increased serum H-FABP levels were significantly associated with the higher voltage immediately after electrocution. However, serum cardiac troponin I (cTnI) levels did not show significant changes associated with the higher voltage in the early period of electrocution. As for histopathological examinations, the only significant difference in myocardial immunostaining loss was for H-FABP in Group B.Serum H-FABP levels may have a diagnostic value in the early postmortem period immediately after electrocution. Besides, it seems that serum H-FABP levels may be a better indicator than those of cTnI to reflect the myocardial damage in the early period of the electrocution.