Diagnostic and prognostic utility of early measurement with high-sensitivity troponin T assay in patients presenting with chest pain

被引:69
|
作者
Aldous, Sally J. [1 ]
Richards, Mark [1 ,2 ]
Cullen, Louise [3 ]
Troughton, Richard [1 ]
Than, Martin [1 ]
机构
[1] Christchurch Hosp, Christchurch, New Zealand
[2] Natl Univ Hlth Syst, Cardiovasc Res Inst, Singapore, Singapore
[3] Royal Brisbane & Womens Hosp, Dept Emergency Med, Brisbane, Qld, Australia
关键词
ELEVATION MYOCARDIAL-INFARCTION; ACUTE CORONARY SYNDROMES; I ASSAY; RISK STRATIFICATION; AMERICAN-COLLEGE; NEXT-GENERATION; TASK-FORCE; GUIDELINES; MANAGEMENT; PERFORMANCE;
D O I
10.1503/cmaj.110773
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background: High-sensitivity troponin assays are now available for clinical use. We investigated whether early measurement with such an assay is superior to a conventional assay in the evaluation of acute coronary syndromes. Methods: Patients presenting to an emergency department with chest pain who did not have ST-segment elevation were prospectively recruited from November 2007 to December 2010. Patients underwent serial testing with a conventional cardiac troponin I assay. Samples were also obtained at presentation and two hours later for measurement of troponin T levels using a high-sensitivity assay. The primary outcome was diagnosis of myocardial infarction on admission; secondary outcomes were death, myocardial infarction and heart failure at one year. Results: Of the 939 patients enrolled in the study, 205 (21.8%) had myocardial infarction. By two hours after presentation, the high-sensitivity troponin T assay at the cut-off point of the 99th percentile of the general population (14 ng/L) had a sensitivity of 92.2% (95% confidence interval [CI] 88.1%-95.0%) and a specificity of 79.7% (95% CI 78.6%-80.5%) for the diagnosis of non-ST-segment myocardial infarction. The sensitivity of the assay at presentation was 100% among patients who presented four to six hours after symptom onset. By one year, the high-sensitivity troponin T assay was found to be superior than the conventional assay in predicting death (hazard ratio [HR] 5.4, 95% CI 2.7-10.7) and heart failure (HR 27.8, 95% CI 6.6-116.4), whereas the conventional assay was superior in predicting non fatal myocardial infarction (HR 4.0, 95% CI 2.4-6.7). Interpretation: The high-sensitivity troponin T assay at the cut-off point of the 99th percentile was highly sensitive for the diagnosis of myocardial infarction by two hours after presentation and had prognostic utility be yond that of the conventional assay. To rule out myocardial infarction, the optimal time to test a second sample using the high-sensitivity troponin T level may be four to six hours after symptom onset, but this finding needs verification in future studies before it can become routine practice.
引用
收藏
页码:E260 / E268
页数:9
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