A rapid troponin I assay is not optimal for determination of troponin status and prediction of subsequent cardiac events at suspicion of unstable coronary syndromes

2004 ◽  
Vol 93 (2-3) ◽  
pp. 113-120 ◽  
Author(s):  
Stefan K. James ◽  
Bertil Lindahl ◽  
Paul Armstrong ◽  
Robert Califf ◽  
Maarten L. Simoons ◽  
...  
2011 ◽  
Vol 57 (12) ◽  
pp. 1762-1770 ◽  
Author(s):  
Stephen J Nicholls ◽  
WH Wilson Tang ◽  
Danielle Brennan ◽  
Marie-Luise Brennan ◽  
Shirley Mann ◽  
...  

BACKGROUND Although myeloperoxidase (MPO) monitoring is predictive for cardiovascular outcomes in suspected acute coronary syndromes, the value of serial testing is unknown. METHODS We investigated the relationship between serial MPO concentrations in 490 individuals with acute chest pain and incident major adverse cardiac events (MACE) during 6 months of follow-up. We measured MPO with the CardioMPO assay, and cardiac troponin I (cTnI), with the Abbott Architect assay. RESULTS Plasma MPO concentrations during the first 16 h were higher in individuals who experienced MACE. Higher MPO quartiles predicted a greater likelihood of 6-month MACE at baseline [OR (95% CI), 2.4 (1.4–4.1), P = 0.001 for highest vs lowest quartile] and all subsequent time points, with strongest predictive ability found in 16-h postbaseline samples [9.9 (4.7–20.9), P < 0.001 for highest vs lowest quartile]. MPO was predictive for MACE among individuals whose cTnI remained within reference intervals (<0.028 μg/L). The lowest rate of missed cases was found when MPO was <640 pmol/L at baseline and all other time points. Serial MPO monitoring predicted MACE risk better than baseline MPO measurements alone (c statistic 0.813 vs 0.602; P = 0.002), including in individuals whose cTnI remained within reference intervals (c statistic 0.903; P = 0.009). Combined serial cTnI and MPO testing improved accuracy for predicting 6-month MACE, reduced the number of missed MACE events from cTnI testing alone, and improved risk classification in 26.1% of patients. CONCLUSIONS MPO concentrations are predictive of outcome up to 16 h after presentation with chest pain and predict events missed by cTnI testing, supporting a potential role in rapid patient triage.


Author(s):  
Paul O Collinson ◽  
Nigel Wiggins ◽  
David C Gaze

All patients admitted to the coronary care unit with suspected acute coronary syndromes were evaluated by serial electrocardiography and blood draws on admission and at 4 and 12h from admission. Diagnosis was based on conventional WHO criteria. Samples were measured for creatine kinase (CK), cardiac troponin T (cTnT), myoglobin, CK isoenzyme MB (CK-MB) and cardiac troponin I (cTnI). A set of samples from individuals undergoing extreme endurance training was also examined. Analytical imprecision was consistent with published quality goals. Samples were stable for cTnI under a range of storage conditions, including multiple freeze-thaw cycles. CK-MB, cTnI and cTnT were equally efficient for the diagnosis of acute myocardial infarction, irrespective of the final diagnostic criteria used. Both cTnI and cTnT were of equal efficiency in the identification of a high-risk subgroup of patients with unstable angina. Significant elevations of cTnI were not seen in an endurance-training group.


Author(s):  
Luiz Tanajura ◽  
José Costa Júnior ◽  
Áurea Chaves ◽  
Marinella Centemero ◽  
Fausto Feres

Acute coronary syndromes are common situations in medical practice, with high morbidity and mortality. Consequent to its relevance, its clinical management has always been subject of discussion and controversy. Since the past decade, the dual antiplatelet regimen has been the main therapeutic option used in its passivation, whereas percutaneous interventions have become the most common therapeutic option. Clopidogrel, the drug initially used in combination with aspirin, is effective and safe; however, it has disadvantages that led to the development of a new generation of more efficient antiplatelet drugs, such as prasugrel and ticagrelor. In large comparative clinical trials, these two drugs proved superior to clopidogrel in reducing major combined cardiac events. Hence the main guidelines currently support the two new agents, which are considered first-line drugs. Due to the clear differences between the protocols of clinical trials corroborating their inclusion in clinical practice, it is not possible to make direct comparison without the risk of generating hasty impressions. More recently, a large prospective, randomized clinical trial provided an appropriate head-to-head comparison between prasugrel and ticagrelor in cases of acute coronary disease, in a population submitted to invasive treatment. The study demonstrated a significant advantage of prasugrel. In this review, we discuss the primary details of these more contemporary drugs and the most relevant clinical trials related to them, identifying the advantages and disadvantages of each agent. At the end, we state our view on their current prescription.


2020 ◽  
Vol 36 (6) ◽  
Author(s):  
Kulsoom Bahadur ◽  
Aamir Ijaz ◽  
Momin Salahuddin ◽  
Aftab Alam

Objective: This study aims to establish the 99th percentile upper reference limits of high sensitive cardiac troponin I in a healthy Pakistani population. Methods: It was an Observational cohort study carried out in Department of Chemical Pathology and Endocrinology Rehman Medical Institute Peshawar, over the period of one year (January 2019- December 2019). Total 299 cardio-healthy males and females were interviewed and taken past medical history. Based on history, clinical examination, echocardiogram and laboratory data including results of estimated glomerular filtration rate (eGFR) and N-terminal pro-B-type natriureteric peptide (NT-proBNP), subjects with possible subclinical diseases were excluded. High Sensitive Cardiac Troponin I (hs-cTtrop I) was analysed on Abbot ARCHITECT STAT ci8200 using chemiluminescent immunoassay technique. The 99th percentile upper reference limit (URL) of hs-cTtrop I was determined using a non-parametric statistic, while gender specific results were compared. Results: In this study, 178 males (59.5%) and 121 females (40.5%) were included. The median Interquartile ranges (IQR) of age was 57 (11.6) for males and 56 (13) for females. The 99th percentile URL hs-cTtrop I was found to be 33.9 ng/L, while gender specific values were 38.41ng/L and 15.73ng/L for males and females, respectively (p= 0.0045). Conclusion: High sensitivity cardiac troponin I 99th percentile URL in our study population was found to be 33.9 ng/L with gender specific values being 38.41 ng/L and 15.73ng/L for males and females respectively. Troponin I in males was substantially high in comparison with females. doi: https://doi.org/10.12669/pjms.36.6.2328 How to cite this:Bahadur K, Ijaz A, Salahuddin M, Alam A. Determination of high sensitive cardiac troponin I 99th percentile upper reference limits in a healthy Pakistani population. Pak J Med Sci. 2020;36(6):---------. doi: https://doi.org/10.12669/pjms.36.6.2328 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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