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High sensitive troponin I

Nourdine Chakouri, Cyril Reboul, Doria Boulghobra, Adrien Kleindienst, Stéphane Nottin, Sandrine Gayrard, François Roubille, Stefan Matecki, Alain Lacampagne, Olivier Cazorla
BACKGROUND: The interplay between oxidative stress and other signaling pathways in the contractile machinery regulation during cardiac stress and its consequences on cardiac function remains poorly understood. We evaluated the effect of the crosstalk between β-adrenergic and redox signaling on post-translational modifications of sarcomeric regulatory proteins, Myosin Binding Protein-C (MyBP-C) and Troponin I (TnI). METHODS AND RESULTS: We mimicked in vitro high level of physiological cardiac stress by forcing rat hearts to produce high levels of oxidized glutathione...
May 1, 2018: International Journal of Cardiology
Ni Zhu, Bing Yi, Zhifu Guo, Guanxin Zhang, Shengdong Huang, Yongwen Qin, Xianxian Zhao, Jianxin Sun
BACKGROUND/AIMS: Pim-1 is a serine/threonine kinase that is highly expressed in the heart, and exerts potent cardiac protective effects through enhancing survival, proliferation, and regeneration of cardiomyocytes. Its myocardial specific substrates, however, remain unknown. In the present study, we aim to investigate whether Pim-1 modulates myofilament activity through phosphorylation of cardiac troponin I (cTnI), a key component in regulating myofilament function in the heart. METHODS: Coimmunoprecipitation and immunofluorescent assays were employed to investigate the interaction of Pim-1 with cTnI in cardiomyocytes...
March 10, 2018: Cellular Physiology and Biochemistry
Hector Cubero-Gallego, Maria Heredia-Rodriguez, Eduardo Tamayo
We aimed to assess the influence of impairment in renal function over the high-sensitivity cardiac troponin T (hs-cTnT) accuracy to diagnose perioperative myocardial infarction (MI) after heart valve surgery. Heart valve surgery was performed in 805 patients from June 2012 to January 2016. Patients with enzymatic curves of hs-cTnT suggestive of myocardial necrosis and electrocardiogram and/or transthoracic echocardiogram criteria were identified as patients with perioperative MI. Impairment in renal function was defined as a postoperative creatinine clearance <50 ml/min at 16 h after surgery and for at least 48 h...
March 12, 2018: Interactive Cardiovascular and Thoracic Surgery
Peter A Kavsak, Paul Malinowski, Chantele Roy, Lorna Clark, Shana Lamers
BACKGROUND: Analytical evaluation of high-sensitivity cardiac troponin (hs-cTn) assays, with particular attention to imprecision, interferences and matrix effects, at normal cTn concentrations, is of utmost importance as many different clinical algorithms use concentration cutoffs <10 ng/L for decision-making. The objective for the present analytical study was to compare the new Beckman Coulter hs-cTnI assay (Access hsTnI) to Abbott's hs-cTnI assay in different matrices and for different interferences, with a focus on concentrations <10 ng/L...
March 13, 2018: Clinical Chemistry and Laboratory Medicine: CCLM
Cian P McCarthy, Nasrien E Ibrahim, Asya Lyass, Yiwei Li, Hanna K Gaggin, Mandy L Simon, Renata Mukai, Parul Gandhi, Noreen Kelly, Shweta R Motiwala, Roland R J van Kimmenade, Joseph M Massaro, Ralph B D'Agostino, James L Januzzi
BACKGROUND: The meaning of high-sensitivity troponin I (hsTnI) concentrations in patients without acute myocardial infarction (MI) requires clarity. We hypothesized that among patients referred for diagnostic coronary angiography without acute MI, hsTnI concentrations would correlate with prevalent coronary artery disease (CAD) and predict incident cardiovascular events and mortality. METHODS AND RESULTS: We measured hsTnI using a single-molecule counting assay (99th percentile, 6 ng/L) in samples from 991 patients obtained at the time of angiography...
March 8, 2018: Journal of the American Heart Association
Thomas Krysztofiak, John Byrne
High-sensitivity cardiac troponin assays have emerged as a powerful tool in the management of patients presenting acutely to hospital with suspected cardiac chest pain. Recent guidelines emphasize the reassurance offered by low troponin concentrations early after admission. We describe a patient with known coronary artery disease, who presented with a classical history of recurrent myocardial ischaemia. High-sensitivity cardiac Troponin-I concentrations remained in the low-normal sex-specific reference range, despite serial testing on the day of admission, and despite recurrent pain with dynamic ECG changes...
January 1, 2018: Scottish Medical Journal
Fjola D Sigurdardottir, Magnus N Lyngbakken, Oddgeir L Holmen, Håvard Dalen, Kristian Hveem, Helge Røsjø, Torbjørn Omland
C-reactive protein and cardiac troponin I measured with high-sensitivity assays (high-sensitivity C-reactive protein [hs-CRP] and high-sensitivity troponin I [hs-TnI]) have been associated with risk of fatal and nonfatal cardiovascular events in the general population. The relative prognostic merits of hs-CRP and hs-TnI, and whether these markers of inflammation and subclinical myocardial injury provide incremental information to established cardiovascular risk prediction models, remain unclear. hs-CRP and hs-TnI were measured in 9,005 participants from the prospective observational Nord-Trøndelag Health (HUNT) study...
February 2, 2018: American Journal of Cardiology
C P Ma, X L Liu, Q S Wang, S P Nie
Objective: To develop and prospectively validate a risk score for acute chest pain patients with normal high-sensitivity troponin I (hs-TnI) levels and without obvious ST-segment deviation in China. Methods: Chest pain patients admitted to the emergency department of Beijing Anzhen Hospital from September 2014 to July 2015 were enrolled. Baseline characteristics of patients met inclusion criteria including normal hs-TnI levels and without obvious ST-segment deviation were included. The endpoint (major adverse cardiovascular events) was a composite of acute myocardial infarction, percutaneous coronary intervention, coronary artery bypass graft, and all-cause death within 3 months after initial presentation...
February 24, 2018: Zhonghua Xin Xue Guan Bing za Zhi
Ásthildur Árnadóttir, Kirstine Roll Vestergaard, Jannik Pallisgaard, György Sölétormos, Rolf Steffensen, Jens P Goetze, Kasper Iversen
BACKGROUND: Differences in prevalence and prognostic information of cardiac troponin T (cTnT) and I (cTnI) concentrations in patients without acute coronary syndrome (ACS) are insufficiently investigated. High-sensitivity assays (hs-cTn) have led to an increased interest in hs-cTn for risk stratification. Here, we compare hs-cTnT and hs-cTnI in prediction of mortality patients without ACS. METHOD AND RESULTS: Patients aged >18 years, consecutively admitted to an emergency department (ED) were included...
February 4, 2018: International Journal of Cardiology
Ayman Samman Tahhan, Pratik Sandesara, Salim S Hayek, Muhammad Hammadah, Ayman Alkhoder, Heval M Kelli, Matthew Topel, Wesley T O'Neal, Nima Ghasemzadeh, Yi-An Ko, Mohamad Mazen Gafeer, Naser Abdelhadi, Fahad Choudhary, Keyur Patel, Agim Beshiri, Gillian Murtagh, Jonathan Kim, Peter Wilson, Leslee Shaw, Viola Vaccarino, Stephen E Epstein, Laurence Sperling, Arshed A Quyyumi
BACKGROUND: The associations between high-sensitivity troponin I (hsTnI) levels and coronary artery disease (CAD) severity and progression remain unclear. We investigated whether there is an association between hsTnI and angiographic severity and progression of CAD and whether the predictive value of hsTnI level for incident cardiovascular outcomes is independent of CAD severity. METHODS AND RESULTS: In 3087 patients (aged 63±12 years, 64% men) undergoing cardiac catheterization without evidence of acute myocardial infarction, the severity of CAD was calculated by the number of major coronary arteries with ≥50% stenosis and the Gensini score...
February 21, 2018: Journal of the American Heart Association
Tom Kai Ming Wang, Clementina Dugo, Yvonne Gillian, Wynne Yvonne, Semple Heather, Smith Kevin, Cleave Peter, Christiansen Jonathan, To Andrew, Amir Nezar, Tony Scott, Boswell Ross, Gladding Patrick
The conventional use of high-sensitivity troponins (hs-troponins) is for diagnosing myocardial infarction however they also have a role in chronic disease management. This pilot study assessed the relationship of hs-troponins with echocardiographic markers of left ventricular hypertrophy (LVH) and structural heart disease (SHD). Patients undergoing computer gomography (CT) coronary angiogram for low-intermediate risk chest pain and healthy volunteers were recruited. Hs-troponins Singulex I, Abbott I and Roche T and N-terminal pro-brain natriuretic peptide (NT-proBNP) were evaluated in relation to SHD parameters including left ventricular hypertrophy (LVHEcho ) and left atrial enlargement (LAEEcho ) on echocardiography...
February 15, 2018: Medical Sciences: Open Access Journal
Michèle Natale, Michael Behnes, Seung-Hyun Kim, Julia Hofmann, Nadine Reckord, Ursula Hofmann, Johannes Budjan, Siegfried Lang, Martin Borggrefe, Theano Papavassiliu, Thomas Bertsch, Ibrahim Akin
Following publication of the original article [1], the authors reported that there was a mistake in the Methods section → Measurements of biomarkers (page 6, line 3): 2000g should read 2500g. So, the correct sentence should be "All samples were obtained by venipuncture into serum monovettes® and centrifuged at 2500g for 10 min at 20 °C."
February 19, 2018: European Journal of Medical Research
Xia Yang, Yan-Qing Yu, Ling-Zhi Peng, Yan-Mei Lei, Ya-Qin Chai, Ruo Yuan, Ying Zhuo
Sensitive and feasible electrochemiluminescence (ECL) bioassay relies on the achievement of the ECL signal tags with high and stable signal intensity. In this work, strong electrochemiluminescence (ECL) emission was achieved from metal organic framework (MOFs) accelerator enriched Quantum Dots (CdTe), which was applied as an efficient ECL signal tag for trace biomarker detection. It is particularly worth noting that a novel mechanism to drastically enhance the ECL intensity of CdTe is established because the isoreticular metal organic framework-3 (IRMOF-3) with 2-amino terephthalic acid (2-NH2-BDC) as organic ligand is not only devoted for loading large amount of CdTe via encapsulating effect and internal/external decoration, but also as a novel co-reactant accelerator for promoting the conversion of co-reactant S2O82- into the sulfate radical anion (SO4•-), further boosting the electrochemiluminescence (ECL) emission of CdTe...
February 19, 2018: Analytical Chemistry
Tingting Bai, Meng Wang, Min Cao, Juan Zhang, Kangzhen Zhang, Ping Zhou, Zhengxia Liu, Ying Liu, Zhirui Guo, Xiang Lu
Lateral flow assay strips (LFASs) with Au nanoparticles (NPs) have been widely used as a probe for biomarkers in point-of-care testing; however, there still remain challenges in detection sensitivity and quantitative analysis. In this study, we developed a surface-enhanced Raman scattering (SERS)-based LFAS for quantitative analysis of a biomarker in the low concentration range. Moreover, apart from conventional Au NPs, three other types of citrate-capped Au-Ag bimetallic NPs: Au core with Ag shell NPs (Au@Ag NPs), rattle-like Au core in Ag-Au shell NPs (Au@Ag-Au NPs) and Ag-Au NPs were prepared and functionalized, and their solution-based SERS activities were comprehensively studied by experimental measurement and theoretical analysis...
February 14, 2018: Analytical and Bioanalytical Chemistry
Philip D Adamson, Amanda Hunter, Debbie M Madsen, Anoop S V Shah, David A McAllister, Tania A Pawade, Michelle C Williams, Colin Berry, Nicholas A Boon, Marcus Flather, John Forbes, Scott McLean, Giles Roditi, Adam D Timmis, Edwin J R van Beek, Marc R Dweck, Hans Mickley, Nicholas L Mills, David E Newby
BACKGROUND: We determined whether high-sensitivity cardiac troponin I can improve the estimation of the pretest probability for obstructive coronary artery disease (CAD) in patients with suspected stable angina. METHODS AND RESULTS: In a prespecified substudy of the SCOT-HEART trial (Scottish Computed Tomography of the Heart), plasma cardiac troponin was measured using a high-sensitivity single-molecule counting assay in 943 adults with suspected stable angina who had undergone coronary computed tomographic angiography...
February 2018: Circulation. Cardiovascular Quality and Outcomes
Robert Zymliński, Jan Biegus, Mateusz Sokolski, Paweł Siwołowski, Sylwia Nawrocka-Millward, John Todd, Ewa A Jankowska, Waldemar Banasiak, Gad Cotter, John G Cleland, Piotr Ponikowski
AIMS: Lactate is produced by anaerobic metabolism and may reflect inadequate tissue perfusion in conditions such as acute heart failure (AHF). We evaluated the prevalence and clinical significance of elevated blood lactate on admission in patients with AHF. METHODS AND RESULTS: We enrolled 237 patients with AHF (mean age 67 ± 12 years; 70% men) presenting without overt clinical evidence of peripheral hypoperfusion ('warm haemodynamic profile'). Median (upper and lower quartiles) blood lactate on admission was 1...
February 12, 2018: European Journal of Heart Failure
Kasper Glerup Lauridsen, Anders Sjørslev Schmidt, Kasper Adelborg, Leif Bach, Nete Hornung, Simon Munkesø Jepsen, Charles D Deakin, Hans Rickers, Bo Løfgren
Oxygen has long been assumed beneficial for all ill and injured patients. However, hyperoxia may be harmful and aggravate myocardial injury such as that caused by myocardial infarction. We aimed to investigate if hyperoxia increases myocardial injury following direct current cardioversion compared with room air. METHODS: Patients undergoing elective biphasic cardioversion for atrial fibrillation or atrial flutter were randomized to receive room air or oxygen (10-15 L/min) during the procedure...
February 2018: American Heart Journal
Jaimi Greenslade, Elizabeth Cho, Christopher Van Hise, Tracey Hawkins, William Parsonage, Jacobus Ungerer, Jillian Tate, Carel Pretorius, Martin Than, Louise Cullen
BACKGROUND: Low concentrations of cardiac troponin (cTn) have been recommended for rapid rule-out of acute myocardial infarction (AMI). We examined the Beckman Coulter Access high-sensitivity cardiac troponin I (hs-cTnI) assay to identify a single test threshold that can safely rule out AMI. METHODS: This analysis used stored samples collected in 2 prospective observational studies. In all, 1871 patients presenting to a tertiary emergency department with symptoms of acute coronary syndrome had blood taken for measurement of cTnI on presentation...
February 1, 2018: Clinical Chemistry
Wenchao Zhou, Kaiwei Li, Youlian Wei, Peng Hao, Mingbo Chi, Yongshun Liu, Yihui Wu
Sensitive detection of cardiac biomarkers is critical for clinical diagnostics of myocardial infarction (MI) while such detection is quite challenging due to the ultra-low concentration of cardiac biomarkers. In this work, a label-free immunosensor based on optical microfiber coupler (OMC) has been developed for the ultrasensitive detection of cardiac troponin I (cTnI), a selective and highly sensitive biomarker of acute myocardial infarction (AMI). CTnI monoclonal antibodies were immobilized on the surface of the fiber through polyelectrolyte layer using layer-by-layer deposition technique...
February 1, 2018: Biosensors & Bioelectronics
Dawei Fan, Chunzhu Bao, Malik Saddam Khan, Chuanlei Wang, Yong Zhang, Qinze Liu, Xian Zhang, Qin Wei
A novel label-free photoelectrochemical (PEC) sensor based on graphene quantum dots doped with nitrogen and sulfur (N,S-GQDs) and CdS co-sensitized hierarchical Zn2SnO4 cube was fabricated to detect cardiac troponin I (cTnI). The unique hierarchical Zn2SnO4 cube was synthesized successfully by the solvothermal method, which has a large specific surface to load functional materials. N,S-GQDs nanoparticles were assembled to the surface of cubic Zn2SnO4 coated ITO electrode, which efficiently accelerated the electronic transition and improved photo-to-current conversion efficiency...
January 29, 2018: Biosensors & Bioelectronics
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