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Troponin sensitive

Brittney Ann Klein, Béla Reiz, Ian Michael Robertson, Malcolm Irving, Liang Li, Yin-Biao Sun, Brian D Sykes
The development of calcium sensitizers for the treatment of systolic heart failure presents difficulties including judging the optimal efficacy and the specificity to target cardiac muscle. The thin filament is an attractive target since cardiac troponin-C (cTnC) is the site of calcium binding and the trigger for subsequent contraction. One widely studied calcium sensitizer is levosimendan. We have recently shown that when a covalent cTnC-levosimendan analog is exchanged into cardiac muscle cells, they become constitutively active, demonstrating the potency of a covalent complex...
March 20, 2018: Biochemistry
Aditya Mandawat, L Kristin Newby
No abstract text is available yet for this article.
March 20, 2018: Circulation
George A Karpouzas, Joel Estis, Panteha Rezaeian, John Todd, Matthew J Budoff
Objectives: Patients with RA display greater occult coronary atherosclerosis burden and experience higher cardiovascular morbidity and mortality compared with controls. We here explored whether pro-inflammatory cytokines and high-sensitivity cardiac troponin I (hs-cTnI), a biomarker of myocardial injury, correlated with plaque burden and cardiovascular events (CVEs) in RA. Methods: We evaluated 150 patients with 64-slice coronary CT angiography. Coronary artery calcium, number of segments with plaque (segment involvement score), stenotic severity and plaque burden were assessed...
March 14, 2018: Rheumatology
James L Januzzi, Sunil Suchindran, Adrian Coles, Maros Ferencik, Manesh R Patel, Udo Hoffmann, Geoffrey S Ginsburg, Pamela S Douglas
OBJECTIVES: The goal of this study was to examine associations between concentrations of high-sensitivity troponin I (hsTnI) (measured by using a single-molecule counting method) and obstructive coronary artery disease (CAD) in 1,844 stable, symptomatic outpatients with suspected CAD randomized to undergo coronary computed tomography angiography (CTA) in the PROMISE (Prospective Multicenter Imaging Study for Evaluation of Chest Pain) trial. BACKGROUND: Elevated concentrations of hsTnI are associated with CAD in patients with myocardial infarction...
March 9, 2018: JACC. Cardiovascular Imaging
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
Philipp Stieger, Obaida R Rana, Erol Saygili, Haschmatulla Zazai, Thomas Rauwolf, Conrad Genz, Rajen Bali, Ruediger C Braun-Dullaeus, Samir M Said
BACKGROUND: Implantable cardioverter/defibrillator (ICD) shocks can cause myocardial injury, contributing to the progression of the underlying heart disease. The aim was to evaluate whether internal electrical cardioversion (int-CV) via the ICD or conventional external CV (ext-CV) of persistent atrial fibrillation (AF) in heart failure (HF) patients induces myocardial injury and initiates inflammation. METHODS AND RESULTS: A total of 115 HF patients with an ejection fraction between 20% and 45% were prospectively enrolled...
March 12, 2018: 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
Feifei Li, Longyan Yi, Huiping Yan, Xuejing Wang, Jinlei Nie, Haifeng Zhang, Frank Hoo Kin Fu, Yanpeng Zang, Shuo Yang, Yifan Lu
Objective: The purpose of this study was to investigate the effects of a single bout of high-intensity interval exercise (HIIE) on high-sensitivity cardiac troponin T (hs-cTnT) release and to explore the potential influencing factors. Methods: Twenty-one experienced marathon runners completed HIIE on treadmill. Each bout of HIIE included a hard run (15.8 ± 1.3 km·h-1 ) at 90% vVO2max for 2 min followed by an easy run (8.8 ± 0.7 km·h-1 ) at 50% vVO2max for 2 min performed 23 times within 92 min...
December 2017: Journal of Exercise Science and Fitness
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
Alexandre de Matos Soeiro, Danielle Menosi Gualandro, Aline Siqueira Bossa, Cindel Nogueira Zullino, Bruno Biselli, Maria Carolina Feres de Almeida Soeiro, Tatiana de Carvalho Andreucci Torres Leal, Carlos Vicente Serrano, Mucio Tavares de Oliveira Junior
INTRODUCTION: Despite having higher sensitivity as compared to conventional troponins, sensitive troponins have lower specificity, mainly in patients with renal failure. OBJECTIVE: Study aimed at assessing the sensitive troponin I levels in patients with chest pain, and relating them to the existence of significant coronary lesions. METHODS: Retrospective, single-center, observational. This study included 991 patients divided into two groups: with (N = 681) and without (N = 310) significant coronary lesion...
January 2018: Arquivos Brasileiros de Cardiologia
Marcello Galvani, Cristina Bachetti
No abstract text is available yet for this article.
February 2018: Journal of Cardiovascular Medicine
Anum Saeed, Vijay Nambi, Wensheng Sun, Salim S Virani, George Taffet, Anita Deswal, Elizabeth Selvin, Kunihiro Matsushita, Lynne E Wagenknecht, Ron Hoogeveen, Josef Coresh, James A de Lemos, Christie M Ballantyne
BACKGROUND: Current prevention guidelines recommend using the Pooled Cohort Equation (PCE) for 10-year atherosclerotic cardiovascular disease (CVD) risk assessment. However, the PCE has serious limitations in older adults: it excludes heart failure (HF) hospitalization, estimates 10-year risk which may not be the most relevant time frame, and is not indicated for individuals aged >79 years. OBJECTIVES: To determine whether adding biomarkers to PCE variables improves global CVD (coronary heart disease [CHD], stroke, and HF) risk prediction in older adults over a shorter time period...
March 3, 2018: Journal of the American College of Cardiology
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
Fabian Aus dem Siepen, Christian Baumgärtner, Matthias Müller-Henessen, Florian André, Daniel Messroghli, Marco Ochs, Johannes Riffel, Evangelos Giannitsis, Hugo A Katus, Matthias G Friedrich, Sebastian J Buss
Background: Myocardial T1 and extracellular volume (ECV) derived from cardiovascular MRIs are more and more widely accepted as important markers for diagnosis, risk prediction and monitoring of cardiac disease. Yet data regarding long-term stability of myocardial T1 mapping are lacking. The aim of this study was to investigate the long-term stability of native and postcontrast T1 mapping values in healthy volunteers. Methods: 18 strictly selected healthy volunteers (52±10 years, 12 men) were studied on a Philips Achieva 1...
2018: Open Heart
David E Winchester, Kristopher Kline, Christopher Estel, Dhruv Mahtta, Sean Taasan, Franck W Peacock
Background: The impact of cardiac troponin (cTn) testing on the downstream use of cardiovascular services is not well understood. We conducted this large-scale single centre cohort study to investigate the patterns of testing that result from the use of cTn. Methods: We conducted this investigation using data collected between 1 January 2013 and 18 December 2015 from an academically affiliated tertiary care centre. Data from all hospitalised patients evaluated with cTn (Roche Elecsys cTn-T) assay were collected from our integrated data repository and divided into two cohorts: all cTn assays negative (<0...
2018: Open Heart
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
Mladjan Golubovic, Radmilo Jankovic, Dusan Sokolovic, Vladan Cosic, Vesna Maravic, Tomislav Kostic, Zoran Perisic, Nebojsa Ladjevic
OBJECTIVE: We evaluated the utility of preoperative mid-regional pro-adrenomedulin (MR-proADM) and cardiac troponin T (TnT) for improved detection of patients at high risk for perioperative cardiac events and mortality after major non-cardiac surgery. SUBJECTS AND METHODS: This prospective, single-center, observational study enrolled 79 patients undergoing major non-cardiac surgery. After initial clinical assessment (clinical history, physical examination, echocardiogram, blood tests, and chest X-ray), mid-regional pro-adrenomedulin and high sensitivity troponin T (hsTnT) were measured within 48 hours prior to surgery by immunoluminometric and electrochemiluminescence-immuno assay...
March 7, 2018: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
Joshua James Oliver, Matthew Jay Streitz, Jessica Marie Hyams, Richard Michael Wood, Yevgeniy Mikhaylovich Maksimenko, Brit Long, Robert Michael Barnwell, Michael David April
The impact of an outpatient disposition strategy for patients with HEART score 0-3 (HEART pathway) on HEART score prognostic accuracy is unclear. Our objective is to perform an external validation the HEART score in the setting of recent implementation of the HEART pathway. We conducted an external validation study of the HEART pathway among patients presenting to our ED with chest pain 6 weeks after institutional implementation of a HEART pathway outpatient disposition pathway. We reviewed the charts of 625 consecutive patients with chest pain...
March 6, 2018: Internal and Emergency Medicine
Takashi Hitsumoto
Background: The cardio-ankle vascular index (CAVI) is a novel physiological marker of atherosclerosis that reflects systemic arterial stiffness. The aim of this study was to clarify the clinical significance of CAVI as a risk factor for cardiovascular diseases (CVDs) in elderly patients with type 2 diabetes mellitus. Methods: This cross-sectional study enrolled 216 elderly (≥ 65 years) outpatients with type 2 diabetes mellitus who were undergoing antidiabetic treatment (96 males and 120 females; mean age, 75 ± 7 years (mean ± standard deviation))...
April 2018: Journal of Clinical Medicine Research
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