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Jack Marjot

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https://www.readbyqxmd.com/read/29199434/a-single-centre-prospective-cohort-study-addressing-the-effect-of-a-rule-in-rule-out-troponin-algorithm-on-routine-clinical-practice
#1
Jack Marjot, Thomas E Kaier, Katherine Henderson, Laura Hunter, Michael S Marber, Divaka Perera
AIMS: In 2015, the European Society of Cardiology introduced new guidelines for the diagnosis of acute coronary syndromes in patients presenting without persistent ST-segment elevation. These guidelines included the use of high-sensitivity troponin assays for 'rule-in' and 'rule-out' of acute myocardial injury at presentation (using a '0 hour' blood test). Whilst these algorithms have been extensively validated in prospective diagnostic studies, the outcome of their implementation in routine clinical practice has not been described...
December 1, 2017: European Heart Journal. Acute Cardiovascular Care
https://www.readbyqxmd.com/read/28972002/direct-comparison-of-cardiac-myosin-binding-protein-c-with-cardiac-troponins-for-the-early-diagnosis-of-acute-myocardial-infarction
#2
MULTICENTER STUDY
Thomas E Kaier, Raphael Twerenbold, Christian Puelacher, Jack Marjot, Nazia Imambaccus, Jasper Boeddinghaus, Thomas Nestelberger, Patrick Badertscher, Zaid Sabti, Maria Rubini Giménez, Karin Wildi, Petra Hillinger, Karin Grimm, Sarah Loeffel, Samyut Shrestha, Dayana Flores Widmer, Janosch Cupa, Nikola Kozhuharov, Òscar Miró, F Javier Martín-Sánchez, Beata Morawiec, Katharina Rentsch, Jens Lohrmann, Wanda Kloos, Stefan Osswald, Tobias Reichlin, Ekkehard Weber, Michael Marber, Christian Mueller
BACKGROUND: Cardiac myosin-binding protein C (cMyC) is a cardiac-restricted protein that is more abundant than cardiac troponins (cTn) and is released more rapidly after acute myocardial infarction (AMI). We evaluated cMyC as an adjunct or alternative to cTn in the early diagnosis of AMI. METHODS: Unselected patients (N=1954) presenting to the emergency department with symptoms suggestive of AMI, concentrations of cMyC, and high-sensitivity (hs) and standard-sensitivity cTn were measured at presentation...
October 17, 2017: Circulation
https://www.readbyqxmd.com/read/28377413/quantifying-the-release-of-biomarkers-of-myocardial-necrosis-from-cardiac-myocytes-and-intact-myocardium
#3
Jack Marjot, Thomas E Kaier, Eva D Martin, Shiney S Reji, O'Neal Copeland, Mohammed Iqbal, Bob Goodson, Sarah Hamren, Sian E Harding, Michael S Marber
BACKGROUND: Myocardial infarction is diagnosed when biomarkers of cardiac necrosis exceed the 99th centile, although guidelines advocate even lower concentrations for early rule-out. We examined how many myocytes and how much myocardium these concentrations represent. We also examined if dietary troponin can confound the rule-out algorithm. METHODS: Individual rat cardiac myocytes, rat myocardium, ovine myocardium, or human myocardium were spiked into 400-μL aliquots of human serum...
May 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/26713894/the-development-and-application-of-a-high-sensitivity-immunoassay-for-cardiac-myosin-binding-protein-c
#4
Jack Marjot, Christoph Liebetrau, Robert J Goodson, Thomas Kaier, Ekkehard Weber, Peter Heseltine, Michael S Marber
Cardiac troponins (cTns) are released and cleared slowly after myocardial injury. Cardiac myosin-binding protein C (cMyC) is a similar cardiac-restricted protein that has more rapid release and clearance kinetics. Direct comparisons are hampered by the lack of an assay for cMyC that matches the sensitivity of the contemporary assays for cTnI and cTnT. Using a novel pair of monoclonal antibodies, we generated a sensitive assay for MyC on the Erenna platform (Singulex) and compared serum concentrations with those of cTnI (Abbott) and cTnT (Roche) in stable ambulatory cardiac patients without evidence of acute cardiac injury or significant coronary artery stenoses...
April 2016: Translational Research: the Journal of Laboratory and Clinical Medicine
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