OBJECTIVE ST-segment elevation in acute pericarditis is believed to be caused by superficial myocardial inflammation or epicardial injury. We used cardiac troponin I, a sensitive and specific marker of myocardial injury, to assess myocardial lesions in idiopathic acute pericarditis and its relationship to ST-segment elevation. PATIENTS AND METHODS Sixty-nine consecutive patients (53 men, 48+/...

During β-adrenergic stimulation, cardiac troponin I (cTnI) is phosphorylated by protein kinase A (PKA) at sites S23/S24, located at the N-terminus of cTnI. This phosphorylation has been shown to decrease KCa and pCa50, and weaken the cTnC-cTnI (C-I) interaction. We recently reported that phosphorylation results in an increase in the rate of early, slow phase of relaxation (kREL,slow) and a decr...

BACKGROUND Half a million children die annually of severe acute malnutrition and cardiac dysfunction may contribute to the mortality. However, cardiac function remains poorly examined in cases of severe acute malnutrition. OBJECTIVE To determine malnutrition-induced echocardiographic disturbances and longitudinal changes in plasma pro-atrial natriuretic peptide and cardiac troponin-T in a ped...

BACKGROUND In most patients with stable coronary artery disease, plasma cardiac troponin T levels are below the limit of detection for the conventional assay. The distribution and determinants of very low circulating troponin T levels, as well as their association with cardiovascular events, in such patients are unknown. METHODS We used a new, high-sensitivity assay to determine the concentra...

BACKGROUND Despite superior diagnostic accuracy of high-sensitivity cardiac troponins, their prognostic value has not been validated against conventional cardiac troponins. OBJECTIVE To test the prognostic value of high-sensitivity cardiac troponin I (hs-cTnI), compared with conventional cardiac troponin T (cTnT) in the setting of non-ST elevation acute coronary syndromes. METHODS At hospit...

The number of attendances and admissions of patients with chest pain to hospitals in England and Wales is increasing. Initial assessment may be unrewarding. Consequently, cardiac troponin has become the mainstay of investigation for non-ST-segment-elevation myocardial infarction and unstable angina, although only a small proportion of patients are eventually diagnosed as such. Current National ...

OBJECTIVES Biochemical markers are important for the timely diagnosis and follow-up of ischemic events. Most of the markers have been previously studied in the context of cardiac ischemia. However, research on markers of non-cardiac events has been insufficient. Therefore, we investigated the relationship between troponin and myoglobin which are commonly used markers of cardiac ischemia, in non...

Severina ME, et al. Troponin I is released in bloodstream of patients with acute myocardial infarction not in free form but as complex. Clin Chem 1997;43:1379–85. 12. Giuliani I, Bertinchant J-P, Granier C, Laprade M, Chocron S, Toubin G, et al. Determination of cardiac troponin I forms in the blood of patients with acute myocardial infarction and patients receiving crystalloid or cold blood ca...

We have for many years advocated for very precise cardiac troponin assays to improve the sensitivity of detection of cardiac necrosis and to decrease over time the amount of change (or delta) in cardiac troponin concentrations needed to be considered significant (1, 2 ). During the time period when assays were insufficiently precise at very low levels, we and others advocated using as a cutoff ...

The three major components of bovine cardiac troponin were separated by successive chromatography on sulfopropyl-Sephadex and DEAE-Sephadex columns in the presence of 6 M urea. All three of the bovine cardiac troponin subunits were necessary to restore full troponin activity in both skeletal and cardiac actomyosin ATPase assay systems. The 38,000-dalton subunit bound tropomyosin, and the 20,000...