BACKGROUND We aimed to investigate the effects of sex, prevalent cardiovascular disease (CVD), and aging on the 99th percentile of cardiac troponin I (cTnI). METHODS cTnI was measured using a high-sensitivity assay (Abbott Diagnostics) in 814 community-dwelling individuals at both 70 and 75 years of age. We determined the cTnI 99th percentiles separately using nonparametric methods in the tot...

Secondary phosphorylation develops in myocytes expressing phospho-mimetic cardiac troponin I (cTnI) but it is not known whether multiple substitutions (e.g. cTnISDTD and cTnIS4D) cause preferential phosphorylation of the remaining endogenous or the phospho-mimetic cTnI in intact myocytes. Western analysis was performed to determine whether the FLAG/total cTnI ratios are similar for phosphorylat...

beta-Adrenergic stimulation of the heart results in bisphosphorylation of the N-terminal extension of cardiac troponin I (TnI). Bisphosphorylation of TnI reduces the affinity of the regulatory site on troponin C (TnC) for Ca(2+) by increasing the rate of Ca(2+) dissociation. What remains unclear is how the phosphorylation signal is transmitted from one subunit of troponin to another. We have pr...

The measurement of serum creatine kinase (CK), which is used widely in the diagnosis and management of polymyositis and dermatomyositis lacks both sensitivity and specificity, leading to potential problems if the serum total CK concentration is interpreted as a direct measure of muscle disease activity. Furthermore, in those cases where the total CK is raised reliance on an analysis of the CK i...

The measurement of serum creatine kinase (CK), which is used widely in the diagnosis and management of polymyositis and dermatomyositis lacks both sensitivity and specificity, leading to potential problems if the serum total CK concentration is interpreted as a direct measure of muscle disease activity. Furthermore, in those cases where the total CK is raised reliance on an analysis of the CK i...

I read with great interest the article of Kavsak et al. (1 ) on the utility of a next-generation high-sensitivity Beckman Coulter cardiac troponin I (cTnI) assay with a 20% CV at 2.95 ng/L. This approach demonstrated a higher diagnostic sensitivity (81% vs 62%) for myocardial injury with a changing pattern of cTnI values, compared with the AccuTnI assay cleared by the US Food and Drug Administr...

INTRODUCTION This study aimed to examine the recovery of spiked human cardiac troponin I (cTnI) results measured by four routine assays, and investigate possible interference from microclots. MATERIALS AND METHODS 457 consecutive samples with cTnI concentration below limit of quantitation (12 ng/L), declared by the Vitros TnI ES assay (reference assay), were measured on Beckman Coulter Accu T...

Cruzain is an essential cysteine protease of Trypanosoma cruzi and a therapeutic target for Chagas' disease. Eight dogs were infected with T. cruzi; three were treated with an inhibitor of cruzain, K777, for 14 days. Treatment with K777 abrogated myocardial damage by T. cruzi, as documented by histopathological lesion scores and serum troponin I levels.

background: daunorubicin‑induced acute cardiotoxicity caused by oxidative stress and free radical formation. pomegranate possessed a significant in vitro free radical scavenging activity. therefore, the aim of this study was estimations of the role of pomegranate effects in daunorubicin‑induced cardiotoxicity. methods: a total of 21 sprague male rats were allocated into three groups, seven anim...