OBJECTIVES: The purpose of this study was to investigate the prognostic implications of low-level increases in cardiac troponin I (cTnI) using a current-generation sensitive assay in patients with suspected acute coronary syndrome (ACS). BACKGROUND: Recent enhancements in troponin assays have enabled resolution of the 99th percentile reference limit at progressively lower concentrations. However, the clinical significance of low-level increases with sensitive assays is still debated. METHODS: We measured cTnI using a sensitive assay (TnI-Ultra, Siemens Healthcare Diagnostics, Deerfield, Illinois) at baseline in 4,513 patients with non-ST-segment elevation ACS randomly assigned toranolazine or placebo. We applied decision limits at the 99th percentile reference limit (0.04 microg/l), the cut point of the predecessor assay (0.1 microg/l), and 1 equivalent to elevation of creatine kinase-myocardial band (1.5 ng/ml). RESULTS: Patients with baseline cTnI > or =0.04 microg/l (n = 2,924) were at higher risk of death/myocardial infarction (MI) at 30 days than were patients with a negative cTnI (6.1% vs. 2.0%, p < 0.001). After adjusting for the TIMI (Thrombolysis In Myocardial Infarction) risk score, cTnI > or =0.04 microg/l was associated with a 3-fold (95% confidence interval: 2.0 to 4.4, p < 0.001) higher risk of death/MI at 30 days. Moreover, patients with low-level increases (0.04 microg/l to <0.1 microg/l), were at significantly higher risk of death/MI at 30 days (5.0% vs. 2.0%, p = 0.001) and death at 12 months (6.4% vs. 2.4%, p = 0.005) than were patients with cTnI <0.04 microg/l. CONCLUSIONS: Low-level increases in cTnI using a sensitive assay identify patients at higher risk of death or MI. These findings support current American College of Cardiology/American Heart Association recommendations defining MI, and the incremental value of newer, more sensitive assays in identifying high-risk patients with ACS. Copyright 2010 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.
RCT Entities:
OBJECTIVES: The purpose of this study was to investigate the prognostic implications of low-level increases in cardiac troponin I (cTnI) using a current-generation sensitive assay in patients with suspected acute coronary syndrome (ACS). BACKGROUND: Recent enhancements in troponin assays have enabled resolution of the 99th percentile reference limit at progressively lower concentrations. However, the clinical significance of low-level increases with sensitive assays is still debated. METHODS: We measured cTnI using a sensitive assay (TnI-Ultra, Siemens Healthcare Diagnostics, Deerfield, Illinois) at baseline in 4,513 patients with non-ST-segment elevation ACS randomly assigned to ranolazine or placebo. We applied decision limits at the 99th percentile reference limit (0.04 microg/l), the cut point of the predecessor assay (0.1 microg/l), and 1 equivalent to elevation of creatine kinase-myocardial band (1.5 ng/ml). RESULTS:Patients with baseline cTnI > or =0.04 microg/l (n = 2,924) were at higher risk of death/myocardial infarction (MI) at 30 days than were patients with a negative cTnI (6.1% vs. 2.0%, p < 0.001). After adjusting for the TIMI (Thrombolysis In Myocardial Infarction) risk score, cTnI > or =0.04 microg/l was associated with a 3-fold (95% confidence interval: 2.0 to 4.4, p < 0.001) higher risk of death/MI at 30 days. Moreover, patients with low-level increases (0.04 microg/l to <0.1 microg/l), were at significantly higher risk of death/MI at 30 days (5.0% vs. 2.0%, p = 0.001) and death at 12 months (6.4% vs. 2.4%, p = 0.005) than were patients with cTnI <0.04 microg/l. CONCLUSIONS: Low-level increases in cTnI using a sensitive assay identify patients at higher risk of death or MI. These findings support current American College of Cardiology/American Heart Association recommendations defining MI, and the incremental value of newer, more sensitive assays in identifying high-risk patients with ACS. Copyright 2010 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.
Authors: Benjamin M Scirica; Marc S Sabatine; Petr Jarolim; Sabina A Murphy; James L de Lemos; Eugene Braunwald; David A Morrow Journal: Eur Heart J Date: 2010-12-22 Impact factor: 29.983
Authors: Aslan T Turer; Tayo A Addo; Justin L Martin; Marc S Sabatine; Gregory D Lewis; Robert E Gerszten; Ellen C Keeley; Joaquin E Cigarroa; Richard A Lange; L David Hillis; James A de Lemos Journal: J Am Coll Cardiol Date: 2011-06-14 Impact factor: 24.094
Authors: James Samir Díaz-Betancur; Juan Manuel Martínez; Juan Gabriel Zapata; Isabel Marín-Orozco Journal: Aging Clin Exp Res Date: 2020-10-24 Impact factor: 3.636