TY - JOUR
T1 - Detection of acute changes in circulating troponin in the setting of transient stress test-induced myocardial ischaemia using an ultrasensitive assay
T2 - Results from TIMI 35
AU - Sabatine, Marc S.
AU - Morrow, David A.
AU - de Lemos, James A
AU - Jarolim, Petr
AU - Braunwald, Eugene
N1 - Funding Information:
has received research grant support from Beckman-Coulter and Roche.
Funding Information:
Measurement of cardiac troponin I using the Singulex Erenna System was performed by Singulex, Inc. Measurement of B-type natriuretic peptide was performed by Biosite, Inc. M.S.S. and D.A.M. are supported in part by NIH grant U01 HL083-1341. M.S.S. and J.A.de.L. are supported in part by the Donald W. Reynolds Foundation. M.S.S. has received research grant support from Ortho-Clinical Diagnostics and Roche Diagnostics. D.A.M. has received honoraria for educational presentations from Bayer Diagnostics, Beckman-Coulter, Dade-Behring, Sanofi-Aventis, and Roche Diagnostics. He has served as a consultant for GlaxoSmithKline and Sanofi-Aventis and on advisory boards for Beckman-Coulter, Critical Diagnostics, Genentech, Ortho-Clinical Diagnostics, Roche Diagnositcs, and Siemens Medical Solutions. J.A.de.L. has received research grant support and/or honoraria from Biosite and Roche. P.J. has received honoraria from Siemens. E.B.
PY - 2009/1
Y1 - 2009/1
N2 - Aims: To determine whether an ultrasensitive assay can permit quantification of changes in circulating cardiac troponin (Tn) in the setting of stress test-induced myocardial ischaemia. Methods and results: Blood samples were obtained before, immediately after, and 2 and 4 h after stress testing with nuclear perfusion imaging in 120 patients. Troponin was measured using commercial assays as well as with a novel, ultrasensitive cardiac TnI assay with a limit of detection of 0.2 pg/mL. Using the ultrasensitive assay, TnI was detectable in all patients before stress testing (median 4.4 pg/mL, interquartile range 3.1-8.6 pg/mL). By 4 h, troponin levels were unchanged in patients without ischaemia, whereas circulating levels had increased by a median of 1.4 pg/mL (24% increase) in patients with mild ischaemia (P = 0.002) and by 2.1 pg/mL (40% increase) in patients with moderate-to-severe ischaemia (P = 0.0006). In contrast, changes in troponin levels across patients in different ischaemic categories were indistinguishable using commercial troponin assays. When added to clinical factors, a >1.3 pg/mL increase in TnI using the ultrasensitive assay was an independent predictor of ischaemia (odds ratio 3.54, P = 0.007). Conclusion: Transient stress test-induced myocardial ischaemia is associated with a quantifiable increase in circulating troponin that is detectable with a novel, ultrasensitive TnI assay.
AB - Aims: To determine whether an ultrasensitive assay can permit quantification of changes in circulating cardiac troponin (Tn) in the setting of stress test-induced myocardial ischaemia. Methods and results: Blood samples were obtained before, immediately after, and 2 and 4 h after stress testing with nuclear perfusion imaging in 120 patients. Troponin was measured using commercial assays as well as with a novel, ultrasensitive cardiac TnI assay with a limit of detection of 0.2 pg/mL. Using the ultrasensitive assay, TnI was detectable in all patients before stress testing (median 4.4 pg/mL, interquartile range 3.1-8.6 pg/mL). By 4 h, troponin levels were unchanged in patients without ischaemia, whereas circulating levels had increased by a median of 1.4 pg/mL (24% increase) in patients with mild ischaemia (P = 0.002) and by 2.1 pg/mL (40% increase) in patients with moderate-to-severe ischaemia (P = 0.0006). In contrast, changes in troponin levels across patients in different ischaemic categories were indistinguishable using commercial troponin assays. When added to clinical factors, a >1.3 pg/mL increase in TnI using the ultrasensitive assay was an independent predictor of ischaemia (odds ratio 3.54, P = 0.007). Conclusion: Transient stress test-induced myocardial ischaemia is associated with a quantifiable increase in circulating troponin that is detectable with a novel, ultrasensitive TnI assay.
KW - Myocardial ischaemia
KW - Stress test
KW - Troponin
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U2 - 10.1093/eurheartj/ehn504
DO - 10.1093/eurheartj/ehn504
M3 - Article
C2 - 18997177
AN - SCOPUS:58449111027
SN - 0195-668X
VL - 30
SP - 162
EP - 169
JO - European heart journal
JF - European heart journal
IS - 2
ER -