Detection of Acute Changes in Circulating Troponin in the Setting of Transient Stress Test-induced Myocardial Ischaemia Using an Ultrasensitive Assay: Results from TIMI 35

Overview

Journal Eur Heart J

Publisher Oxford University Press

Specialty Cardiology & Vascular Diseases

Date 2008 Nov 11

PMID 18997177

Citations 68

Authors

Marc S Sabatine

David A Morrow

James A de Lemos

Petr Jarolim

Eugene Braunwald

Affiliations

Soon will be listed here.

Abstract

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.

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