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Differential associations of cardiac troponin T and cardiac troponin I with coronary artery pathology and dynamics in response to short-duration exercise. | LitMetric

AI Article Synopsis

Article Abstract

Background: We aimed to assess the associations between cardiac troponin (cTn) T and I concentrations, physical exercise and the presence and severity of angiographic coronary artery disease (CAD) in patients evaluated for suspected chronic coronary syndrome (CCS).

Methods And Results: All patients performed an exercise stress test on a bicycle ergometer and underwent invasive coronary angiography with weighted anatomical evaluation using the Gensini score. Blood samples were collected before and after exercise and analysed with high-sensitivity (hs) cTnT and cTnI assays. Of 297 patients (median age 62 (Quartile [Q]1-3 56-69) years, 35% female), 46% were categorized as "severe CAD" (Gensini score ≥ 20). Resting hs-cTnT and hs-cTnI concentrations were detectable in 88% and 100% of patients, with medians of 6 (Q1-3 4-9) ng/L and 1.5 (0.9-2.4) ng/L, respectively. In adjusted normalized linear regression analyses, higher resting concentrations were associated with increasing Gensini score (hs-cTnT: B 0.19, 95% Confidence Interval [CI] [0.09-0.41], p < 0.001; hs-cTnI: B 0.18, [0.06-0.30], p = 0.002). The area under the receiver operating characteristics curve for predicting severe CAD was 0.72 (95% CI [0.66-0.78]) and 0.68 (0.62-0.74) for resting hs-cTnT and hs-cTnI, p = 0.11 for difference. The median (Q1-3) relative increase in hs-cTnT and hs-cTnI concentrations were 5 (0-12) % and 13 (3-27) %, respectively, with no significant associations with CAD severity.

Conclusions: In patients with suspected CCS, higher hs-cTn concentrations at rest were associated with increasing angiographic severity of CAD, without any significant differences between the troponin isotypes. Post-exercise hs-cTn concentrations did not have discriminatory power for CAD.

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Source
http://dx.doi.org/10.1016/j.clinbiochem.2020.11.005DOI Listing

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