Troponin is superior to electrocardiogram and creatinine kinase MB for predicting clinically significant myocardial injury after coronary artery bypass grafting

Jochen D. Muehlschlegel, Tjörvi E. Perry, Kuang Yu Liu, Luigino Nascimben, Amanda A. Fox, Charles D. Collard, Edwin G. Avery, Sary F. Aranki, Michael N. D'ambra, Stanton K. Shernan, Simon C. Body

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Aims cardiac biomarkers are routinely elevated after uncomplicated cardiac surgery to levels considered diagnostic of myocardial infarction in ambulatory populations. We investigated the diagnostic power of electrocardiogram (ECG) and cardiac biomarker criteria to predict clinically relevant myocardial injury using benchmarks of mortality and increased hospital length of stay (HLOS) in patients undergoing coronary artery bypass graft (CABG) surgery.Methods and resultsPerioperative ECGs, creatinine kinase MB fraction, and cardiac troponin I (cTnI) were assessed in 545 primary CABG patients. None of the ECG criteria for myocardial injury predicted mortality or HLOS. However, post-operative day (POD) 1 cTnI levels independently predicted 5-year mortality (hazard ratio = 1.42; 95 CI 1.14-1.76 for each 10 g/L increase; P = 0.009), while adjusting for baseline demographic characteristics and perioperative risk factors. Moreover, cTnI was the only biomarker that significantly improved the prediction of 5-year mortality estimated by the logistic Euroscore (P = 0.02). Furthermore, the predictive value of cTnI for 5-year mortality was replicated in a separately collected cohort of 1031 CABG patients using cardiac troponin T.ConclusionElectrocardiogram diagnosis of post-operative myocardial injury after CABG does not independently predict an increased risk of 5-year mortality or HLOS. Conversely, cTnI is independently associated with an increased risk of mortality and prolonged HLOS.

Original languageEnglish (US)
Pages (from-to)1574-1583
Number of pages10
JournalEuropean Heart Journal
Volume30
Issue number13
DOIs
StatePublished - Jul 2009

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Troponin
Coronary Artery Bypass
Length of Stay
Creatinine
Electrocardiography
Phosphotransferases
Troponin I
Wounds and Injuries
Mortality
Transplants
Biomarkers
Benchmarking
Troponin T
Thoracic Surgery
Myocardial Infarction
Demography

Keywords

  • Cardiopulmonary bypass
  • Electrocardiography
  • Enzymes
  • Mortality
  • Surgery
  • Troponin

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Cite this

Troponin is superior to electrocardiogram and creatinine kinase MB for predicting clinically significant myocardial injury after coronary artery bypass grafting. / Muehlschlegel, Jochen D.; Perry, Tjörvi E.; Liu, Kuang Yu; Nascimben, Luigino; Fox, Amanda A.; Collard, Charles D.; Avery, Edwin G.; Aranki, Sary F.; D'ambra, Michael N.; Shernan, Stanton K.; Body, Simon C.

In: European Heart Journal, Vol. 30, No. 13, 07.2009, p. 1574-1583.

Research output: Contribution to journalArticle

Muehlschlegel, JD, Perry, TE, Liu, KY, Nascimben, L, Fox, AA, Collard, CD, Avery, EG, Aranki, SF, D'ambra, MN, Shernan, SK & Body, SC 2009, 'Troponin is superior to electrocardiogram and creatinine kinase MB for predicting clinically significant myocardial injury after coronary artery bypass grafting', European Heart Journal, vol. 30, no. 13, pp. 1574-1583. https://doi.org/10.1093/eurheartj/ehp134
Muehlschlegel, Jochen D. ; Perry, Tjörvi E. ; Liu, Kuang Yu ; Nascimben, Luigino ; Fox, Amanda A. ; Collard, Charles D. ; Avery, Edwin G. ; Aranki, Sary F. ; D'ambra, Michael N. ; Shernan, Stanton K. ; Body, Simon C. / Troponin is superior to electrocardiogram and creatinine kinase MB for predicting clinically significant myocardial injury after coronary artery bypass grafting. In: European Heart Journal. 2009 ; Vol. 30, No. 13. pp. 1574-1583.
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AU - Perry, Tjörvi E.

AU - Liu, Kuang Yu

AU - Nascimben, Luigino

AU - Fox, Amanda A.

AU - Collard, Charles D.

AU - Avery, Edwin G.

AU - Aranki, Sary F.

AU - D'ambra, Michael N.

AU - Shernan, Stanton K.

AU - Body, Simon C.

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AB - Aims cardiac biomarkers are routinely elevated after uncomplicated cardiac surgery to levels considered diagnostic of myocardial infarction in ambulatory populations. We investigated the diagnostic power of electrocardiogram (ECG) and cardiac biomarker criteria to predict clinically relevant myocardial injury using benchmarks of mortality and increased hospital length of stay (HLOS) in patients undergoing coronary artery bypass graft (CABG) surgery.Methods and resultsPerioperative ECGs, creatinine kinase MB fraction, and cardiac troponin I (cTnI) were assessed in 545 primary CABG patients. None of the ECG criteria for myocardial injury predicted mortality or HLOS. However, post-operative day (POD) 1 cTnI levels independently predicted 5-year mortality (hazard ratio = 1.42; 95 CI 1.14-1.76 for each 10 g/L increase; P = 0.009), while adjusting for baseline demographic characteristics and perioperative risk factors. Moreover, cTnI was the only biomarker that significantly improved the prediction of 5-year mortality estimated by the logistic Euroscore (P = 0.02). Furthermore, the predictive value of cTnI for 5-year mortality was replicated in a separately collected cohort of 1031 CABG patients using cardiac troponin T.ConclusionElectrocardiogram diagnosis of post-operative myocardial injury after CABG does not independently predict an increased risk of 5-year mortality or HLOS. Conversely, cTnI is independently associated with an increased risk of mortality and prolonged HLOS.

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