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Definitions of post-coronary artery bypass grafting myocardial infarction: variations in incidence and prognostic significance.


ABSTRACT:

Objectives

Using data from the CORONARY trial (n?=?4752), we evaluated the incidence and prognostic significance of myocardial infarction (MI) applying different definitions based on peak postoperative creatine kinase-MB isoenzyme and cardiac troponin levels. We then aimed to identify the peak cardiac troponin during the first 3 postoperative days that was independently associated with a 2-fold increase in 30-day mortality.

Methods

To combine different assays, we analysed cardiac troponins in multiples of their respective upper limit of normal (ULN). We identified the lowest threshold with a hazard ratio (HR) >2 for 30-day mortality independent of EuroSCORE and on- versus off-pump surgery.

Results

Depending on the definition used based on creatine kinase-MB, the incidence of MI after coronary artery bypass grafting (CABG) ranged from 0.6% to 19% and the associated HRs for 30-day mortality ranged from 2.7 to 6.9. Using cardiac troponin (1528 patients), the incidence of MI ranged from 1.7% to 13% depending on the definition used with HRs for 30-day mortality ranging from 5.1 to 7.2. The first cardiac troponin threshold we evaluated, 180xULN, was associated with an adjusted HR for 30-day mortality of 7.6 [95% confidence interval (CI) 3.4-17.1] when compared to <130xULN. The next independent threshold was 130xULN with an adjusted HR for 30-day mortality of 7.8 (95% CI 2.3-26.1). The next cardiac troponin tested threshold (70xULN) did not meet criteria for significance.

Conclusions

Our results illustrate that the incidence and prognosis of a post-CABG MI varies based on the definition used. Validated post-CABG MI diagnostic criteria formulated from their independent association with important clinical outcomes are needed.

SUBMITTER: Belley-Cote EP 

PROVIDER: S-EPMC6908926 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Definitions of post-coronary artery bypass grafting myocardial infarction: variations in incidence and prognostic significance.

Belley-Cote Emilie P EP   Lamy André A   Devereaux P J PJ   Kavsak Peter P   Lamontagne François F   Cook Deborah J DJ   Kennedy Kevin K   Vincent Jessica J   Ou Yongning Y   Tagarakis George G   Whitlock Richard P RP  

European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery 20200101 1


<h4>Objectives</h4>Using data from the CORONARY trial (n = 4752), we evaluated the incidence and prognostic significance of myocardial infarction (MI) applying different definitions based on peak postoperative creatine kinase-MB isoenzyme and cardiac troponin levels. We then aimed to identify the peak cardiac troponin during the first 3 postoperative days that was independently associated with a 2-fold increase in 30-day mortality.<h4>Methods</h4>To combine different assays, we analysed cardiac  ...[more]

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