Effects of acute kidney injury and chronic kidney disease on long-term mortality after coronary artery bypass grafting

Seung Seok Han, Nara Shin, Seon Ha Baek, Shin Young Ahn, Dong Ki Kim, Sejoong Kim, Ho Jun Chin, Dong Wan Chae, Ki Young Na

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Background Both acute kidney injury (AKI) and chronic kidney disease (CKD) are important issues in patients undergoing coronary artery bypass grafting (CABG), particularly with regard to mortality. However, their synergistic or discrete effects on long-term mortality remain unresolved. Methods A total of 1,899 patients undergoing CABG were retrospectively analyzed. The adjusted hazard ratios for all-cause mortality were calculated after stratifying the timeframes. To evaluate the synergistic effects between AKI and CKD, the relative excess risk due to interaction was applied. Results The presence of AKI, CKD, or both increased the hazard ratios for mortality, compared with the absence of both: AKI alone, 1.84 (1.464-2.319); CKD alone, 2.46 (1.735-3.478); and AKI and CKD together, 3.21 (2.301-4.488). However, the relationships with mortality were different between AKI and CKD, according to the timeframes: AKI primarily affected early mortality, particularly within 3 years, whereas CKD had a relatively constant effect on both the early and late periods. When the parameters from the relative excess risk due to interaction were obtained, there was a synergistic additive effect on early mortality between AKI and CKD. Conclusions The relationships with mortality after CABG were different between AKI and CKD. However, their effects were not exclusive but synergistic.

Original languageEnglish
Pages (from-to)419-425
Number of pages7
JournalAmerican Heart Journal
Issue number3
Publication statusPublished - 2015 Jan 1
Externally publishedYes


ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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