Seung Seok Han1, Nara Shin1, Seon Ha Baek2, Shin Young Ahn2, Dong Ki Kim1, Sejoong Kim2, Ho Jun Chin2, Dong-Wan Chae2, Ki Young Na3. 1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea. 2. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea. 3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea. Electronic address: kyna@snubh.org.
Abstract
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.
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.
Authors: Yeonhee Lee; Jiwon Park; Myoung-Jin Jang; Hong Ran Moon; Dong Ki Kim; Kook-Hwan Oh; Kwon Wook Joo; Chun Soo Lim; Yon Su Kim; Ki Young Na; Seung Seok Han Journal: Medicine (Baltimore) Date: 2019-05 Impact factor: 1.817