Department of Quantitative Health Sciences; Department of Medicine, Division of Cardiovascular Medicine
Cardiology | Cardiovascular Diseases | Surgery
BACKGROUND: Systemic thromboxane generation, not suppressible by standard aspirin therapy and likely arising from nonplatelet sources, increases the risk of atherothrombosis and death in patients with cardiovascular disease. In the RIGOR (Reduction in Graft Occlusion Rates) study, greater nonplatelet thromboxane generation occurred early compared with late after coronary artery bypass graft surgery, although only the latter correlated with graft failure. We hypothesize that a similar differential association exists between nonplatelet thromboxane generation and long-term clinical outcome.
METHODS AND RESULTS: Five-year outcome data were analyzed for 290 RIGOR subjects taking aspirin with suppressed platelet thromboxane generation. Multivariable modeling was performed to define the relative predictive value of the urine thromboxane metabolite, 11-dehydrothromboxane B2 (11-dhTXB2), measured 3 days versus 6 months after surgery on the composite end point of death, myocardial infarction, revascularization or stroke, and death alone. 11-dhTXB2 measured 3 days after surgery did not independently predict outcome, whereas 11-dhTXB2 > 450 pg/mg creatinine measured 6 months after surgery predicted the composite end point (adjusted hazard ratio, 1.79; P=0.02) and death (adjusted hazard ratio, 2.90; P=0.01) at 5 years compared with lower values. Additional modeling revealed 11-dhTXB2 measured early after surgery associated with several markers of inflammation, in contrast to 11-dhTXB2 measured 6 months later, which highly associated with oxidative stress.
CONCLUSIONS: Long-term nonplatelet thromboxane generation after coronary artery bypass graft surgery is a novel risk factor for 5-year adverse outcome, including death. In contrast, nonplatelet thromboxane generation in the early postoperative period appears to be driven predominantly by inflammation and did not independently predict long-term clinical outcome.
aspirin, inflammation, oxidative stress, thrombosis, thromboxane
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Copyright 2017 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is noncommercial and no modifications or adaptations are made.
DOI of Published Version
J Am Heart Assoc. 2017 Nov 2;6(11). pii: e007486. doi: 10.1161/JAHA.117.007486. Link to article on publisher's site
Journal of the American Heart Association
Kakouros N, Gluckman TJ, Conte JV, Kickler TS, Laws K, Barton BA, Rade JJ. (2017). Differential Impact of Serial Measurement of Nonplatelet Thromboxane Generation on Long-Term Outcome After Cardiac Surgery. University of Massachusetts Medical School Faculty Publications. https://doi.org/10.1161/JAHA.117.007486. Retrieved from https://escholarship.umassmed.edu/faculty_pubs/1404
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This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.