Abstract
Background
Reperfused myocardium post-acute myocardial infarction (AMI) may have altered metabolism with implications for therapy response and function recovery. We explored glucose utilization and the “reverse mismatch” (RMM) pattern (decreased F-18-fluorodeoxyglucose (FDG) uptake relative to perfusion) in patients who underwent mechanical reperfusion with percutaneous coronary intervention (PCI) for AMI.
Methods and Results
Thirty-one patients with anterior wall AMI treated with acute reperfusion, with left ventricular ejection fraction ≤45%, underwent rest rubidium-82 (Rb-82) and FDG PET 2-10 days post-AMI. Resting echocardiograms were used to assess wall motion abnormalities. Significant RMM occurred in 15 (48%) patients and was associated with a shorter time to PCI of 2.9 hours (2.2, 13.3 hours) compared to patients without significant RMM: 11.4 hours (3.9, 22.4 hours) (P = .03). Within the peri-infarct regions, segments with significant RMM were more likely to have wall motion abnormalities (OR = 2.3 (1.1, 4.7), P = .02) compared to segments without significant RMM.
Conclusions
RMM is a common pattern on perfusion/FDG PET during the sub-acute phase following reperfusion of AMI and is associated with shorter times to PCI. Within the peri-infarct region, RMM occurs frequently and is more often associated with wall motion abnormalities than segments without RMM. Whether this represents a myocardial metabolic shift during the sub-acute phase of recovery warrants further study.
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Acknowledgments
The study was supported by grants from the Canadian Institutes of Health Research (Grant # 74569; CG PI), and supplemented by a program grant from the Heart and Stroke Foundation of Ontario (HSFO grant PRG6242; RB PI). D. Anselm was supported by the HSFO Studentship Fund and the Queen’s University JD Hatcher Foundation Award. D. Anselm and A. Anselm were co-supervised by R. Beanlands and C. Glover who were co-senior authors of this work. The study is registered at (NCT00394498, www.clinicaltrials.gov/ct2/show/NCT00394498). R. Beanlands is a Career Investigator supported by HSFO. The authors thank staff in the cardiac PET unit (May Aung, Kimberly Gardner, Michaela Garkish, Patricia Grant, Laurie Camrass) and cyclotron facility (Samantha Mason, Paul Coletta, Jeffrey Collins) and Stephanie Thorn, MSc, for their work and dedication to this project. Dr Beanlands has research grant funding from GE Healthcare, MDS Nordion.
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Anselm, D.D., Anselm, A.H., Renaud, J. et al. Altered myocardial glucose utilization and the reverse mismatch pattern on rubidium-82 perfusion/F-18-FDG PET during the sub-acute phase following reperfusion of acute anterior myocardial infarction. J. Nucl. Cardiol. 18, 657–667 (2011). https://doi.org/10.1007/s12350-011-9389-5
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DOI: https://doi.org/10.1007/s12350-011-9389-5