Abstract
Background
Previous studies showed different dyssynchrony patterns between ischemic and normal myocardium at early post-stress using Tl-201 gated SPECT myocardial perfusion imaging (MPI). The aim of this study was to assess the relation of stress-induced dyssynchrony and the extent of angiographic coronary artery disease (CAD).
Methods and Results
The MPI images of 144 patients were retrospectively analyzed. With ≥70% stenosis as the criteria of CAD, 57 had no CAD, 32 had 1-vessel disease, 36 had 2-vessel disease, and 19 had 3-vessel disease, respectively. LV global and territorial dyssynchrony parameters were measured by the phase analysis from stress/rest Tl-201 SPECT MPI and compared between stress and rest among the patient groups. The patients with multi-vessel CAD had significantly more global dyssynchrony than the patients without ≥70% stenosis at stress. The patients with multi-vessel CAD showed significantly more global and territorial dyssynchrony on stress images than on rest. More patients with 3-vessel CAD were correctly classified as multi-vessel disease, when combining both visual interpretation and dyssynchrony assessment.
Conclusion
The patients with multi-vessel CAD had significantly more global and territorial dyssynchrony at early post-stress than at rest. Such quantitative measures of myocardial stunning may assist in the diagnosis of multi-vessel CAD.
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Acknowledgments
This study was supported in part by a research grant from Changhua Christain Hospital (102-CCH-IRP-060) and an NIH Grant (1R01HL094438, PI: Ji Chen, PhD).
Disclosure
Dr Ji Chen receives royalties from the sale of Emory Cardiac Toolbox with SyncTool. The terms of this arrangement have been reviewed and approved by Emory University in accordance with its conflict-of-interest practice.
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Wen-Sheng Huang and Ching-Hui Huang have contributed equally to this work.
See related editorial, doi:10.1007/s12350-014-9973-6.
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Huang, WS., Huang, CH., Lee, CL. et al. Relation of early post-stress left ventricular dyssynchrony and the extent of angiographic coronary artery disease. J. Nucl. Cardiol. 21, 1048–1056 (2014). https://doi.org/10.1007/s12350-014-9980-7
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DOI: https://doi.org/10.1007/s12350-014-9980-7