Abstract
Background
A correlation between left ventricular (LV) dyssynchrony (LVD) and impaired myocardial sympathetic tone has been hypothesized. We sought to assess the interactions between regional LV sympathetic innervation, perfusion, and mechanical dyssynchrony.
Methods
Eighty-three patients underwent evaluation of LV perfusion and sympathetic innervation on 99mTc-tetrofosmin/123I-metaiodobenzylguanidine (123I-MIBG) imaging. The summed rest score and summed 123I-MIBG score (SS-MIBG) were computed. The extent of “innervation/perfusion” mismatch was defined as the number of denervated LV segments with relatively preserved perfusion. LVD was evaluated on phase analysis and the wall with latest mechanical activation identified.
Results
LVD was revealed in 36 (43%) patients. Patients with LVD had more abnormal values of SRS (21 ± 9 vs 10 ± 8, P < 0.001) and SS-MIBG (29 ± 9 vs 17 ± 11, P < 0.001) than those without LVD. The presence of LVD also clustered with a higher burden of “innervation/perfusion” mismatch (P = 0.019). On per-wall analysis, LV walls with delayed mechanical activation showed a higher burden of “innervation/perfusion” mismatch (2.3 ± 1.4 segments) than normally contracting walls (1.3 ± 1.2 segments; P < 0.001). On multivariate analysis, the extent of “innervation/perfusion” mismatch was the only predictor of delayed mechanical activation (P = 0.029).
Conclusions
Patients with LVD show an elevated burden of “innervation/perfusion” mismatch that is concentrated at the level of the most dyssynchronous walls.
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Abbreviations
- SPECT:
-
Single-photon emission computed tomography
- CZT:
-
Cadmium-zinc-telluride
- LVD:
-
Left ventricular dyssynchrony
- 123I-MIBG:
-
123I-metaiodobenzylguanidine
- SRS:
-
Summed rest score
- SS-MIBG:
-
Summed 123I-MIBG score
- SD:
-
Standard deviation
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Supplementary material 2 (PPT 23 kb). Extent of “innervation/perfusion” mismatch (% of mismatched LV myocardium) on the different LV walls
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Gimelli, A., Liga, R., Menichetti, F. et al. Interactions between myocardial sympathetic denervation and left ventricular mechanical dyssynchrony: A CZT analysis. J. Nucl. Cardiol. 26, 509–518 (2019). https://doi.org/10.1007/s12350-017-1036-3
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DOI: https://doi.org/10.1007/s12350-017-1036-3