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Relationship of quantitative parameters of myocardial perfusion SPECT and ventricular arrhythmia in patients receiving cardiac resynchronization therapy

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Abstract

Background

Ventricular arrhythmia is the major cause of sudden cardiac death for patients with heart failure, including those receiving implantation of cardiac resynchronization therapy (CRT). The purpose of this study was to assess the value of myocardial perfusion SPECT (MPS) in predicting ventricular arrhythmia for patients with CRT.

Methods and methods

Fifty-one patients (35 males, mean age 64 ± 12 years) who had received CRT for at least 6 months were enrolled for resting gated MPS. Three main quantitative parameters of MPS, including extent of myocardial scar, left ventricular ejection fraction (LVEF) and LV dyssynchrony (phase SD), were generated by Emory Cardiac Toolbox. Using the recorded ventricular arrhythmia in the device, including ventricular tachycardia (VT) and ventricular fibrillation (VF), as the primary end point, the value of quantitative parameters of MPS in predicting the development of VT/VF was assessed.

Results

Twenty (39 %) of the 51 patients developed VT/VF during the follow-up (15.3 ± 12.7 months). The patients with VT/VF had significantly lower LVEF (24 ± 12 vs. 36 ± 17 %, p < 0.005), larger scar areas (36 ± 19 vs. 22 ± 12 %, p < 0.05) and larger phase SD (57° ± 20° vs. 43° ± 17°, p < 0.01). When categorizing the patients by the median values of LVEF, scar and phase SD, univariate regression analysis showed that lower LVEF (<29 %), larger scar (>23 %) and larger phase SD (>50°) were related to the development of VT/VF (p = 0.006, 0.011 and 0.064, respectively). However, only LVEF was marginally significant as an independent predictor of VT//VF on multivariate regression analysis (p = 0.0573). Survival analysis with Kaplan–Meier curves showed that the survival probability for VT/VF in those with LVEF >29 %, scar areas <23 % and phase SD < 50° was significantly better than in the others (HR 5.16, 95 % CI 1.20–22.16) by log-rank test (χ 2 = 5.9894, p = 0.014).

Conclusion

Lower LVEF, larger scar and/or more dyssynchrony assessed by MPS were related to the development of ventricular arrhythmia for patients with CRT, and further defibrillator implantation may be considered for these patients.

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Acknowledgments

This study was supported in part by research grants from Chang Bing Show Chwan Memorial Hospital (RD-103029), Taiwan Ministry of Science and Technology (103-2314-B-758-001-), and Taichung Veterans General Hospital (TCVGH-1023105C, 1033106C, 1043106C, 1043102B).

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Correspondence to Guang-Uei Hung.

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Conflict of interest

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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Hou, PN., Tsai, SC., Lin, WY. et al. Relationship of quantitative parameters of myocardial perfusion SPECT and ventricular arrhythmia in patients receiving cardiac resynchronization therapy. Ann Nucl Med 29, 772–778 (2015). https://doi.org/10.1007/s12149-015-1007-1

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  • DOI: https://doi.org/10.1007/s12149-015-1007-1

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