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Development and validation of a phase analysis tool to measure interventricular mechanical dyssynchrony from gated SPECT MPI

  • Original Article
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Journal of Nuclear Cardiology Aims and scope

Abstract

Objectives

The purpose of this study is to develop a right-ventricular (RV) phase analysis tool which when coupled with our left ventricular (LV) phase analysis tool can provide measurement of the interventricular mechanical dyssynchrony from gated SPECT myocardial perfusion imaging (MPI), and validate the tool by electrocardiography (ECG).

Methods

For each patient, short-axis LV and RV SPECT MPI images were input into an automatic sampling algorithm to generate the 3D maximal count circumferential profiles for both LV and RV in each cardiac frame. Subsequently, the samples of LV and RV were separately used by our phase analysis tool based on the first-harmonic Fourier approximation to calculate the contraction onset for each sample. The difference between contraction onsets of the middle LV free wall and middle LV septal wall represented the LV contraction delay; the difference between contraction onsets of the middle RV free wall and middle RV septal wall represented the RV contraction delay. The difference between the LV and RV contraction delays represented the interventricular contraction delay, which was compared with the interventricular conduction delay classified by ECG to validate the concordance of interventricular mechanical and electrical dyssynchrony. Sixty-one bundle branch block (BBB) patients with ischemic-dilated cardiomyopathy (26, 42.6%) or non-ischemic-dilated cardiomyopathy (35, 57.4%), who underwent 12-lead surface ECG and gated resting Tc-99m sestamibi SPECT, were retrospectively analyzed in this study.

Results

In the 30 patients with left bundle branch block (LBBB) by ECG, there were 27 patients whose LV contracted later than the RV according to SPECT; and in the 31 patients with right bundle branch block (RBBB) by ECG, there were 26 patients whose LV contracted earlier than the RV according to SPECT. In total, an agreement rate of 86.9% (53 of 61) was achieved between SPECT and ECG. The Kappa agreement rate was 73.8% (95% confidence interval 0.57-0.91).

Conclusion

The preliminary results showed promise for the measurement of interventricular mechanical dyssynchrony in BBB patients with dilated cardiomyopathy using our phase analysis tool.

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Abbreviations

RV:

Right ventricle/ventricular

LV:

Left ventricle/ventricular

SPECT:

Single-photon emission computed tomography

MPI:

Myocardial perfusion imaging/images

ECG:

Electrocardiography

CRT:

Cardiac resynchronization therapy

LBBB:

Left bundle branch block

RBBB:

Right bundle branch block

OSEM:

Ordered subset expectation maximization

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Acknowledgments

This research was partly supported by a grant from the American Heart Association (15POST22690035, PI: Weihua Zhou, Ph.D.) and a New Faculty startup grant from the University of Southern Mississippi (Project No.: DE01791). Drs. Chen and Garcia receive royalties from the sales of Emory Cardiac Toolbox.

Disclosure

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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Corresponding author

Correspondence to Dianfu Li MD, PhD.

Additional information

See related editorial, doi:10.1007/s12350-016-0550-z

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Zhou, W., Jiang, Z., Chen, J. et al. Development and validation of a phase analysis tool to measure interventricular mechanical dyssynchrony from gated SPECT MPI. J. Nucl. Cardiol. 24, 1680–1686 (2017). https://doi.org/10.1007/s12350-016-0503-6

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  • DOI: https://doi.org/10.1007/s12350-016-0503-6

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