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Effect of left ventricular function on diagnostic accuracy of FDG SPECT

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Abstract

Objectives

Fluorine-18 fluorodeoxyglucose (FDG) SPECT has emerged as an alternative to dedicated PET imaging. However, it remains uncertain whether FDG SPECT is an as accurate for viability assessment as FDG PET in patients with severely reduced left ventricular function. The aim of the study was to assess the diagnostic accuracy of FDG SPECT in a head-to-head comparison with FDG PET, and divide the patients according to the severity of left ventricular dysfunction.

Methods

A total of 47 patients, with a history of myocardial infarction underwent FDG/perfusion (99mTc-sestamibi or201T1) SPECT as well as FDG/13N-ammonia PET. The patients were divided into 2 subgroups based on the left ventricular ejection fraction (LVEF) (35% cutoff). The left ventricular myocardium was divided into 13 segments, and each segment was classified as viable or scar using a semi-quantitative scoring system based on defect severity and the presence or absence of perfusion-FDG mismatch.

Results

Of the 47 patients studied, 23 had LVEF < 35% (low LVEF group; mean 25 ± 7%), whereas the remaining 24 had LVEF > 35% (high LVEF group; mean 47 ± 6%). In the low LVEF group, 213 segments (71%) were dysfunctional, as compared to 102 (33%) in the high LVEF group. The agreement for detection of viability between PET and SPECT in the low LVEF group was 82% (kappa 0.63), which was not different from the agreement in the high LVEF group (85%, kappa 0.66, p = 0.42 versus low LVEF group).

Conclusions

The results indicate that FDG SPECT can be used for tissue viability assessment regardless of the severity of left ventricular dysfunction.

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Correspondence to Ichiro Matsunari.

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Matsunari, I., Bax, J.J., Blanksma, P.K. et al. Effect of left ventricular function on diagnostic accuracy of FDG SPECT. Ann Nucl Med 20, 51–56 (2006). https://doi.org/10.1007/BF02985591

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  • DOI: https://doi.org/10.1007/BF02985591

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