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Myocardial Blood Flow and Flow Reserve in Proximal and Mid-to-Distal Lesions of Left Anterior Descending Artery Measured By N-13 Ammonia PET/CT

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Abstract

Purpose

The purpose of this study is to compare the myocardial blood flow (MBF) and flow reserve (MFR) between proximal and mid-to-distal lesions of the left anterior descending artery (pLAD and mdLAD, respectively) using N-13 ammonia positron emission tomography/computed tomography (PET/CT).

Methods

Subjects were 11 patients (six men and five women, mean age 64.5 years) with known coronary artery disease (CAD) involving LAD studied by N-13 ammonia PET/CT. They were divided into two groups by the location of stenotic lesions, i.e. pLAD versus mdLAD. Global and regional MBF and MFR were measured and compared. Characteristics of perfusion defects including the number of involved segments, basal area involvement, location, size, and shape were also compared between the two groups.

Results

The regional MFR in mid-anterior segment was significantly lower in pLAD group (1.80 ± 0.35 vs 2.76 ± 1.13 for pLAD and mdLAD groups, respectively, p = 0.034), while global MFR was not different (2.10 ± 1.10 vs 2.34 ± 0.84). Both stress and rest MBF in LAD territories were not different in both groups. The size of the perfusion defects were significantly larger in pLAD group (44.0 ± 11.5 % vs 21.1 ± 15.8 %, p = 0.041). Other characteristics such as location, basal area involvement, and shape were not significantly different between two groups.

Conclusions

The proximal lesion makes lower MFR in the mid-anterior segment and larger perfusion defect in the LAD territory but comparable MBF compared with mdLAD lesion.

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Acknowledgements

This study was supported by a grant (A070001) from the Korea National Enterprise for Clinical Trials.

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Correspondence to Hee-Seung Bom.

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Fig. 4

Coronary angiography of a 72-year-old man shows 70 %-stenosis of the mid-LAD (white arrow, a) and a mild stenosis of the first diagonal branch (black arrow, a). Also noted is a concomitant moderate stenosis in the mid-RCA (arrow, b). Perfusion defects involving basal anterior wall, apex, and inferior wall are noted on polar map image (c). (JPEG 50 kb)

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Cho, SG., Kim, J.H., Cho, J.Y. et al. Myocardial Blood Flow and Flow Reserve in Proximal and Mid-to-Distal Lesions of Left Anterior Descending Artery Measured By N-13 Ammonia PET/CT. Nucl Med Mol Imaging 47, 158–165 (2013). https://doi.org/10.1007/s13139-013-0208-6

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  • DOI: https://doi.org/10.1007/s13139-013-0208-6

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