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. 2023 Oct;30(5):2058-2067.
doi: 10.1007/s12350-023-03241-3. Epub 2023 Apr 24.

Dynamic perfusion SPECT for functional evaluation in symptomatic patients with myocardial bridging

Rende Xu #  1 , Hao Yang #  1 , Jie Zhang  2 , Shuguang Chen  2 , Lifang Pang  2 , Yizhe Wu  1 , Zhiqiang Pei  1 , Hongcheng Shi  2 , Chenguang Li  3 , Junbo Ge  4
Affiliations

Dynamic perfusion SPECT for functional evaluation in symptomatic patients with myocardial bridging

Rende Xu et al. J Nucl Cardiol. 2023 Oct.

Abstract

Background: The aim of this study was to investigate the feasibility and diagnostic value of myocardial flow reserve (MFR) assessed by rest/stress myocardial perfusion imaging with dynamic single-photon emission computed tomography (SPECT) in the functional evaluation of myocardial bridge (MB).

Methods: From May 2017 to July 2021, patients with angiographically confirmed isolated MB on the left anterior descending artery (LAD) who underwent dynamic SPECT myocardial perfusion imaging were retrospectively included. The assessment of semiquantitative indices of myocardial perfusion (summed stress scores, SSS) and quantitative parameters (MFR) was performed.

Results: A total of 49 patients were enrolled. The mean age of the subjects was 61.0 ± 9.0 years. All of the patients were symptomatic, and 16 cases (32.7%) presented with typical angina. SPECT-derived MFR showed a borderline significantly negative correlation with SSS (r = 0.261, P = .070). There was a trend of higher prevalence of impaired myocardial perfusion defined as MFR < 2 than as SSS ≥ 4 (42.9% vs 26.5%; P = .090).

Conclusion: Our data support that SPECT MFR may be a useful parameter for the functional assessment of MB. In patients with MB, the use of dynamic SPECT could be a potential method for hemodynamic assessment.

Keywords: Dynamic SPECT; functional significance; myocardial bridging; myocardial flow reserve.

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