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Prevalence of Decreased Myocardial Blood Flow in Symptomatic Patients with Patent Coronary Stents: Insights from Low-Dose Dynamic CT Myocardial Perfusion Imaging

  • Yuehua Li (Institute of Diagnostic and Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital) ;
  • Mingyuan Yuan (Department of Radiology, Affiliated Zhoupu Hospital, Shanghai University of Medicine and Health Science) ;
  • Mengmeng Yu (Institute of Diagnostic and Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital) ;
  • Zhigang Lu (Department of Cardiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital) ;
  • Chengxing Shen (Department of Cardiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital) ;
  • Yining Wang (Department of Radiology, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College) ;
  • Bin Lu (Department of Radiology, Fuwai Hospital, State Key Laboratory of Cardiovascular Disease, National Centre for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College) ;
  • Jiayin Zhang (Institute of Diagnostic and Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital)
  • 투고 : 2018.06.28
  • 심사 : 2018.11.11
  • 발행 : 2019.04.01

초록

Objective: To study the prevalence and clinical characteristics of decreased myocardial blood flow (MBF) quantified by dynamic computed tomography (CT) myocardial perfusion imaging (MPI) in symptomatic patients without in-stent restenosis. Materials and Methods: Thirty-seven (mean age, 71.3 ± 10 years; age range, 48-88 years; 31 males, 6 females) consecutive symptomatic patients with patent coronary stents and without obstructive de novo lesions were prospectively enrolled to undergo dynamic CT-MPI using a third-generation dual-source CT scanner. The shuttle-mode acquisition technique was used to image the complete left ventricle. A bolus of contrast media (50 mL; iopromide, 370 mg iodine/mL) was injected into the antecubital vein at a rate of 6 mL/s, followed by a 40-mL saline flush. The mean MBF value and other quantitative parameters were measured for each segment of both stented-vessel territories and reference territories. The MBFratio was defined as the ratio of the mean MBF value of the whole stent-vessel territory to that of the whole reference territory. An MBFratio of 0.85 was used as the cut-off value to distinguish hypoperfused from non-hypoperfused segments. Results: A total of 629 segments of 37 patients were ultimately included for analysis. The mean effective dose of dynamic CT-MPI was 3.1 ± 1.2 mSv (range, 1.7-6.3 mSv). The mean MBF of stent-vessel territories was decreased in 19 lesions and 81 segments. Compared to stent-vessel territories without hypoperfusion, the mean MBF and myocardial blood volume were markedly lower in hypoperfused stent-vessel territories (77.5 ± 16.6 mL/100 mL/min vs. 140.4 ± 24.1 mL/100 mL/min [p < 0.001] and 6.4 ± 3.7 mL/100 mL vs. 11.5 ± 4 mL/100 mL [p < 0.001, respectively]). Myocardial hypoperfusion in stentvessel territories was present in 48.6% (18/37) of patients. None of clinical parameters differed statistically significantly between hypoperfusion and non-hypoperfusion subgroups. Conclusion: Decreased MBF is commonly present in patients who are symptomatic after percutaneous coronary intervention, despite patent stents and can be detected by dynamic CT-MPI using a low radiation dose.

키워드

과제정보

This study was supported by National Natural Science Foundation of China (Grant No.: 81671678, 81671673), Shanghai Municipal Education Commission-Gaofeng Clinical Medicine Grant Support (Grant No.: 20161428), Shanghai Key Discipline of Medical Imaging (No.: 2017ZZ02005), The National Key Research and Development Program of China (Grant No.: 2016YFC1300400, 2016YFC1300402), 2017 People's Livelihood Project Of PuDong Committee On Science And Technology In Shanghai (Grant No.: PKJ2017-Y39), Key And weak Specialty Construction Program of Pudong Health Bureau of Shanghai (Grant No.: PWZbr2017-11) and Shanghai Health Medical College Innovative collaborative project funding (Grant No.: SPCI-18-17-001).

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