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Quantified coronary frequency domain optical coherence tomography signal analysis for the evaluation of erythrocyte-rich thrombus: ex-vivo validation study

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Abstract

Previous study has demonstrated that erythrocyte-rich thrombi contain more inflammatory cells and reflect high thrombus burden, leading to impaired myocardial reperfusion in myocardial infarction. The aim of this study is to investigate the utility of quantified frequency domain optical coherence tomography (FD-OCT) signal analysis in evaluating the erythrocyte-rich thrombus with ex-vivo materials. We evaluated 54 specimens of coronary artery thrombus obtained by thrombectomy catheter from 8 patients who underwent primary percutaneous coronary intervention. The thrombi were immersed in saline immediately after thrombectomy and FD-OCT image acquisition was performed ex-vivo. Quantitative analysis for all contiguous frames was performed by the dedicated automated software (OCT system software, Light Lab Inc.). For the maximum thrombus area, mean signal intensity (MSI) and normalized standard deviation of signal (NSD) was evaluated. All thrombi were stained using double staining of phosphotungstic acid—hematoxylin and eosin to enable automatic extraction of erythrocyte from fibrin. Computer-assisted analysis was performed using dedicated image processing software (WinROOF, Mitani Corp., Tokyo, Japan) for color identification of the erythrocyte area. Erythrocyte-rich thrombus, defined as % erythrocyte [(erythrocyte area/total thrombus area) × 100] ≥ 10%, showed significantly lower MSI [4.39 ± 0.24 vs. 4.74 ± 0.35, p = 0.002] than that of <10%. The cut-off point for prediction of erythrocyte-rich thrombus was defined as MSI ≤ 4.56, sensitivity: 87.5%, specificity: 82.9%, area under the curve: 0.836, respectively). The present ex-vivo study suggested the utility of quantified FD-OCT signal analysis on the detection of erythrocyte-rich thrombus.

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Authors and Affiliations

  1. Department of Internal Medicine, Teikyo University School of Medicine, 2-11-1 Kaga Itabashi-ku, Tokyo, 173–8605, Japan

    Yoshitaka Shiratori, Nobuaki Suzuki & Ken Kozuma

  2. Department of Pathology, Teikyo University School of Medicine, Tokyo, Japan

    Masato Watanabe & Toshio Fukusato

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  1. Yoshitaka Shiratori
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  2. Masato Watanabe
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  3. Nobuaki Suzuki
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  4. Toshio Fukusato
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  5. Ken Kozuma
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Correspondence to Yoshitaka Shiratori.

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Shiratori, Y., Watanabe, M., Suzuki, N. et al. Quantified coronary frequency domain optical coherence tomography signal analysis for the evaluation of erythrocyte-rich thrombus: ex-vivo validation study. Int J Cardiovasc Imaging 33, 587–594 (2017). https://doi.org/10.1007/s10554-016-1038-2

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  • DOI: https://doi.org/10.1007/s10554-016-1038-2

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