Abstract
Cardiodynamicsgram (CDG) has emerged recently as a noninvasive spatiotemporal electrocardiographic method for subtle cardiac dynamics information analysis within electrocardiogram (ECG). This study explored the feasibility of CDG for detecting radiation-induced heart damage (RIHD) in a rat model. A single radiation dose of 40 Gy was delivered to the cardiac apex of female Wistar rats. First, CDG was generated through dynamic modeling of ECG signals using the deterministic learning algorithm. Furthermore, CDG indexes were calculated using the wavelet transform and entropy. In this model, CDG entropy indexes decreased significantly after radiotherapy. The shape of CDG changed significantly after radiotherapy (irregular shape) compared with controls (regular shape). Macrophage and fibrosis in myocardium of rats increased significantly after radiotherapy. CDG changes after radiotherapy were significantly correlated with histopathological changes and occurred significantly earlier than histopathological changes. This study provides an experimental basis for the clinical application of CDG for the early detection of RIHD.
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Data Availability
The data underlying this article will be made available on reasonable request.
Abbreviations
- CDG:
-
Cardiodynamicsgram
- RIHD:
-
Radiation-induced heart damage
- RT:
-
Radiotherapy
- ECG:
-
Electrocardiogram
- SARRP:
-
Small Animal Radiation Research Platform
- VCG:
-
Vectorcardiography
- IHC:
-
Immunohistochemical
- ANOVA:
-
One-way analysis of variance
- SD:
-
Standard deviation
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Funding
This study was supported by the Natural Science Foundation of Shandong Province (ZR2021QH008), the Bethune Charitable Foundation (flzh202116), and the Natural Science Foundation of China (82203218). This study was further supported by the Natural Science Foundation of China (NSFC81872475, NSFC82073345) and the Jinan Clinical Medicine Science and Technology Innovation Plan (202019060), and the Major Basic Program of Shandong Provincial Natural Science Foundation (ZR2020ZD40).
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YSH and WC designed the study; TYY and WYC analyzed data; TYY wrote the paper; SQH, LCM, and LJL contributed to the CDG analysis; TSS, PJL and LY revised the paper. All authors have read and approved the final version of the article.
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The animal experiments and procedures were performed with the approval of the Shandong Cancer Hospital and Institute of Medicine Institutional Animal Care and Use Committee. No human studies were carried out by the authors for this article.
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Yuanyuan Tao, Qinghua Sun, and Yuchun Wei these authors contributed equally to this work and should be considered co-first authors.
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12265_2023_10419_Fig7_ESM.png
Supplementary Fig. 1 Dose distributions in the transverse, sagittal, and coronal sections and dose–volume histogram (DVH) (PNG 489 kb)
12265_2023_10419_Fig9_ESM.png
Supplementary Fig. 3 Typical CDG changes in rat at different time points after RT. Control: Before RT; 3d: third day after RT; 5d: fifth day after RT; 1w: 1 week after RT; 2w: 2 weeks after RT; 3w: 3 weeks after RT; 1 m: 1 month after RT; 2 m: 2 months after RT; 3 m: 3 months after RT; 6 m: 6 months after RT (PNG 962 kb)
12265_2023_10419_Fig10_ESM.png
Supplementary Fig. 4 Changes in QT interval and RR interval in ECG after RT. A: QT interval; B: RR interval. n = 4 each time point, radiation vs control, ****P < 0.0001 (PNG 65 kb)
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Tao, Y., Sun, Q., Wei, Y. et al. Early and Accurate Detection of Radiation-induced Heart Damage by Cardiodynamicsgram. J. of Cardiovasc. Trans. Res. 17, 242–251 (2024). https://doi.org/10.1007/s12265-023-10419-0
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DOI: https://doi.org/10.1007/s12265-023-10419-0