Beyond mean heart dose: quantitative impact of sub-structure spatial dosimetrics on subclinical myocardial strain in thoracic radiotherapy

作者：Y. S. ZHANG, Xiaochen Han, Feifei Wang, Ruoling Han, Yasi Zhang, Ziqi Zhao, Dan Liu, Zifeng Chi · 发表于：Frontiers in Cardiovascular Medicine · 年份：2026 · DOI：10.3389/fcvm.2026.1884120 · 研究领域：Chemotherapy-induced cardiotoxicity and mitigation、Cardiovascular Function and Risk Factors、Hepatocellular Carcinoma Treatment and Prognosis

Purpose To evaluate the spatial dosimetric relationships between cardiac substructures and hyper-acute subclinical myocardial strain alterations after thoracic intensity-modulated radiotherapy (IMRT). Methods Forty patients with thoracic malignancies were prospectively enrolled. Two-dimensional speckle-tracking echocardiography (2D-STE) was performed at baseline and 1–2 days post-radiotherapy to assess left ventricular global longitudinal strain (LVGLS) and right ventricular free wall longitudinal strain (RVFWLS). Cardiac substructures, including the atrioventricular node (AVN), sinoatrial node (SAN), and right coronary artery (RCA), were contoured standardized. Acute subclinical strain alteration was defined as a ≥ 15% relative reduction from baseline. Optimal dosimetric cutoffs were determined via Maxstat analysis, and independent predictors were identified using multivariable logistic regression. Results Immediately post-radiotherapy, the incidence of hyper-acute subclinical strain alterations was 65% (26/40) for the right ventricle and 40% (16/40) for the left ventricle, captured by 2D-STE prior to any conventional LVEF decline. Multivariable analysis identified AVN D mean ≥ 6.83 Gy as an independent predictor of acute LV strain alterations (OR = 4.49, 95%CI: 3.46–5.82, P < 0.001). For the right ventricle, RCA V 5 ≥ 77.56% (OR = 6.0, 95%CI: 4.26–8.53, P < 0.001), SAN D max ≥ 33.36 Gy (OR = 3.07, 95%CI: 2.11–4.44, P < 0.001) were independent predictors...