Key result
Post-chemotherapy breast cancer patients showed subclinical left-ventricular abnormalities compared to healthy controls, including reduced global longitudinal strain (-0.15 vs -0.21; P<0.001).
Why the study?
This study investigated the occurrence of cardiotoxicity-related left-ventricular contractile dysfunction in breast cancer patients following treatment with antineoplastic chemotherapy agents.
Does automated MRI-based contractility analysis detect subclinical LV abnormalities in post-chemotherapy breast cancer patients compared to healthy subjects?
Observational (n=42)
Does automated MRI-based contractility analysis detect subclinical LV abnormalities in post-chemotherapy breast cancer patients compared to healthy subjects?
Absolute Event Rate: -0.15% vs -0.21%
p-value: p=<0.001
Automated MRI-based contractility analysis using DENSE can detect subclinical LV dysfunction, such as reduced longitudinal strain and torsion, in post-chemotherapy breast cancer patients with preserved LVEF.
May support automated MRI strain monitoring for subclinical cardiotoxicity in survivors; hypothesis-generating pending prospective outcome studies.
Objective: This study investigated the occurrence of cardiotoxicity-related left-ventricular (LV) contractile dysfunction in breast cancer patients following treatment with antineoplastic chemotherapy agents. Methods: A validated and automated MRI-based LV contractility analysis tool consisting of quantization-based boundary detection, unwrapping of image phases and the meshfree Radial Point Interpolation Method was used toward measuring LV chamber quantifications (LVCQ), three-dimensional strains and torsions in patients and healthy subjects. Data were acquired with the Displacement Encoding with Stimulated Echoes (DENSE) sequence on 21 female patients and 21 age-matched healthy females. Estimates of patient LVCQs from DENSE acquisitions were validated in comparison to similar steady-state free precession measurements and their strain results validated via Bland–Altman interobserver agreements. The occurrence of LV abnormalities was investigated via significant differences in contractility measurements (LVCQs, strains and torsions) between patients and healthy subjects. Results: Repeated measures analysis showed similarities between LVCQ measurements from DENSE and steady-state free precession, including cardiac output (4.7 ± 0.4 L, 4.6 ± 0.4 L, p = 0.8), and LV ejection fractions (59±6%, 58±5%, p = 0.2). Differences found between patients and healthy subjects included enlarged basal diameter (5.0 ± 0.5 cm vs 4.4 ± 0.5 cm, p < 0.01), apical torsion (6.0 ± 1.1° vs 9.7 ± 1.4°, p < 0.001) and global longitudinal strain (−0.15 ± 0.02 vs. -0.21 ± 0.04, p < 0.001), but not LV ejection fraction (59±6% vs. 63±6%, p = 0.1). Conclusion: The results from the statistical analysis reveal the possibility of LV abnormalities in the post-chemotherapy patients via enlarged basal diameter and reduced longitudinal strain and torsion, in comparison to healthy subjects. Advances in knowledge: This study shows that subclinical LV abnormalities in post-chemotherapy breast cancer patients can be detected with an automated technique for the comprehensive analysis of contractile parameters.
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Kar et al. (2019) conducted an observational in Breast cancer (post-chemotherapy) (n=42). Antineoplastic chemotherapy agents vs. Age-matched healthy females was evaluated on Global longitudinal strain (p=<0.001). Post-chemotherapy breast cancer patients showed subclinical left-ventricular abnormalities compared to healthy controls, including reduced global longitudinal strain (-0.15 vs -0.21; P<0.001).
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