Cardiovascular magnetic resonance can detect occult anthracycline cardiotoxicity in adolescents and young adults cancer survivors with normal ejection fraction
Journal of Cardiovascular Magnetic Resonance volume 18, Article number: Q42 (2016)
Risk stratification and early monitoring of anthracycline-induced cardiotoxicity is crucial. It has been shown that early histopathological changes occur well before myocardial functional abnormalities can be detected. Additionally a long period of latency with clinical recovery of systolic function before the development of overt heart failure has been described, further emphasizing the importance of early recognition of cardiac injury and defining routine follow-up.
Long-term childhood cancer survivors were prospectively recruited after written informed consent. Study protocol was approved by the institutional review board. Subjects underwent a cardiovascular magnetic resonance (CMR) study on a 1.5 Tesla scanner (Philips, Best, Netherlands) with routine cine acquisition in long and short axis planes, tissue characterization with native T1 mapping and late gadolinium enhancement (LGE), selected 2D phase contrast flow imaging and 3D whole heart anatomy. Ventricular volumes, mass, and ejection fraction (EF) were obtained via standard planimetry techniques using a semiautomated commercial software (CMRtools, Imperial College, London, United Kingdom). Myocardial and left atrial (LA) strain parameters were derived from balanced SSFP cine images using dedicated software (TomTec Imaging Systems, 2D CPA MR, Cardiac Performance Analysis, Version 184.108.40.206, Unterschleissheim, Germany). LA reservoir, conduit and contractile functions were then quantified by both fractional volume changes and CMR feature tracking derived strain and strain rate. Transit times for pulse wave velocity (PWV) computations were determined using the foot-to-foot methodology.
Twenty patients (mean age 18 ± 2 years) were enrolled. Twenty age-matched healthy controls (p = 0.109) were also recruited for comparison. Patients were studied after a mean anthracycline cumulative dose of 207 mg/m2, 83 months on average post-exposure. There was no significant difference between both groups in terms of volumetric analysis (table 1), with both presenting no areas of myocardial LGE. Left ventricular deformation parameters (but not LA functional indices) such as global radial strain (GRs) and strain rate (GRSr), global circumferential strain (GCs) and strain rate (GCSr), native T1 and PWV were significantly different among the two groups on both bivariate and multivariate regression analysis (p <0.001 to 0.035). GRSr (early diastole), GCSr (systole), PWV and native T1 outperform other imaging biomarkers (figure 1) in the assessment of subtle myocardial and vascular changes post-chemotherapy.
CMR can detect subtle myocardial and vascular abnormalities in young cancer survivors with normal EF exposed to anthracycline chemotherapy in the months following exposure. CMR may provide the short term markers of future cardiac morbidity necessary to design safer treatment regimens for younger cancer survivors.
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Vieira, M.S., Rafiq, I., Figueroa, A.C. et al. Cardiovascular magnetic resonance can detect occult anthracycline cardiotoxicity in adolescents and young adults cancer survivors with normal ejection fraction. J Cardiovasc Magn Reson 18 (Suppl 1), Q42 (2016). https://doi.org/10.1186/1532-429X-18-S1-Q42