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CSI is part of the treatment of CNS tumors and is associated with cardiovascular disease; data in pediatric/young-adult patients are limited. Myocardial-strain-analysis can reveal subclinical dysfunction. Retrospective, single-center study in CNS tumor patients managed with CSI from 1986–2018. Clinical details, and echocardiography including myocardial-strain-analysis were collected at T1=first echocardiogram after CSI, and T2=most recent echocardiogram. Data are mean±standard deviation. Echocardiograms were available in 44 patients (36%female, 14±8.0years) at T1 and 39 patients (38%female, 21.0±11.3years) at T2. Standard echocardiography was normal for all subjects. At T1, global longitudinal peak systolic strain (GLS) was -16.3%±3.7% in CSI vs. -21.6%±3.5% in controls (p&amp;lt;0.0001); global radial peak systolic strain (GRS) was 21.5%±10.1% in CSI vs. 26.5%±7.4% in controls, and global circumferential peak systolic strain (GCS) was -19.5%±6.0% in CSI vs. -21.4%±3.4% in controls (p&amp;lt;0.05, both comparisons). At T2, GLS was -15.8%±5.2% in CSI vs. -21.9±3.5% in controls (p&amp;lt;0.0001); GRS was 22.6%±10.4% in CSI vs. 27.1±8.2% in controls (p&amp;lt;0.05); GCS was -20.5%±6.9% in CSI vs. -21.8±3.5% in controls (p=0.10). For 17 patients with myocardial-strain-analysis available for both time points: difference in GLS was 0.06±7.2% (p&amp;gt;0.95); GRS was 5.5±9.5% (p&amp;lt;0.05); GCS was -3.4±4.9% (p&amp;lt;0.05). Subclinical dysfunction is present at first echocardiogram after CSI. Myocardial impairment may recover with time, however further analysis is needed to identify risk factors and trends. These results argue for inclusion of baseline cardiovascular assessment and longitudinal follow-up in CNS tumor patients post CSI.

neuro-oncology

RONC-31. ADVANCED ECHOCARDIOGRAPHY WITH MYOCARDIAL-STRAIN-ANALYSIS DESCRIBES SUBCLINICAL CARDIAC DYSFUNCTION AFTER CRANIOSPINAL IRRADIATION (CSI) IN PEDIATRIC AND YOUNG ADULT PATIENTS WITH CENTRAL NERVOUS SYSTEM (CNS) TUMORS