Left atrial function in children and young adult cancer survivors treated with anthracyclines

BackgroundThe left atrium (LA) modulates left ventricular filling pressure and is a strong prognosticator in heart failure. Although anthracycline exposure may lead to impaired left ventricular (LV) function, the effects on LA function are not well-described in the younger population. We aim to evaluate LA function in children exposed to anthracyclines. MethodsChildren exposed to anthracyclines with pre- and post-treatment echocardiographic imaging were enrolled. Measures of LA function (LA ejection fraction [LA EF], global longitudinal strain [GLS], and peak GLS rate) were quantified using 2D speckle tracking echocardiography pre- and post-anthracycline therapy and were compared. Segments with poor tracking were excluded. ResultsFifty-five children (age 13 [SD 5] years) treated with anthracyclines were evaluated. LA EF, GLS, and peak GLS rate were lower after anthracycline exposure. Mean changes were as follows: LA EF (pre-73.5 [SD 7.7]% vs post-70.6 [SD 8.2]%, P=0.06), GLS (-34.2 [SD 8.4]% vs -31.9 [SD 7.1]%, P=0.09), peak GLS rate (2.2 [SD 0.8]s(-1) vs 2.0 [SD 0.6]s(-1), P=0.18). When stratified by pre- (12years old) vs post-puberty (>12years old), prepubescent patients (n=21) had statistically significant changes in pre/post LA GLS (P=0.01) and LA EF (P=0.01). In models adjusted for radiation dose, age, gender, body surface area, or cumulative anthracycline dose, there were no significant relationships in the absolute difference between pre/post LA EF (P=0.34) or LA GLS (P=0.18). ConclusionsIn children exposed to anthracyclines, short-term effects on LA function were minimal in those with preserved LV EF. Age-dependent LA susceptibility to anthracycline requires further study.