“…In children with ALL at different stages of polychemotherapy, various clinical symptoms (arterial dystonia, cardialgia, functional systolic murmur, etc.) and electrocardiographic signs of cardiovascular disorders were identified, characterized at the onset of the disease by nomotopic disorders of automaticity, recorded in 21.0% of cases by the predominance of process disorders repolarization in the LV myocardium during therapy and after its completion in 63.0% and 48.0% of cases, respectively [3].…”