Acute congestive heart failure in children is a clinical syndrome characterized by a sudden impairment of systemic blood flow as a result of decreased myocardial contractility. Acute heart failure can occur as a complication of infectious-toxic and allergic diseases, acute exogenous poisoning, myocarditis, cardiac arrhythmias, as well as rapid decompensation of chronic heart failure, usually in children with congenital and acquired heart defects, cardiomyopathies, arterial hypertension.