[The problem of follow-up period after Fontan operation].

The study was designed to analyse the frequency and structure of complications after Fontan operation depending on the form of congenital heart failure (CHF), method of surgery, patients' clinical and hemodynamic characteristics in the preoperative period. Results of surgical and endovascular treatment of different complications and strategies of conservative therapy are discussed. The most common complications of Fontan surgery were circulatory failure, disturbances of heart rhythm, and protein-losing enteropathy. In the majority of patients, they developed in the first 2-3 years after surgery.