Professor B. V. Petrovsky at the Sechenov Institute of Experimental Thoracic Surgery is preparing for the operation: he washes his hands, ties a mask on his face. The moment of heart surgery. The operation is carried out by Professor G. M. Soloviev, advised by Professor B. V. Petrovsky. BV Petrovsky and GM Solovyov in the ward with children who underwent surgery. Surgeon V. I. Burakovsky in the room of physiotherapy exercises 1-st Gradsky hospital oversees the operated children performing exercises.