[Reaction of the cardiovascular and respiratory systems to physical exertion in secondary interatrial septal defects before and after surgical treatment].

Under similar conditions observations were performed in 157 humans: 9 patients with secondary defects of the interatrial septum (DIS-II), 122 patients within 1-15 years after surgery for the defect in question and 26 healthy humans. In addition to the known disturbances in hemodynamics of the small circulation circle accompanying DIS-II there were also disorders in the large blood circulation circle and respiration. The disorders were most pronounced under physical exercise.