[Functional state of the remaining lung following pneumonectomy].

The investigation performed has revealed moderate pulmonary hypertension associated with adaptation of the organism to changed conditions of blood circulation in the lungs. Greatly elevated pressure in the lung artery in response to physical exercise allowed to make a conclusion of practically complete mobilization of compensatory reserves of the right portion of the heart. The changes in the functional state of the remaining lung are evaluated as compensatory ones aimed at the maintenance of a sufficient square surface for gas exchange.