The aim of the study---a comprehensive assessment of haemodynamic alterations during pneumonectomy using pulmonary arterial volumeter (PAV) opportunities. MATERIALS AND METHODS: 72 patients were included in the study, (the average age - 51 +/- 3,8 years, body weight - 68 +/- 7 kg), who underwent pneumonectomy about lung tumors under general anesthesia with separate ventilation (on indications - jet high-frequency ventilaton).