[Dynamics of the venous circulation in the cosmonauts of the 2d "Saliut-4" expedition]

During the first month of the orbital flight the cosmonauts showed an increase in the blood pressure and filling in the jugular veins whereas during the second month they exhibited a decrease in these parameters below the preflight level. Throughout the mission the pressure in the pulmonary artery remained slightly increased. The time of contractions of the right heart changed. The changes in the blood pressure and filling in the jugular veins can be explained by blood pooling there and subsequent extravasation of blood into the abdominal cavity.