[The role of forces "vis a fronte" in the formation of venous return of blood to the heart].
Changes in venous return compared with changes in negative intrathoracic pressure at deep breathing and in right atrial pressure after the administration of pressure stimuli on the cardiovascular system were studied in acute experiments with anesthetized cats. No correlation was found between the value of negative intrathoracic pressure and the mean value of venous return or between the mean value of right atrial pressure and the mean value of venous return in the intact cardiovascular system provided the animal body is placed horizontally. It was concluded that both the negative intrathoracic pressure and the right atrial pressure are not the main factors influencing the venous return volume.
Tkachenko
B I
BI
Evlakhov
V I
VI
Poiasov
I S
IS
D000818:Animals; D002415:Cats; D003326:Coronary Circulation / Q000502:physiology*; D006321:Heart / Q000502:physiology*