Influence of changes in intrathoracic and central venous pressure on cardiac filling dynamics.
Changes in the ratio between intrathoracic and central venous pressure were studied in narcotized cats under conditions of constant positive or negative pressure ventilation. Transformation of elastic characteristics in the respiratory system caused by changes in intrathoracic pressure led to inversion of the ratio between transpulmonary intrathoracic and central venous pressure determining right atrial filling pressure.
Donina
Zh A
ZhA
Laboratory for Physiology of Respiration, I P Pavlov Institute of Physiology, Russian Academy of Sciences, St Petersburg, Moscow. isaev@kolt.infra.ru
Lavrova
I N
IN
Tikhonov
M A
MA
Kotov
A N
AN
Kolesnikov
V I
VI
Baranov
V M
VM
D000818:Animals; D016280:Atrial Function, Right / Q000502:physiology*; D017536:Carotid Artery, Common / Q000502:physiology; D002415:Cats; D002496:Central Venous Pressure; D004562:Electrocardiography; D010991:Plethysmography; D011175:Positive-Pressure Respiration; D015656:Respiratory Mechanics / Q000502:physiology*; D013909:Thorax / Q000098:blood supply*; D014683:Vena Cava, Superior / Q000502:physiology