[Cardiopulmonary interactions in patients under positive pressure ventilation].
Heart-lung interactions during positive-pressure ventilation are characterized by an extreme sensibility to the patient's intravascular volume status. Indeed, a fall in cardiac output due to decreased ventricular preload can be observed when initiating positive-pressure ventilation. This phenomenon is due to the close anatomic-functional association between heart and lungs, and to the fact that pulmonary volume and intrathoracic pressure variations cyclically modify heart-lung interactions. The present review address the questions of the physiological and physiopathological effects of positive-pressure ventilation on the right and left venous returns, and on pulmonary and systemic vascular resistances.
Bendjelid
K
K
Service des soins intensifs, hôpitaux universitaires de Genève, rue Micheli-du-Crest, 1211 Genève 14, Suisse. Karim.Bendjelid@hcuge.ch
Romand
J-A
JA
D003326:Coronary Circulation / Q000502:physiology*; D006321:Heart / Q000503:physiopathology; D006801:Humans; D008168:Lung / Q000098:blood supply / Q000503:physiopathology; D011175:Positive-Pressure Respiration; D011652:Pulmonary Circulation / Q000502:physiology*; D014655:Vascular Resistance