Effects of PEEP on liver arterial and venous blood flows

Détails

ID Serval
serval:BIB_B1C6A8BC6870
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Effects of PEEP on liver arterial and venous blood flows
Périodique
American Journal of Respiratory and Critical Care Medicine
Auteur(s)
Brienza  N., Revelly  J. P., Ayuse  T., Robotham  J. L.
ISSN
1073-449X (Print)
Statut éditorial
Publié
Date de publication
08/1995
Volume
152
Numéro
2
Pages
504-10
Notes
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S. --- Old month value: Aug
Résumé
Total venous return decreases with positive end-expiratory pressure (PEEP). It is likely that the liver plays an important role in this response, either through the development of an increase in venous resistance or through an increase in the venous backpressure at the outflow end of the liver. In addition, hepatic arterial flow is reported to be selectively decreased by the application of PEEP. Therefore, to clarify the effects of PEEP on liver hemodynamics, we generated pressure-flow (P-Q) relationships in both liver vascular beds of anesthetized, mechanically ventilated pigs at PEEP of 0, 5, 10, and 15 cm H2O to obtain values of backpressure (Pback, mm Hg) from linear extrapolation of the P-Q relationships and resistance (mm Hg/ml/min/kg) from its slope. PEEP decreased portal vein flow (Qpv) and caused an increase in the liver venous resistance (from 0.08 +/- 0.01 to 0.16 +/- 0.02 mm Hg/ml/min/kg; p < 0.05). Ppvback and right atrial pressure (Pra) increased equally (from 5.1 +/- 0.3 to 9.9 +/- 0.4 mm Hg, p < 0.05, and from 4.0 +/- 0.2 to 8.6 +/- 0.5 mm Hg, p < 0.05, respectively, at PEEP 15). The reduction in portal venous flow was related to an increase in the backpressure to flow (as a result of an increase in Pra) and to an increase in liver venous resistances that may cause blood pooling in the splanchnic compartment and decrease venous return through the liver. PEEP increased Phaback (from 11.2 +/- 0.9 to 14.5 +/- 0.7 mm Hg at PEEP 15, p < 0.05) but did not change hepatic arterial resistance.(ABSTRACT TRUNCATED AT 250 WORDS)
Mots-clé
Animals Atrial Function, Right Blood Pressure Blood Volume Cardiac Output Female Hepatic Artery/*physiology Hepatic Veins/*physiology *Liver Circulation Plasma Substitutes/pharmacology Portal Pressure Portal Vein/physiology *Positive-Pressure Respiration Splanchnic Circulation Swine Vascular Resistance
Pubmed
Web of science
Création de la notice
24/01/2008 17:03
Dernière modification de la notice
20/08/2019 15:20
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