OBJECTIVE: pCO(2) gradients are used for the assessment of splanchnic regional and local mucosal blood flow changes in experimental and clinical research. pCO(2) gradients may not parallel blood flow changes because of concomitant changes in metabolism, hemoglobin, temperature, and the Haldane effect. DESIGN AND SETTING: A randomized, controlled animal experiment in a university experimental research laboratory. INTERVENTIONS: An extracorporeal shunt with reservoir and roller pump was inserted between the proximal and the distal abdominal aorta in 16 pigs. In animals randomized to the low-flow group ( n=8) splanchnic perfusion was reduced by running the roller pump. At baseline and after 45 min of stable shunt flow superior mesenteric artery, celiac trunk, spleen artery, and portal vein blood flows and regional venous-arterial and jejunal and gastric mucosal-arterial pCO(2) gradients were measured, and the respective regional O(2) consumption rates (VO(2)) calculated. MEASUREMENTS AND RESULTS: In the low-flow group all regional blood flows and the associated VO(2) decreased to roughly 50% of baseline values, and hemoglobin decreased from 7.3 (4.4-9.6) g/dl to 5.7 (4.1-8.9) g/dl. Decreasing regional blood flows were consistently associated with increasing regional and mucosal pCO(2) gradients. CONCLUSIONS: During isolated reduction in abdominal aortic blood flow there is no preferential distribution to any splanchnic vascular bed and changes in regional pCO(2) gradients reflect consistently the associated blood blow changes.
OBJECTIVE:pCO(2) gradients are used for the assessment of splanchnic regional and local mucosal blood flow changes in experimental and clinical research. pCO(2) gradients may not parallel blood flow changes because of concomitant changes in metabolism, hemoglobin, temperature, and the Haldane effect. DESIGN AND SETTING: A randomized, controlled animal experiment in a university experimental research laboratory. INTERVENTIONS: An extracorporeal shunt with reservoir and roller pump was inserted between the proximal and the distal abdominal aorta in 16 pigs. In animals randomized to the low-flow group ( n=8) splanchnic perfusion was reduced by running the roller pump. At baseline and after 45 min of stable shunt flow superior mesenteric artery, celiac trunk, spleen artery, and portal vein blood flows and regional venous-arterial and jejunal and gastric mucosal-arterial pCO(2) gradients were measured, and the respective regional O(2) consumption rates (VO(2)) calculated. MEASUREMENTS AND RESULTS: In the low-flow group all regional blood flows and the associated VO(2) decreased to roughly 50% of baseline values, and hemoglobin decreased from 7.3 (4.4-9.6) g/dl to 5.7 (4.1-8.9) g/dl. Decreasing regional blood flows were consistently associated with increasing regional and mucosal pCO(2) gradients. CONCLUSIONS: During isolated reduction in abdominal aortic blood flow there is no preferential distribution to any splanchnic vascular bed and changes in regional pCO(2) gradients reflect consistently the associated blood blow changes.
Authors: A Dubin; E Estenssoro; G Murias; H Canales; P Sottile; J Badie; M Barán; F Pálizas; M Laporte; M Rivas Díaz Journal: Intensive Care Med Date: 2001-11-10 Impact factor: 17.440
Authors: Arnaldo Dubin; Gastón Murias; Elisa Estenssoro; Héctor Canales; Julio Badie; Mario Pozo; Juan P Sottile; Marcelo Barán; Fernando Pálizas; Mercedes Laporte Journal: Crit Care Date: 2002-08-28 Impact factor: 9.097
Authors: Edward Abraham; Peter Andrews; Massimo Antonelli; Laurent Brochard; Christian Brun-Buisson; Geoffrey Dobb; Jean-Yves Fagon; Johan Groeneveld; Jordi Mancebo; Philipp Metnitz; Stefano Nava; Michael Pinsky; Peter Radermacher; Marco Ranieri; Christian Richard; Robert Tasker; Benoit Vallet Journal: Intensive Care Med Date: 2004-06-26 Impact factor: 17.440
Authors: Jacques Creteur; Daniel De Backer; Yasser Sakr; Marc Koch; Jean-Louis Vincent Journal: Intensive Care Med Date: 2006-02-17 Impact factor: 17.440