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Effects of hemorrhage on gastrointestinal oxygenation.

Abstract：

OBJECTIVES:(1) To demonstrate that metabolic parameters are better indicators of tissue hypoxia than regional and whole oxygen consumption (VO(2)). (2) To compare intramucosal pH (pHi) in different gastrointestinal segments. DESIGN:Prospective, interventional study. SETTING:Research laboratory at a university center. SUBJECTS:Fourteen anesthetized, mechanically ventilated dogs. INTERVENTIONS:Twenty milliliters per kilogram bleeding. MEASUREMENTS AND MAIN RESULTS:We placed pulmonary, aortic and mesenteric venous catheters, and an electromagnetic flow probe in the superior mesenteric artery, and gastric, jejunal and ileal tonometers to measure flows, arterial and venous blood gases and lactate, and intramucosal PCO(2). We calculated systemic and intestinal oxygen transport (DO(2)) and consumption (VO(2)), pHi and arterial minus intramucosal PCO(2) (DeltaPCO(2)). Then, we bled the dogs and repeated the measurements after 30 min. Systemic and intestinal DO(2) fell (26.0+/-7.3 versus 8.9+/-2.6 and 71.9+/-17.3 versus 24.6+/-9.6 ml/min per kg, respectively, p<0.0001). Systemic and intestinal VO(2) remained unchanged (5.5+/-1.3 versus 5.4+/-1.3 and 15.7+/-5.0 versus 14.9+/-5.3 ml/min per kg, respectively). Gastric, jejunal and ileal pHi (7.13+/-0.11 versus 6.96+/-0.17, 7.18+/-0.06 versus 6.97+/-0.15, 7.12+/-0.11 versus 6.94+/-0.14, p<0.05) and DeltaPCO(2) (21+/-13 versus 35+/-23, 15+/-5 versus 33+/-16, 23+/-17 versus 38+/-20, p<0.05) changed accordingly. Arterial and mesenteric venous lactate and their difference, rose significantly (1.7+/-0.9 versus 3.7+/-1.4 and 1.8+/-0.8 versus 4.3+/-1.5 mmol/l, 0.1+/-0.6 versus 0.6+/-0.7 mmol/l, p<0.05). CONCLUSIONS:During hemorrhage, systemic and intestinal VO(2) remained stable. However, hyperlactatemia and intramucosal acidosis evidenced anaerobic metabolism. pHi changes paralleled in the three intestinal segments.

journal_name

Intensive Care Med

journal_title

Intensive care medicine

authors

Dubin A,Estenssoro E,Murias G,Canales H,Sottile P,Badie J,Barán M,Pálizas F,Laporte M,Rivas Díaz M

doi

10.1007/s00134-001-1138-9

keywords:

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

1931-6

issue

12

eissn

0342-4642

issn

1432-1238

journal_volume

27

pub_type

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