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Cerebral Hemodynamics, Oxygen Uptake and Cerebral Arteriovenous Differences of Catecholamines Following E. coli Endotoxin in Dogs
Author(s) -
EkströmJodal B.,
Häggendal J.,
Larsson L. E.,
Westerlind A.
Publication year - 1982
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1982.tb01797.x
Subject(s) - medicine , arteriovenous oxygen difference , hemodynamics , anesthesia , oxygen , cardiology , blood pressure , stroke volume , heart rate , chemistry , organic chemistry
In experimental endotoxic shock in dogs, a decrease in cerebral blood flow and an increase in cerebral metabolic rate of oxygen (CMRo 2 ) have been shown to occur. In this situation the blood levels of adrenaline and noradrenaline are markedly elevated. The aim of the present study was to investigate whether a cerebral uptake of circulating catecholamines with a possible influence on CMRo 2 takes place in the brain. In eight anaesthetized dogs, arterial blood, superior sagittal sinus blood and cerebrospinal fluid were analysed for the concentrations of adrenaline, noradrenaline and dopamine before and up to 4 h after an injection of E. coli endotoxin 1.0–1.5 mg·kg ‐1 . The blood levels of adrenaline and noradrenaline, but not dopamine, increased in response to the endotoxin. From about 30 min after the endotoxin injection, arteriovenous adrenaline and noradrenaline differences indicating a cerebral uptake were most often seen. Increased concentrations of noradrenaline, adrenaline and dopamine in cerebrospinal fluid were observed. Noradrenaline gave the highest concentrations and these were correlated to the CMRo 2 . In some animals the blood and cerebrospinal fluid concentrations of adrenaline seemed to be related. These results indicate that catecholamines might be of importance for the development of an increased CMRo 2 in endotoxic shock.