Document Detail

Brain interstitial adenosine and sagittal sinus blood flow during systemic hypotension in piglet.
MedLine Citation:
PMID:  3192647     Owner:  NLM     Status:  MEDLINE    
We sampled, using the brain dialysis technique, interstitial fluid adenosine from the frontal cortex of newborn piglets subjected to hemorrhagic hypotension while measuring sagittal sinus blood flow, cerebrovascular resistance (CVR), and cerebral O2 delivery. In group 1 (n = 8), MABP was reduced in successive steps from 76 to 30 mm Hg with decrements of approximately 10 mm Hg. At 60 mm Hg, CVR decreased by 19% (p less than 0.001), but sagittal sinus blood flow and interstitial fluid adenosine remained unchanged. At 50 mm Hg, both sagittal sinus blood flow and CVR decreased by 19% (p less than 0.001) and interstitial fluid adenosine rose 4.7-fold (p less than 0.05). At 40 and 30 mm Hg, sagittal sinus blood flow decreased further but CVR remained steady, whereas interstitial fluid adenosine rose 10- and 16-fold, respectively. In group 2 (n = 7), an abrupt reduction of MABP from 80 to 47 mm Hg produced no change in sagittal sinus blood flow and a 29% decrease in CVR (p less than 0.01). Interstitial fluid adenosine increased twofold (p less than 0.01). In group 3 (n = 7), an abrupt reduction of MABP from 79 to 40 mm Hg decreased sagittal sinus blood flow and CVR by 24 and 30%, respectively (p less than 0.01). Interstitial fluid adenosine rose threefold (p less than 0.01). In groups 1, 2, and 3, the increases in interstitial fluid adenosine accompanied decreases in cerebral O2 delivery. In group 4 (n = 7), artificial CSF with a PO2 of 152 mm Hg was perfused through the brain dialysis cannula during graded hypotension.(ABSTRACT TRUNCATED AT 250 WORDS)
T S Park; D G Van Wylen; R Rubio; R M Berne
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism     Volume:  8     ISSN:  0271-678X     ISO Abbreviation:  J. Cereb. Blood Flow Metab.     Publication Date:  1988 Dec 
Date Detail:
Created Date:  1989-01-06     Completed Date:  1989-01-06     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8112566     Medline TA:  J Cereb Blood Flow Metab     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  822-8     Citation Subset:  IM    
Department of Neurological Surgery, University of Virginia School of Medicine, Charlottesville 22908.
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MeSH Terms
Adenosine / metabolism*
Animals, Newborn
Blood Pressure
Brain / metabolism,  physiopathology
Cerebrovascular Circulation*
Cranial Sinuses / physiopathology*
Extracellular Space / metabolism
Hypotension / metabolism*,  physiopathology
Oxygen / metabolism
Grant Support
Reg. No./Substance:
58-61-7/Adenosine; 7782-44-7/Oxygen

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