Tissue acid-base balance and oxygen metabolism in human cerebral infarction studied with positron emission tomography.

Abstract:

:Nine patients who had suffered strokes were examined between 10 and 34 days after onset using positron emission tomography. DMO labeled with carbon 11 was used to evaluate brain acid-base balance, and the oxygen-15 inhalation technique was used to measure regional cerebral blood flow, the oxygen extraction fraction, and cerebral metabolic rate for oxygen. [11C]DMO concentration and oxygen metabolism variables were measured in the infarcted area and in the symmetrical region in the contralateral cerebral hemisphere. [11C]DMO concentration was found to be unchanged or slightly increased in five cases and markedly increased in four cases. The apparent increase in tissue pH can be explained by the presence of a large extracellular fluid space with a pH nearly identical to that of brain plasma, or by an increase in intracellular pH, or by both phenomena. The change in [11C]DMO concentration in the infarcted area relative to that in the normal tissue was independent of the change in blood flow. Cerebral metabolic rate for oxygen was decreased in all cases. The increase in [11C]DMO concentration in the infarcted area was linearly correlated with the decrease in the oxygen extraction fraction in the same region; that is, it was correlated with the occurrence of perfusion in excess of metabolic demand. The overabundant local perfusion could play a role in the decreased H+ content.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Syrota A,Castaing M,Rougemont D,Berridge M,Baron JC,Bousser MG,Pocidalo JJ

doi

10.1002/ana.410140405

subject

Has Abstract

pub_date

1983-10-01 00:00:00

pages

419-28

issue

4

eissn

0364-5134

issn

1531-8249

journal_volume

14

pub_type

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