Cerebral blood flow following normovolemic hemodilution in patients with high hematocrit.

Abstract:

:The effects on cerebral hemodynamics of venisection and a 4% albumin-saline infusion were studied in six patients with high hematocrit (mean, 51.5%). Cerebral blood flow (CBF) was measured using the xenon 133 intracarotid injection method. Blood gases were measured in arterial and jugular venous blood. Rapid two-stage hemodilution, which lowered mean hematocrit by 9 and 13%, resulted in CBF increases of 19 and 23%, respectively. Jugular venous partial pressure of oxygen and oxygen delivery capacity (CBF x arterial oxygen content) did not change significantly from baseline. The cerebral metabolic rate for oxygen increased slightly following stage 1 hemodilution but returned to baseline value following stage 2. The study lends no support to the concept that patients whose hematocrit is at the high end of the normal range have generalized cerebral hypoxia.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Henriksen L,Paulson OB,Smith RJ

doi

10.1002/ana.410090507

subject

Has Abstract

pub_date

1981-05-01 00:00:00

pages

454-7

issue

5

eissn

0364-5134

issn

1531-8249

journal_volume

9

pub_type

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