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Cerebral blood flow, haematocrit and viscosity in subjects with a high oxygen affinity haemoglobin variant
Author(s) -
Wade J. P. H.,
Boulay G. H.,
Marshall John,
Pearson T. C.,
Ross Russell R. W.,
Shirley J. A.,
Symon L.,
WetherleyMein G.,
Zilkha E.
Publication year - 1980
Publication title -
acta neurologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.967
H-Index - 95
eISSN - 1600-0404
pISSN - 0001-6314
DOI - 10.1111/j.1600-0404.1980.tb01485.x
Subject(s) - polycythaemia , cerebral blood flow , blood viscosity , hyperviscosity , blood flow , hematocrit , medicine , oxygen , cardiology , anesthesia , endocrinology , chemistry , organic chemistry
The cerebral blood flow is low in primary polycythaemia, and it has been suggested that this is due to the increase in viscosity which accompanies the elevated haematocrit. In the present study cerebral blood flow has been measured by a non‐invasive 133 Xenon technique in six subjects with an elevated haematocrit secondary to a haemoglobin variant with increased oxygen affinity. Flow was significantly higher than normal and 81 % higher than in 11 subjects of comparable age, matched for haematocrit and viscosity, but without the haemoglobin variant. In patients with this unusual type of polycythaemia, cerebral blood flow is high despite the elevated blood viscosity and the implications of these results are discussed.