Modified thermal diffusion flow probe for the continuous monitoring of cortical blood flow.
Neurosurgery
; 29(4): 583-9, 1991 Oct.
Article
em En
| MEDLINE
| ID: mdl-1944841
ABSTRACT
A small thermal diffusion flow probe has been developed to monitor the dynamic changes in cerebral blood flow in small animals. Constantan wire was used as a heat source to make a miniature probe. The pair of thermocouples used to detect the heat gradient between two gold plates was elongated to avoid heat conduction between them, and this improvement allowed us to make quantitative measurements. After several basic experiments, local cerebral blood flow was measured simultaneously, using both the modified thermal probe and the hydrogen clearance method in four rabbits. A close relationship was obtained between the local cerebral blood flow values measured by hydrogen clearance (F, ml/100g/min) and the reciprocal of the thermocouple voltage (1/V;1/mV). The regression line was F = 29111(1/V - 1/226), (r = 0.92, P less than 0.001). We suggest that the modified thermal probe is a reliable and quantitative means of measuring flow. In addition, another probe modified for clinical use was evaluated. Continuous monitoring of local cerebral blood flow in postoperative patients was performed, and some illustrative cases are described.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Circulação Cerebrovascular
Tipo de estudo:
Prognostic_studies
Limite:
Aged
/
Animals
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Neurosurgery
Ano de publicação:
1991
Tipo de documento:
Article
País de afiliação:
Japão