Document Detail

Application of electrocapacitography to investigation of cephalic and cerebral circulation in the rabbit.
MedLine Citation:
PMID:  2724664     Owner:  NLM     Status:  MEDLINE    
Electrocapacitography devised for medical purposes by Hatakeyama was applied as a noninvasive volumetric method to investigate circulation in the rabbit head and brain. The effective electric capacitance was measured by means of a highly sensitive device. An electrocapacitogram (ECPG) of the head, considered to reflect the volume of intracranial as well as extracranial blood vessels, varied rhythmically with cardiac beat and respiratory movement. In general, the pulsatile variations of ECPG in synchronization with cardiac beat (ECPG pulse) bore a resemblance to arterial pulse. Occlusion of the common carotid artery caused the ECPG level corresponding to mean vascular volume to fall markedly and in most cases the amplitude of ECPG pulse was diminished. By rapid infusion of 5 ml of the blood into intracranial blood vessels via the internal carotid artery or into extracranial blood vessels via the external carotid artery, ECPG level was raised transitorily, the effect of extracranial infusion being larger than that of intracranial infusion. Stimulation of the central cut end of the cervical sympathetic nerve reduced ECPG level considerably. This response was greatly diminished by carotid occlusion and sometimes a temporary rise of ECPG was observed at the beginning of the stimulation. In several cases the effect was reversed completely by carotid occlusion and an increase of ECPG during the stimulation was observed. These findings suggest the existence of a sympathetic vasoconstrictor in the head as well as a sympathetic vasodilator of the brain, although in confirmation of this review further investigation is required. ECPG of the head is demonstrated to be a useful method for investigating circulation in the head including brain.
I Hatakeyama; Z Simada
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Japanese journal of physiology     Volume:  39     ISSN:  0021-521X     ISO Abbreviation:  Jpn. J. Physiol.     Publication Date:  1989  
Date Detail:
Created Date:  1989-07-10     Completed Date:  1989-07-10     Revised Date:  2007-03-21    
Medline Journal Info:
Nlm Unique ID:  2985184R     Medline TA:  Jpn J Physiol     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  169-81     Citation Subset:  IM    
Department of Physiology, Kitasato University School of Medicine, Sagamihara, Japan.
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MeSH Terms
Brain / blood supply*
Cerebrovascular Circulation*
Electrophysiology / methods
Head / blood supply*

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