Document Detail

Transcranial Doppler findings during balloon test occlusion of the internal carotid artery.
MedLine Citation:
PMID:  10436757     Owner:  NLM     Status:  MEDLINE    
The authors performed transcranial Doppler ultrasonography (TCD) during internal carotid artery (ICA) balloon test occlusion (BTO) and observed changes in mean flow velocity (Vm) in the middle cerebral artery (MCA), and pulsatility index (PI) while monitoring the stump pressure (Sp) of the internal carotid artery (ICA), and neurologic findings. A group of 17 patients requiring possible temporary or permanent occlusion of the ICA in the course of planned procedures first underwent BTO. A patient who either developed neurologic changes or maintained less than 60% of preocclusion Sp or Vm in the ipsilateral MCA during BTO was considered to have a positive test. Eleven patients had negative results, while in six patients, tests were positive. Mean flow velocity showed a decrease after occlusion in all cases but not to a remarkable extent in some patients. Stump pressure decreased in all negative cases after balloon inflation and than tended to increase progressively during 15 minutes of BTO. Pulsatility index tended to decrease gradually during BTO in all negative patients. However, in positive cases, PI and Sp fell steeply. Only one positive case had a neurologic symptom of severe headache. The decreased PI in the MCA reflected autoregulatory dilation of cerebral vessels to compensate for decreased absolute cerebral blood volume following ICA occlusion. Changes in PI are a good indicator for evaluating blood flow during BTO.
A K Bhattacharjee; N Tamaki; T Wada; Y Hara; K Ehara
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of neuroimaging : official journal of the American Society of Neuroimaging     Volume:  9     ISSN:  1051-2284     ISO Abbreviation:  J Neuroimaging     Publication Date:  1999 Jul 
Date Detail:
Created Date:  1999-09-02     Completed Date:  1999-09-02     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9102705     Medline TA:  J Neuroimaging     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  155-9     Citation Subset:  IM    
Department of Neurosurgery, Kobe University School of Medicine, Japan.
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MeSH Terms
Balloon Dilatation
Blood Flow Velocity
Carotid Artery, Internal
Carotid Stenosis / etiology,  physiopathology,  ultrasonography*
Cerebrovascular Circulation / physiology
Middle Aged
Pulsatile Flow
Ultrasonography, Doppler, Transcranial*

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