Document Detail


The effect of EGb-761 on morphologic vasospasm in canine basilar artery after subarachnoid hemorrhage.
MedLine Citation:
PMID:  12960685     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study investigated the effects of Ginkgo biloba extract (EGb-76l), an anti-oxidant and platelet-activating factor antagonist, on basilar artery vasospasm in an experimental canine subarachnoid hemorrhage model. Morphometric analyses were performed, and serum and cerebrospinal fluid endothelin-l levels were measured by radioimmunoassay. Comparisons were made between treated and untreated groups. Twenty-four mongrel dogs were randomly assigned to three groups. The animals in group 1 (n = 8) were not subjected to subarachnoid hemorrhage and received no treatment. In this group, serum and cerebrospinal fluid endothelin-l levels were measured daily for 8 days. On day 9, the animals were killed and their basilar arteries were excised for histopathological examination. In group 2 (n = 8), subarachnoid hemorrhage was produced using autologous arterial blood, and daily intravenous boluses of saline were administered for the next 8 days. Assessments of endothelin-l levels and the basilar arteries were performed as described for group 1. In group 3 (n = 8), subarachnoid hemorrhage was produced using autologous arterial blood, and daily intravenous boluses of EGb-761 were administered for 8 days. Endothelin-1 levels and the basilar arteries were assessed as described above. The groups' serum endothelin-1, cerebrospinal fluid endothelin-1, and histopathological findings were compared. In group 1, the serum and cerebrospinal fluid endothelin-1 levels did not change significantly over the 8 days, and histopathological examination of the basilar arteries revealed no abnormalities. In group 2, the serum and cerebrospinal fluid endothelin-1 levels increased abruptly and significantly on day 2, and remained high to the end of the study period (day 8). Histopathological examination revealed marked vasospasm. In group 3, the serum and cerebrospinal fluid endothelin-1 levels followed the same pattern observed in group 2; however, the arteries showed significantly less vasospasm than that observed in group 2. The study findings did not provide information about the mechanism of action of the platelet-activating factor-antagonist EGb-761, but they clearly show that this agent decreases morphologic vasospasm in the dog basilar artery.
Authors:
M Akif Bayar; Yavuz Erdem; Koray Oztürk; Omer Beşcalti; Muzaffer Caydere; Doğan Yücel; Zeki Buharali; Hüseyin Ustün
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of cardiovascular pharmacology     Volume:  42     ISSN:  0160-2446     ISO Abbreviation:  J. Cardiovasc. Pharmacol.     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-09-08     Completed Date:  2003-12-23     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  7902492     Medline TA:  J Cardiovasc Pharmacol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  395-402     Citation Subset:  IM    
Affiliation:
Department of Neurosurgery, Ankara Hospital, Ankara. firatbayer@hotmail.com
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MeSH Terms
Descriptor/Qualifier:
Animals
Basilar Artery / drug effects*,  pathology
Dogs
Endothelin-1 / blood*,  urine
Ginkgo biloba
Male
Plant Extracts / therapeutic use*
Platelet Activating Factor / antagonists & inhibitors*
Subarachnoid Hemorrhage / complications,  drug therapy*
Vasospasm, Intracranial / etiology,  pathology,  prevention & control*
Chemical
Reg. No./Substance:
0/Endothelin-1; 0/Ginkgo biloba extract 761; 0/Plant Extracts; 0/Platelet Activating Factor

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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