The relationship between endothelin-1, event-related P300 potentials, and prognosis in cerebral arteriosclerosis.
OBJECTIVE
To search for a potential role of endothelin-1 (ET-1), a potent vasoconstrictor and presumably neurotoxic 21-amino acid peptide, for dysfunction of brain signal processing and cerebrovascular morbidity in nondemented patients with cerebral arteriosclerosis.


METHODS
Cross-sectional study with longitudinal follow-up.


METHODS
University-affiliated teaching hospital.


METHODS
A total of 106 nondemented patients with significant stenosis of either the internal carotid (cAD, cases; n = 63, mean age +/- SD, 62 +/- 7 years) or peripheral arteries (pAD, disease controls; n = 43, 60 +/- 11 years) were investigated before carotid endarterectomy and bypass surgery, respectively. After a mean follow-up of about 19 months, cerebrovascular morbidity of the cAD and pAD patients was evaluated by phone.


METHODS
Brain signal processing functions by event-related visual P300 potentials; cerebrovascular events by a structured telephone interview; the extent of arteriosclerosis by venous ET-1 concentration.


RESULTS
Venous ET-1 levels were elevated in both cAD and pAD patient groups, but to the same degree. In these patients, ET-1 concentration was correlated slightly with diastolic blood pressure (r = .334, P = .0326, stepwise regression). Only in cAD patients with ET-1 levels above the 75th percentile were P300 latencies markedly prolonged compared with their lower ET-1 level counterparts. Furthermore, the P300 latencies of the cAD patients, but not of the pAD patients, correlated positively with venous ET-1 concentration and inversely with pack years of smoking (r = .728, P = .0002; stepwise regression). In contrast to base-line P300 abnormalities and classical risk factors (e.g., hypertension), high ET-1 levels predicted an increased cerebrovascular morbidity of cAD, but not of pAD, patients (P = .0044; Mantel Cox test).


CONCLUSIONS
In nondemented patients with cerebral arteriosclerosis, endothelin-1 is associated with P300 abnormalities reflecting subclinical dysfunction of brain signal processing. In the long-term, high venous ET-1 levels also appear to predict a higher cerebrovascular morbidity of cAD patients even after carotid endarterectomy.
Kügler
C F
CF
University of Erlangen-Nürnberg, Germany.
Funk
H
H
Vlajic
P
P
Platt
D
D
D000368:Aged; D016893:Carotid Stenosis / Q000097:blood / Q000150:complications / Q000503:physiopathology / Q000601:surgery; D003430:Cross-Sectional Studies; D016894:Endarterectomy, Carotid; D019332:Endothelin-1 / Q000097:blood*; D018913:Event-Related Potentials, P300; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D002537:Intracranial Arteriosclerosis / Q000097:blood / Q000150:complications / Q000401:mortality / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D016019:Survival Analysis
D019332:Endothelin-1