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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: BACKGROUND, METHODS, RESULTS. Meshes: Angioplasty, Animals, Biomarkers, Carotid Artery Injuries, Carotid Artery, Common, Carotid Stenosis, Disease Models, Animal, Endarterectomy, Carotid, Estradiol, Estrogen Replacement Therapy, Female, Homocysteine, Hyperhomocysteinemia, Hyperplasia, Infusion Pumps, Implantable, Jugular Veins, Ovariectomy, Rats, Rats, Sprague-Dawley, Time Factors, Tunica Intima.
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Does estrogen replacement attenuate exaggerated neointimal hyperplasia following carotid endarterectomy in rats? Context: To investigate whether estrogen may attenuate neointima formation in hyperhomocysteinemic rat carotid endarterectomy. Rats were divided into 6 groups: ovariectomized estradiol-treated homocysteine or chow; ovariectomized placebo-treated homocysteine or chow; intact placebo-treated homocysteine or chow. Chow served as controls while homocysteine served as exaggerated intimal hyperplasia. Prior to endarterectomy, rats were implanted with estradiol mini-pump or placebo, diets given 2 weeks before and after surgery. Homocysteine, estrogen, and neointimal hyperplasia were determined. Homocysteine was elevated in homocysteine groups versus controls except in estradiol-treated group. Intimal hyperplasia increased in placebo-treated ovariectomized homocysteine versus intact group. Exaggerated intimal hyperplasia in placebo-treated ovariectomized homocysteine was reduced by estrogen and so was homocysteine. Estrogen replacement in ovariectomized homocysteine group reduced intimal hyperplasia to that of intact or ovariectomized controls.
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Estradiol treatment in this ovariectomized hyperhomocysteinemia carotid endarterectomy and resultant attenuation of homocysteine and neointima may have relevance to the beneficial effects of estrogen on hyperplastic response. Final Decision: yes