کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5829765 | 1559002 | 2012 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Exacerbation of myocardial dysfunction and autonomic imbalance contributes to the estrogen-dependent chronic hypotensive effect of ethanol in female rats
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب سلولی و مولکولی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Exacerbation of myocardial dysfunction and autonomic imbalance contributes to the estrogen-dependent chronic hypotensive effect of ethanol in female rats Exacerbation of myocardial dysfunction and autonomic imbalance contributes to the estrogen-dependent chronic hypotensive effect of ethanol in female rats](/preview/png/5829765.png)
چکیده انگلیسی
Our previous studies showed that the hypotensive effect of chronic ethanol in female rats is reduced by ovariectomy (OVX) rats and was restored after estrogen replacement (OVXE2). Further, in randomly cycling rats, chronic ethanol increased cardiac parasympathetic dominance and subsequently reduced myocardial contractility and blood pressure (BP). In this study, we tested the hypothesis that alterations in myocardial contractility and sympathovagal control account for the E2 exacerbation of the hemodynamic effects of ethanol. BP, myocardial contractility (+Â dP/dtmax), and spectral cardiovascular autonomic profiles were evaluated in radiotelemetered OVX, and OVXE2 rats receiving liquid diet with or without ethanol (5%, w/v) for 13Â weeks. In OVX rats, ethanol caused modest hypotension along with significant increases in +Â dP/dtmax during weeks 2-5. The high-frequency (IBIHF, 0.75-3Â Hz) and low-frequency (IBILF, 0.25-0.75Â Hz) bands of interbeat intervals were briefly increased and decreased, respectively, by ethanol. Compared with its effects in OVX rats, chronic treatment of OVXE2 rats with ethanol elicited significantly greater and more sustained reductions in systolic (SBP) and diastolic (DBP) blood pressures and +Â dP/dtmax. Altered sympathovagal balance and parasympathetic overactivity were more evident in ethanol-treated OVXE2 rats as suggested by the sustained: (i) increases in high-frequency bands of interbeat intervals (IBIHF, 0.75-3Â Hz), and (ii) decreases in low-frequency IBI bands (IBILF, 0.25-0.75Â Hz), IBILF/HF ratio and +Â dP/dtmax. The plasma ethanol concentration was not affected by changes in the hormonal milieu. These findings suggest that estrogen exacerbates the ethanol-evoked reductions in myocardial contractility and BP and the associated parasympathetic overactivity in female rats.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Pharmacology - Volume 679, Issues 1â3, 15 March 2012, Pages 95-100
Journal: European Journal of Pharmacology - Volume 679, Issues 1â3, 15 March 2012, Pages 95-100
نویسندگان
Mahmoud M. El-Mas, Abdel A. Abdel-Rahman,