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• W2169367129 endingPage "R674" @default.
• W2169367129 startingPage "R665" @default.
• W2169367129 abstract "Sympathetic nerve activity (SNA) consists of discharges that vary in amplitude and frequency, reflecting the level of recruitment of nerve fibers and the rhythmic generation and entrainment of activity by the central nervous system. It is unknown whether selective changes in these amplitude and frequency components account for organ-specific changes in SNA in response to alterations in blood volume or for the impaired SNA responses to volume changes in heart failure (HF). To address these questions, we measured cardiac SNA (CSNA) and renal SNA (RSNA) simultaneously in conscious, normal sheep and sheep in HF induced by rapid ventricular pacing. Volume expansion decreased CSNA (−62 ± 10%, P < 0.05) and RSNA (−59 ± 10%, P < 0.05) equally ( n = 6). CSNA decreased as a result of a reduction in burst frequency, whereas RSNA fell because of falls in burst frequency and amplitude. Hemorrhage increased CSNA (+74 ± 9%, P < 0.05) more than RSNA (+21 ± 5%, P < 0.09), in both cases because of increased burst frequency, whereas burst amplitude decreased. In HF, burst frequency of CSNA (from 26 ± 3 to 75 ± 3 bursts/min) increased more than that of RSNA (from 63 ± 4 to 79 ± 4 bursts/min). In HF, volume expansion caused no change in CSNA and an attenuated decrease in RSNA, due entirely to decreased burst amplitude. Hemorrhage did not significantly increase SNA in either nerve in HF. These findings support the concept that the number of sympathetic fibers recruited and their firing frequency are controlled independently. Furthermore, afferent stimuli, such as changes in blood volume, cause organ-specific responses in each of these components, which are also selectively altered in HF." @default.
• W2169367129 created "2016-06-24" @default.
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• W2169367129 date "2009-09-01" @default.
• W2169367129 modified "2023-09-27" @default.
• W2169367129 title "Discharge properties of cardiac and renal sympathetic nerves and their impaired responses to changes in blood volume in heart failure" @default.
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• W2169367129 doi "https://doi.org/10.1152/ajpregu.00191.2009" @default.
• W2169367129 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2739785" @default.
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