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ID 37822
file
creator
Kohata, Shuji
Ninomiya, Isio
Shinizu, Junichi
Furukawa, Kazuto
Matsuura, Yuichiro
subject
Renal nerve activity
Acute arterial bleeding
Aging
NDC
Medical sciences
abstract
We compared the change in renal sympathetic nerve activity (RNA) during hemorrhage in young and old rats. Young (10 weeks) and old (80 weeks) male Wistar rats were anesthetized, and RNA together with arterial pressure (AP) and heart rate (HR) were measured under spontaneous respiration. Acute arterial bleeding, lm1Jl00g body weight, was carried out to induce hypotension and hypovolemia. With bleeding, mean AP (MAP) decreased from 110 ± 12 to 23 ± 11mmHg (mean ± SEM) and from 93 ± 15 to 15 ± 6mmHg in young and old rats, respectively. The difference in the change of MAP between the young and old rats was not significant. With bleeding, mean RNA increased by 46 ± 21 % and 20 ± 16% in young and old rats, respectively. The increase in mean RNA of the old rats was significantly lower than that of the young rats. We estimated the gain of the barocepter-renal sympathetic nervous system by using the formula ∆RNA/RNA/∆MAP/MAP. The gain was 0.61 ± 0.34 and 0.23 ± 0.18 in young and old rats, respectively. The difference in the gain was statistically significant (p<0.05). We concluded that the gain of baroceptor-sympathetic nerve system in acute arterial hemorrhage is attenuated with aging.
journal title
Hiroshima Journal of Medical Sciences
volume
Volume 46
issue
Issue 3
start page
87
end page
92
date of issued
1997-09
publisher
Hiroshima University Medical Press
issn
0018-2052
ncid
language
eng
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biomedical Science
Graduate School of Health Science
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