Analysis of circadian blood pressure rhythm and target-organ damage in stroke-prone spontaneously hypertensive rats.

Abstract:

OBJECTIVE:We compared diurnal patterns of blood pressure in Wistar-Kyoto (WKY) rats, spontaneously hypertensive rats (SHR) and stroke-prone spontaneously hypertensive rats (SHRSP), and analyzed the relationship between the change in diurnal patterns of blood pressure and target-organ damage in SHRSP. MATERIALS AND METHODS:Blood pressure, heart rate and motor activity in the three groups of rats were continuously monitored by radiotelemetry, from 1100 h on the first measuring day to 1300 h on the third measuring day. The left ventricular weight and the ratio of beta-myosin heavy chain to alpha-myosin heavy chain in the cardiac left ventricle, morphological changes in the glomerular basement membrane in the kidney, 24 h urinary protein excretion and brain weights were also measured in 10-, 12- or 17-week-old SHRSP. RESULTS:The SHR circadian blood pressure rhythm exhibited a pattern which peaked during the rats' active (light-off or dark) phase, but the peak time was a little closer to the resting (light-on) phase compared with that for WKY rats. Although the circadian blood pressure rhythm for 10-week-old SHRSP was similar to that observed for SHR, the patterns in 12- and 17-week-old SHRSP were shifted further towards the resting phase. Heart and left ventricular weight increased with the progression of hypertension. The ratio of beta- to alpha-myosin heavy chain in the left ventricle was higher in 12- and 17-week-old SHRSP than in 10-week-old SHRSP. Brain weight was increased significantly in 17-week-old SHRSP compared with 10- and 12-week-old SHRSP. Increased urinary protein excretion and morphological changes in the glomerular basement membrane in the kidney were observed in 12- and 17-week-old SHRSP. CONCLUSIONS:These data suggest that SHRSP have an abnormal circadian blood pressure rhythm associated with hypertensive target-organ damage. This rat strain may therefore be a useful model in which to investigate the mechanisms responsible for the alteration in the circadian blood pressure rhythm, and to analyze the relationship between the abnormal circadian rhythm and target-organ damage.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Shimamura T,Nakajima M,Iwasaki T,Hayasaki Y,Yonetani Y,Iwaki K

doi

10.1097/00004872-199917020-00005

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

211-20

issue

2

eissn

0263-6352

issn

1473-5598

journal_volume

17

pub_type

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