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  • Stroke-prone spontaneously hypertensive rats  (1)
  • Tissue degeneration  (1)
  • 1
    ISSN: 1432-2307
    Keywords: Stroke-prone spontaneously hypertensive rats ; Arteriolar fibrinoid necrosis ; Smooth muscle cell proliferation ; Malignant hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A light-microscopic study of various organs of stroke-prone spontaneously hypertensive (SHRSP) rats was performed. The rats characteristically developed fibrinoid necrosis of the wall and marked cellular thickening of the intima and media of the arterioles and small arteries of the kidney, testicle, mesentery, adrenal gland, brain, etc. Parenchymal damage of the organs, secondary to the vascular alterations took place. There were no accumulations of lipids in the vascular lesions. Though stroke has been stressed as a characteristic clinical feature of the SHRSP rats, the cerebral lesions are different from those seen in ordinary cerebrovascular disease. Furthermore, many organs are involved. The overall vascular changes in the brain and other organs are consistent with those seen in malignant hypertension; the SHRSP rat is an excellent model of this disease.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0533
    Keywords: Fibrinoid arteriolar necrosis ; Microinfarct ; Edema ; Tissue degeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The relationship of the vascular changes to the cerebral lesions has been studied using serial sections of the brains from five cases of the strokeprone spontaneously hypertensive rats. Infraction was observed in a form of microinfarct related to single or plural occluded arterioles in the brain and subarachnoid space. Though most arterioles with fibrinoid necrosis of the wall were occluded with thrombus, infarct, which was obviously related to the occluded arterioles, was verified only in a few occasions. It was proved that infarction did not develop in all the areas irrigated by the occluded arterioles, and the regional circulation was assumed to have been maintained by the collateral circulation. There was rarefaction of the neuropil with preservation of the neurons in the cortex around the vascular changes, such as fibrinoid necrosis of the wall. Widespread rarefaction and cyst formation were observed in the subjacent white matter, which were more marked in the vicinity of the vascular changes in the cortex. These histological changes were interpreted to be the tissue degeneration secondary to edema.
    Type of Medium: Electronic Resource
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