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  • 1
    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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  • 2
    ISSN: 1432-1459
    Keywords: Malignant hypertension ; CSF lactate ; CSF protein ; Intracranial pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 21 Patienten mit maligner Hypertonie, 19 mit benigner Hypertonie und 21 mit normalem Blutdruck wurden in Blut und Liquor die Lactat- und Pyruvatkonzentrationen sowie die Säure-Basen-Parameter gemessen. Die Werte für das Lactat bzw. für das Lactat-Pyruvat-Verhältnis im Liquor waren bei Patienten mit maligner Hypertonie signifikant höher (1,90±0,10 mM/1, 19,2±1,0) als bei den Patienten mit benigner Hypertonie (1,50±0,05 mM/1, 15,7±0,7) bzw. bei normotensiven Individuen (1,44±0,04 mM/1, 15,7±0,4). Es bestand eine lineare Korrelation zwischen den Lactatwerten und dem Druck im Liquor (r=0,565, P〈0,01), wobei dies außerdem korrelierte mit einem mittleren arteriellen Blutdruck von mehr als 150 mm Hg (r=0,553, P〈0,01). Diese Zunahme in den Säuremetaboliten im Liquor weist darauf hin, daß der Hirnstoffwechsel bei maligner Hypertonie in eine anaerobe Phase tritt, wahrscheinlich wegen des erhöhten intrakraniellen Druckes. Es wird auch die Möglichkeit einer erhöhten cerebralen Gefäßdurchlässigkeit als mitbeteiligter Mechanismus erwogen.
    Notes: Summary Lactate and pyruvate concentrations and acid-base parameters in cerebrospinal fluid (CSF) and arterial blood were measured in 21 patients with malignant hypertension (MHT), 19 with benign hypertension (BHT) and 21 normotensive subjects (NT). Average values for CSF lactate and lactate/pyruvate (L/P) ratio were significantly higher in MHT (1.90±10mM/1, 19.2±1.0) than in either BHT (1.50±0.05 mM/1, 15.7±0.7) or NT (1.44±0.04 mM/1, 15.7±0.4). There was a linear correlation between CSF lactate and CSF pressure (r=0.565, P〈0.01), and the latter was also related to mean arterial pressure exceeding 150 mm Hg (r=0.553, P〈0.01). Such increases in the acid metabolites in CSF indicate that brain metabolism becomes anaerobic in MHT, probably due to increased intracranial prssure. Increased cerebrovascular permeability is also discussed as participating in causal mechanisms.
    Type of Medium: Electronic Resource
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