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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 62 (1984), S. 1097-1101 
    ISSN: 1432-1440
    Keywords: Essential hypertension ; Angiotensin II ; Aldosterone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Regulation of aldosterone secretion by sodium chloride is impaired in a group of essential hypertensives: high-salt diet fails to suppress aldosterone in these patients despite low renin values. The mechanism of this impaired regulation of aldosterone has not been clarified so far. We tested the sensitivity of aldosterone secretion and blood pressure to A II in 20 normotensive controls (aged 20–60, MAP 92±3 mm Hg), in ten normotensives with one or two parents with hypertension, and in 21 patients with essential hypertension (aged 17–65, MAP 119±4 mm Hg). After a period of 6 days on high-salt intake (300–320 mEq Na+/day), A II (0.1, 0.5, 1.0 and 2.0 ng/kg/min) was infused, each concentration for 30 min. According to aldosterone excretion during sodium loading, patients were divided into group A with complete suppression (n=12, aldosterone excretion 3.6±0.4 µg/day) and in group B with insufficient suppression (n=9, aldosterone excretion 15.5±2.3 µg/day). Despite similarly low plasma renins, rise of serum aldosterone levels during A II infusion was significantly higher in group B patients than in group A patients and normotensive controls. Rise in mean arterial blood pressure, however, brought about by graded A II infusion was similar in both groups of hypertensives and in normotensive controls. The results demonstrate an increased adrenal sensitivity to A II in a subgroup of essential hypertensives only. A similar adrenal hypersensitivity to A II found by others in patients with hyperaldosteronism due to adrenal hyperplasia supports the hypothesis that the same mechanism underlies both disorders.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Renovascular hypertension ; Saralasin-infusion-Test ; Renal venous renin-determination ; 131J-Hippuric-acid-clearance-Test ; Renovaskuläre Hypertonie ; Saralasin-Infusions-Test ; Nierenvenenrenin ; 131Jod-Hippuran-Clearance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei Patienten mit einseitiger Nierenerkrankung und Hypertonie, vorwiegend einseitigen renovaskulären Erkrankungen, wurden der Nierenvenenreninquotient, die seitendifferente131Jod-Hippuran-Clearance und der Saralasin-Test untersucht und in ihrer Aussagefähigkeit verglichen: Dabei zeigte sich bei allen Patienten eine statistisch signifikante Zunahme des Nierenvenenreninquotienten mit zunehmendem Seitenunterschied des mittels131Jod-Hippuran-Clearance gemessenen renalen Plasmastroms. Der Nierenvenenreninquotient ist also nicht nur Ausdruck einer seitenunterschiedlichen Reninsekretion, sondern auch modifiziert durch die seitenunterschiedliche Durchblutung. Auch bei Angiotensin-unabhängigen Hypertonien bei einseitiger Nierenerkrankung ergaben sich bei starker Durchblutungsdifferenz beider Nieren Nierenvenenreninquotienten bis 2,0, ohne daß diese auf Hochdruckwirksamkeit hinwiesen. Bei geringerer Durchblutungsdifferenz beider Nieren zeigten dagegen schon niedrigere Nierenvenenreninquotienten eine einseitige Reninsekretion mit Hochdruckwirkung an. Nierenvenenreninquotienten im Grenzbereich zwischen 1,5 und 2,5 sollten deshalb nur unter gleichzeitiger Berücksichtigung der seitenunterschiedlichen Nierendurchblutung interpretiert werden. Patienten, bei denen auch unter Berücksichtigung der seitendifferenten Nierendurchblutung im Vergleich zur Angiotensin-unabhängigen Hypertonikergruppe erhöhte Nierenvenenreninquotienten gemessen wurden, zeigten im Saralasin-Infusions-Test ohne Ausnahme einen signifikanten Blutdruckabfall.
    Notes: Summary In patients with unilateral vascular kidney disease and hypertension, ratio of renal-vein-renin was compared with131I-Hippuric-acid clearance and change in blood pressure during Saralasininfusion. The ratio of renal-vein-renin was positively correlated with the ratio in renal plasma flow between the kidneys in all patients studied. The ratio of renins therefore is a result of two factors: The difference in renin secretion and the difference in blood flow in the two kidneys. In patients with angiotensin independent hypertension renin-ratios up to 2.0 were found without relevance to elevated blood pressure. When the difference in renal blood flow between both kidneys was small, even a slight difference in renal vein renin indicated hypertension related to increased renin secretion. Renin-ratios in the critical range between 1.5 and 2.5 should only be interpreted in respect to a similar ratio in renal blood flow.
    Type of Medium: Electronic Resource
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