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  • Captopril  (5)
  • Cortisol  (5)
  • Springer  (10)
  • Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research
  • American Heart Association (AHA)
  • International Union of Crystallography (IUC)
  • 2010-2014
  • 1985-1989  (2)
  • 1980-1984  (3)
  • 1975-1979  (4)
  • 1970-1974  (1)
  • 1935-1939
  • 1915-1919
  • 1880-1889
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Publisher
  • Springer  (10)
  • Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research
  • American Heart Association (AHA)
  • International Union of Crystallography (IUC)
Years
  • 2010-2014
  • 1985-1989  (2)
  • 1980-1984  (3)
  • 1975-1979  (4)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 64 (1986), S. 327-332 
    ISSN: 1432-1440
    Keywords: Severe hypertension ; Minoxidil ; Captopril
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The antihypertensive efficacy of minoxidil and captopril was compared in 23 males with essential or renal parenchymatous hypertension refractory to conventional antihypertensive drug therapy. Following a pretreatment period the patients were randomly assigned to receive either minoxidil, 2.5 mg twice daily (n=12), or captopril, 25 mg twice daily (n=11). In patients with diastolic blood pressure 〉95 mmHg, doses of minoxidil and captopril were increased in 2-week intervals. Patients who maintained diastolic pressure 〉95 mmHg and/or those with intolerable side effects were switched over to the alternative substance. After a mean observation period of 12 weeks a significant decrease in systolic and diastolic blood pressure was observed (179/114 vs 148/92 mmHg in the minoxidil group; 176/111 vs 158/97 mmHg in the captopril group). The primary response rate was 75% in patients treated with minoxidil and 55% in those with captopril (not significant). After the change to the alternative substance two of the four non-responders on captopril and one of the two non-responders on minoxidil became responders. Side effects occurred significantly more often during minoxidil than captopril (p〈0.05). The high efficacy of minoxidil and captopril in the treatment of severe hypertension refractory to conventional drugs was confirmed. Minoxidil lowered blood pressure slightly more than captopril, but it had a higher incidence of side effects than captopril.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 62 (1984), S. 855-858 
    ISSN: 1432-1440
    Keywords: Cushing's syndrome ; Pathogenesis of hypertension ; Renin angiotensin system ; Captopril
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To analyse the role of the renin angiotensin system in the pathogenesis of hypertension in Cushing's syndrome ten patients with hypercorticism (five with pituitary hypothalamic dysfunction, three with adrenal adenomas and two with adrenal carcinomas) received a single oral dose of 25 mg captopril. Mean arterial pressure was then determined at short intervals over periods of up to 240 min. Plasma renin activity (PRA) was measured immediately before the administration of captopril. Eleven patients with severe essential hypertension, who showed a comparable distribution of basal PRA values, served as a control. Patients with elevated basal PRA values (〉3 ng/ml·3 h) showed, both in the subgroup of cases with essential hypertension and in that with Cushing's syndrome, a statistically significant fall (P〈0.05−P〈0.001) in mean arterial pressure, the decrease being slightly more pronounced in essential hypertensives. On the other hand patients with normal PRA values (≦3 ng/ml·3 h) exhibited only a minor fall in mean arterial pressure reaching statistical significance (P〈0.05) only after 60 min (essential hypertension) and 180 min (Cushing's syndrome), respectively. Our results document that in patients with Cushing's syndrome the effect of captopril seems to be determined by the activity of the renin angiotensin system. Thus, in a substantial number of patients with hypercorticism, the renin angiotensin system may be an important factor in the pathogenesis of hypertension, whereas in patients with low PRA values other factors like oversecretion of mineralocorticoids may be responsible for the observed blood pressure increases.
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  • 3
    ISSN: 1432-1440
    Keywords: Captopril ; Kidney function ; Essential hypertension ; Renovascular hypertension ; Renal parenchymatous hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To study long-term effects of captopril on renal function in patients with various forms of severe hypertension, serum creatinine values were monitored in 76 patients under captopril therapy over a period of up to 3 years. Three different groups were formed: (1) patients with essential hypertension (n=37); (2) patients with renovascular hypertension (n=20); (3) patients with renal parenchymatous hypertension (n=19). In each of the three groups reduction in blood pressure was accompanied by increases in serum creatinine. However, both changes were more pronounced in patients with renovascular hypertension. In this group only the rise in creatinine was statistically significant and showed a slight progression with duration of captopril treatment. Group specific analysis revealed that the increase was smaller in patients with unilateral (n=16) renovascular disease than in those with bilateral (n=4) involvement, but in the former it was still significantly higher than in patients with essential or renal parenchymatous hypertension. Separation of patients according to the underlying disease of renovascular hypertension showed that renal function deteriorated less in patients with arteriosclerotic origin (n=10) than in those with fibromuscular dysplasia (n=8). Statistical evaluation of subjects with renovascular and essential hypertension still revealed significant differences in creatinine when the patients with initial plasma renin activity (PRA) below and above 6 ng/ml·3 h were compared separately. A significant correlation (r=0.73;P〈0.05) between blood pressure reduction and creatinine changes was obtained only for patients with renovascular hypertension. Finally, in all three groups of patients creatinine changes were statistically independent from daily dosages of captopril. From these data we conclude that sustained impairment of kidney function by captopril is mainly restricted to patients with renovascular hypertension and possibly results from the combined effects of low renal perfusion pressure and interference with intrarenal regulation of glomerular filtration rate by a postulated angiotensin-II-mediated mechanism.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 63 (1985), S. 361-363 
    ISSN: 1432-1440
    Keywords: Primary aldosteronism ; Captopril ; Spironolactone ; Renin-angiotensin ; Converting-enzyme ; Secondary hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In three patients with primary aldosteronism, the acute effect of a single dose of captopril on the elevated mean arterial blood pressure (MAP) was studied before and after 4 weeks of treatment with spironolactone. Before spironolactone therapy, captopril did not cause any drop in MAP. Four weeks later, after an oral daily dose of 400 mg spironolactone, MAP was still elevated in all three patients, though electrolyte abnormalities were fully corrected. Since plasma renin activity (PRA) was increased to values above the normal range, the acute effect of captopril on MAP was tested again. A single dose of 25 mg captopril then caused a fall in MAP to normal. These data reveal the conversion from a renin-independent to a renindependent kind of hypertension after spironolactone therapy in three patients with primary aldosteronism syndrome. This might be of pathogenetic and therapeutic interest.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 59 (1981), S. 59-67 
    ISSN: 1432-1440
    Keywords: Captopril-treatment resistant hypertension ; Essential hypertension ; Renalparenchymatous hypertension ; Renovascular hypertension ; Captopril ; therapieresistente Hypertonie ; Essentielle Hypertonie ; Renalparenchymatöse Hypertonie ; Renovaskuläre Hypertonie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der vorliegenden Studie wurden 51 Patienten mit schwerer, auf eine standardisierte Dreiertherapie resistente Hypertonie (20 mit essentieller, 15 mit renovaskulärer und 16 mit renalparenchymatöser Hypertonie) mit dem oralen Converting enzyme Inhibitor Captopril behandelt. Die mittlere Behandlungszeit betrug 8,6 Monate für Patienten mit essentieller, 8,9 Monate für solche mit renovaskulärer und 9,9 Monate für Fälle mit renalparenchymatöser Hypertonie. In allen 3 Patientengruppen konnte ein ausgeprägter und anhaltender Blutdruckabfall beobachtet werden. Allerdings war sowohl der absolute Blutdruckabfall als auch die individuelle Blutdruckantwort bei Patienten mit renovaskulärer Hypertonie ausgeprägter als bei solchen mit essentieller und renalparenchymatöser Hypertonie. Diese Ergebnisse weisen damit auf einen stärkeren antihypertensiven Effekt von Captopril bei Patienten mit renovaskulärer Hypertonie hin. Unsere Resultate zeigen weiter, daß eine Monotherapie mit Captopril eher die Ausnahme als die Regel war. So benötigten über 90% der Patienten zusätzliche Gabe eines Diuretikums und ein weiterer Anteil der Patienten darüberhinaus die Gabe eines Betablockers (50% der Patienten mit essentieller, 38% der Fälle mit renalparenchymatöser und 26% der Patienten mit renovaskulärer Hypertonie). Die Plasma-Renin-Aktivität stieg unter Captoprilbehandlung erwartungsgemäß an, während die Plasma-Aldosteron-Konzentration und die Converting enzyme Aktivität abfielen. In 17,6% (n=9) der 51 Patienten konnten Nebenwirkungen (Exanthem, Pruritus, supraventrikuläre Extrasystolen, Tachykardie, Wasser- und Flüssigkeitsretention, Raynaud-Phänomen, unvollständiger und vollständiger Geschmacksverlust und Leukopenie) beobachtet werden. Unsere Ergebnisse zeigen, daß Captopril bei schwerer therapieresistenter Hypertonie ein potentes Antihypertensivum ist. Dabei war bei unseren Patienten eine Monotherapie mit Captopril eher die Ausnahme als die Regel. So benötigten die meisten Patienten zusätzlich ein Diuretikum und/oder einen Betablocker. Allerdings erfordern die Nebenwirkungen des Medikaments eine engmaschige und genaue Überwachung aller Patienten.
    Notes: Summary In this study 51 patients with severe hypertension (20 essential, 15 renovascular and 16 renalparenchymatous) resistant to a standardized triple therapy were treated with the oral converting enzyme inhibitor captopril. Mean treatment period was 8.6 in essential, 8.9 in renovascular and 9.9 months in renalparenchymatous hypertension. In each of the 3 groups a marked and sustained blood pressure reduction was observed promptly after introducing captopril. However, absolute fall in mean blood pressure as well as individual blood pressure response were more pronounced in renovascular than in essential and in renalparenchymatous hypertension demonstrating a higher blood pressure lowering activity of the converting enzyme inhibitor in the former. In addition, our results document that monotherapy with captopril was rather the exception than the rule. More than 90% of all patients required at least the addition of a diuretic and even a substantial percentage of patients needed as a third drug a betablocker (50% in essential, 38% in renalparenchymatous and 26% in renovascular hypertension). As expected renin activity increased under captopril whereas plasma aldosterone and converting enzyme activity decreased. Side-effects (skin rash, pruritus, supraventricular extrasystoles, tachycardia, water and fluid retention, Raynaud-phenomenon, incomplete and complete taste loss and leucopenia) occurred in 17.6% (n=9) of the 51 patients. Our results show that captopril is a potent blood pressure lowering agent in severe and therapy resistant hypertension. The vast majority of patients, however, required concomitant therapy with a diuretic and/or a betablocker. Finally, the frequency of drug induced side-effects necessitates a close and careful monitoring of all patients.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 51 (1973), S. 1025-1026 
    ISSN: 1432-1440
    Keywords: Cushing's syndrome ; hydrocortison ; circadian rhythm ; Cushing-Syndrom ; Cortisol ; Tagesrhythmus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Wiederholte ambulante Plasmacortisolbestimmungen bei einer Patientin mit deutlichen klinischen Zeichen des Hyperkortizismus ergaben mit 16–24 µg/100 ml normale Werte. Erst ein unter standardisierten Bedingungen erstelltes Plasmacortisol-Tagesprofil erbrachte den eindeutigen Nachweis der Hypercortisolämie. Im Vergleich zu gesunden Normalpersonen liegen die Plasmacortisolspiegel der Cushing-Patientin auf einer höheren Ebene. Die physiologischen Phasen ruhender Cortisolsekretion in den Abend- und Nachtstunden fehlen. Wie bei Gesunden können wir bei diesem Fall von Hypercortic ismus, beruhend auf bilateraler Nebennierenrinden-Hyperplasie, große Schwankungen des Plasmacortisolspiegels beobachten. Der Wert wiederholter Plasmacortisolbestimmungen in der Abklärung des Cushing-Syndroms wird diskutiert.
    Notes: Summary In a patient with typical features of Cushing's disease, repeated ambulant determinations of plasma cortisol showed normal values with 16 to 24 µg/100 ml. The entire analysis of the circadian variations of plasma cortisol under standardized conditions led to the diagnosis of hypercorticism. Compared with 2 healthy subjects the patient's curve is set at a higher level. Physiological, quiet periods of cortisol secretion in late day-time do not occur. In accord to the normal, we find great variations of plasma cortisol in this case of Cushing's syndrome due to bilateral adrenal hyperplasia. The diagnostic value of plasma cortisol determinations at short term intervals in differentiating the various forms of hypercorticism is discussed.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 53 (1975), S. 955-959 
    ISSN: 1432-1440
    Keywords: Renin ; Aldosteron ; Cortisol ; Kalium ; Orthostase ; Renin ; aldosterone ; cortisol ; potassium ; orthostasis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Plasma aldosterone, plasma renin activity (PRA), plasma cortisol as parameter of ACTH activity and the serum concentrations of sodium and potassium were determined at short time intervals in 10 healthy students after an overnight bedrest and during three hours of ambulation. While PRA rose significantly within 15 minutes of orthostasis in all students, plasma aldosterone showed a similar rapid increase in some of the subjects only. These persons demonstrated also a simultaneous increase of serum potassium or of plasma cortisol. Plasma aldosterone rose not before 30 to 60 minutes after change to the upright position in subjects who showed neigher plasma cortisol nor serum potassium increases. It is concluded that the immediate rise of plasma aldosterone during orthostasis seems to depend on a stimulation by ACTH of by potassium. The main stimulus of plasma aldosterone during orthostasis appears to be the renin angiotensin system. If the aldosterone response to posture is mediated only through this system a delay of 30 to 60 minutes is observed.
    Notes: Zusammenfassung Plasma-Aldosteron, Plasma-Renin-Aktivität (PRA), Plasmacortisol (als Parameter der ACTH-Aktivität) und die Serumkonzentrationen von Natrium und Kalium wurden bei 10 gesunden Studenten nach Bettruhe und in kurzen Zeitabständen während drei Stunden nach dem Aufstehen gemessen. Während die PRA innerhalb von 15 min nach dem Aufstehen bei allen Studenten signifikant anstieg, wurde ein ähnlich schneller Anstieg des Plasmaaldosterons nur bei einigen der Probanden beobachtet. Nur bei diesen wurde ein gleichzeitiger Anstieg des Serumkaliums oder des Plasmacortisols beobachtet. Bei den Studenten, bei denen weder das Plasmacortisol noch das Serumkalium anstiegen, stieg das Plasmaaldosteron frühestens nach 30–60 min nach dem Aufstehen an. Aus den Ergebnissen wird geschlossen, daß der sofortige Anstieg des Plasmaaldosterons nach dem Aufstehen von einer Stimulation durch ACTH oder Kalium abzuhängen scheint. Der Hauptstimulus für das Aldosteron scheint während der Orthostase jedoch das Renin-Angiotensin-System zu sein. Wird Aldosteron nur über dieses System stimuliert, erfolgt der Aldosteronanstieg mit einer Verzögerung von 30–60 min.
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  • 8
    ISSN: 1432-1440
    Keywords: Altern ; Renin ; Aldosteron ; Cortisol ; Katecholamine ; Austauschbares Natrium ; Blutvolumen ; Aging ; Plasma renin ; Plasma aldosterone ; Plasma cortisol ; Urinary catecholamines ; Blood volume ; Exchangeable sodium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Interrelations between age and plasma renin, aldosterone and cortisol levels, urinary catecholamines, plasma and blood volumes, exchangeable body sodium and blood pressure were studied in 28 young (19 to 29 years), 16 middle-aged (32 to 58 years) and 15 elderly (60 to 74 years) healthy subjects. Supine and upright plasma renin and supine aldosterone levels decreased while urinary noradrenaline excretion rate increased progressively with aging (r≥0.34;p〈0.05), with significant differences in mean values between young and elderly subjects (p〈0.02). There was also an age-related decrease in upright plasma aldosterone concentration, although this was not statistically significant. Furthermore, mean plasma cortisol concentrations increased in response to upright posture in elderly (+50%;p〈0.02), but not in young (−10%) or middle-aged (−8%) subjects. Blood pressure correlated with age (r=0.35;p〈0.05) or noradrenaline excretion rate (r=0.34) in the entire study population and with blood volume in the elderly (r=0.68), but not in the young or middle-aged study groups. There were no significant age-related differences in the body sodium/volume state, basal plasma cortisol levels or urinary adrenaline excretion rate, and plasma renin or aldosterone levels did not correlate with these parameters or with blood pressure. It is concluded that the influence of age on plasma renin or aldosterone levels, plasma cortisol responsiveness to upright posture, and urinary noradrenaline excretion should be taken into consideration, whenever these factors have to be interpreted in patients with arterial hypertension or other clinical disorders. Furthermore, these data are consistent with the possibility that in normal man increases in supine blood pressure with aging may be related at least partly to concomitant changes in free peripheral noradrenaline.
    Notes: Zusammenfassung Untersuchungen bei 28 jungen (19–29 Jahre), 16 mittel-alten (32–58 Jahre) und 15 älteren (60–74 Jahre) Normalpersonen zeigten eine mit zunehmendem Alter progressive Abnahme der Plasmareninaktivität und -aldosteronkonzentration sowie eine Zunahme der Noradrenalinexkretionsrate. Mit Ausnahme der im Stehen gemessen Plasmaaldosteronspiegel waren die Korrelationen dieser Parameter mit dem Alter (r≥0,34;p〈0.05) sowie die Unterschiede der Mittelwerte zwischen jungen und älteren Personen (p〈0,02) signifikant. Die Plasmacortisolkonzentration blieb beim Aufstehen bei jungen und mittel-alten Personen im Mittel unverändert (−10 und −8%), stieg jedoch bei älteren Menschen um 50% an (p〈0,02). Der Blutdruck korrelierte (p〈0,05) bei Analyse der gesamten Studienpopulation mit dem Alter (r=0,35) und der Noradrenalinexkretionsrate (r=0,34), bei den älteren Personen fand sich auch eine signifikante Beziehung zum Blutvolumen (r=0,68). Austauschbares Körpernatrium, Plasma- und Blutvolumina und Adrenalinexkretionsrate zeigten keine signifikanten altersbezogenen Variationen. Plasmarenin- und -aldosteronspiegel korrelierten weder mit diesen letzteren Parametern noch mit dem Blutdruck. Es wird gefolgert, daß der Einfluß des Alters auf Plasmarenin- und -aldosteronwerte, das freie periphere Noradrenalin und die Stimulierbarkeit von Plasmacortisol durch Orthostase in Betracht gezogen werden sollte, wenn immer diese Faktoren bei Patienten mit arterieller Hypertonie oder anderen klinischen Störungen interpretiert werden müssen. Diese Resultate sind außerdem mit der Möglichkeit vereinbar, daß die altersbezogene Zunahme des Liegendblutdrucks beim normalen Menschen zumindest teilweise auf dem parallelen Anstieg des freien peripheren Noradrenalins beruhen könnte.
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  • 9
    ISSN: 1432-1440
    Keywords: Aldosterone ; cortisol ; sodium ; potassium ; hemodialysis ; Aldosteron ; Cortisol ; Natrium ; Kalium ; Hämodialyse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Plasmaaldosteron, Plasmacortisol und die Serumkonzentrationen von Kalium und Natrium wurden bei 5 nierenlosen Patienten vor und in kurzen Zeitabständen bis zu 180 min nach Beendigung der Hämodialyse gemessen. Unter Hämodialyse stieg das Plasmaaldosteron bei 4 der 5 Patienten an, während bei allen Patienten Cortisol, Kalium und Natrium abfielen. Nur bei einem Patienten ließ sich unter Hämodialyse ein Abfall des Aldosterons nachweisen. Nach Beendigung der Hämodialyse kam es über den untersuchten Zeitraum bei 3 der 5 Patienten zu cinem fast kontinuierlichen Abfall des Plasmaaldosterons, während die beiden anderen Patienten Sekretionsepisoden des Aldosterons mit spontanen Anstiegen und anschließendem Abfall der Hormonkonzentration zeigten. Bei allen Patienten stieg nach Hämodialyse das Serumkalium rasch wieder an, während nur geringgradige Veränderungen des Serumnatriums nachweisbar waren. Plasmacortisol zeigte während der Beobachtungsperiode typische tageszeitliche Schwankungen. Wir nehmen an, daß ein noch unbekannter Faktor für den Anstieg des Plasmaaldosterons unter Hämodialyse verantwortlich ist. Einiges spricht dafür, daß über den nach Hämodialyse beobachteten Zeitraum die intracelluläre Kaliumkonzentration und nicht das Serumkalium die Aldosteronsekretion beeinflußt. Dies würde den bei 3 der 5 Patienten scheinbar paradoxen Abfall des Aldosterons bei steigendem Serumkalium erklären.
    Notes: Summary Plasma aldosterone, plasma cortisol and the serum concentrations of sodium and potassium were determined in 5 anephric patients before and at short time intervals up to 180 minutes after hemodialysis. Plasma aldosterone increased in 4 of 5 patients during hemodialysis while in all patients plasma cortisol, sodium and potassium decreased. Only one patient showed a fall in aldosterone during hemodialysis. After hemodialysis plasma aldosterone gradually decreased over a period of 3 hours in 3 of 5 patients, whereas the remaining two patients showed typical secretory episodes of aldosterone. In each patient serum potassium rapidly increased while serum sodium showed only minor variations. Plasma cortisol followed the normal circadian rhythm. We suggest that a still unknown factor had caused the observed increases in plasma aldosterone during hemodialysis. There are reasons to believe that over the period observed after hemodialysis the intracellular potassium concentration and not serum potassium levels has influenced adrenal aldosterone release. This would explain the paradoxical decrease in plasma aldosterone in 3 of the 5 patients while serum potassium increased.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 56 (1978), S. 229-234 
    ISSN: 1432-1440
    Keywords: Aldosteron ; Renin ; Cortisol ; Diabetes mellitus ; Hypoaldosteronismus ; Hyperkaliämie ; Aldosterone ; Renin ; Cortisol ; Diabetes ; Hypoaldosteronism ; Hyperkalemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In three patients with diabetes and hyporeninemic hypoaldosteronism changes in renin activity, plasma aldosterone and cortisol were examined under various conditions: orthostasis and intravenous furosemide, infusion of synthetic β1–24 ACTH on two consecutive days and diurnal variations in basal hormone fluctuations. Each patient showed unmeasurably low renin activity unresponsive to orthostasis and intravenous furosemide while plasma aldosterone was below normal range. Under ACTH-infusion only marked increases in aldosterone were observed in one patient whereas cortisol responded normally in all diabetics tested. Analysis of diurnal night day fluctuations (20.00–8.00) in plasma aldosterone and cortisol revealed a close and statistically significant relationship between both hormones in each of the three patients (p〈0.05–〈0.001). Variations in plasma aldosterone thus were mediated through changes in endogenous pituitary ACTH. Compared with normal controls however, diurnal aldosterone curves were set at a lower level. Our results demonstrate that a reduced sensitivity of the adrenal gland to ACTH is not responsible for the observed subnormal plasma aldosterone levels in these patients. Therefore, the lack of circulating angiotensin II seems to be the causative reason of hypoaldosteronism. The exact mechanism of undetectable renin activity in these patients remains unknown.
    Notes: Zusammenfassung Bei drei Patienten mit Diabetes mellitus und hyporeninämischem Hypoaldosteronismus wurden Veränderungen der Plasmareninaktivität, des Plasmaaldosteron- und Plasmacortisolspiegels unter folgenden Bedingungen geprüft: Orthostase und intravenöse Furosemidapplikation, Infusion von synthetischem β1–24 ACTH an zwei aufeinanderfolgenden Tagen, Tag-Nacht-Rhythmus der basalen Hormonplasmaspiegel. Alle Patienten zeigten eine nicht meßbare und durch Orthostase und Furosemid nicht stimulierbare Reninaktivität. Gleichzeitig wurden subnormale Aldosteronplasmakonzentrationen gemessen. Unter ACTH-Infusion zeigte nur ein Patient einen deutlichen Anstieg des Plasmaaldosterons, während das Plasmacortisol in allen drei Fällen normal stimulierbar war. Die statistische Analyse der Tag-Nacht-Schwankungen von Plasmaaldosteron und Plasmacortisol zeigte in jedem der Fälle eine enge und statistisch signifikante Beziehung zwischen beiden Hormonen (p〈0,05–〈0,001). Es ist somit anzunehmen, daß Schwankungen des Plasmaaldosterons durch Veränderungen der hypophysären ACTH-Ausschüttung verursacht wurden. Jedoch war im Vergleich zu Normalpersonen die Rhythmik des basalen Plasmaaldosterons auf einem tieferen Niveau eingestellt. Unsere Ergebnisse lassen den Schluß zu, daß bei diesen Patienten nicht eine verminderte Sensitivität der Nebennierenrinde auf ACTH für die beobachteten subnormalen Aldosteronspiegel verantwortlich ist. Ursache für den Hypoaldosteronismus scheint somit der Mangel an zirkulierendem Angiotensin II zu sein. Der genaue Mechanismus der nicht meßbaren Reninaktivität bei diesem Patienten bleibt unbekannt.
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