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  • 1
    ISSN: 1432-1440
    Keywords: Plasma-Renin-Aktivität ; Propranolol ; Prindolol ; Plasma renin activity ; propranolol ; prindolol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary To investigate the effect of propranolol and prindolol on renin secretion plasma renin activity (PRA) was determined overnight at short-time intervals in 10 sodium-restricted normal supine subjects. 4 of them were on a 4-days medication with propranolol, 3 were treated with prindolol and 3 were used as control group. In normal controls renin was secreted episodically and showed characteristic night-day variations. Both in propranolol and in prindolol-treated subjects secretory episodes in renin secretion either did not occur or were less frequent than in normal controls. With one exception night-day variations in renin secretion were not observed. Mean PRA values were significantly lower than in the control group (p〈0.001). Our results show that both propranolol and prindolol lower PRA and eliminate or reduce the frequency of secretory episodes. It is concluded that the sympathetic nervous system plays an important role in regulating night-day variations and short-time fluctuations of renin secretion in normal supine man.
    Notes: Zusammenfassung Um den Effekt von Propranolol und Prindolol auf die Reninsekretion zu untersuchen, wurde unter natriumarmer Ernährung bei 10 liegenden Normalpersonen in kurzen Zeitabständen über Nacht die Plasma-Renin-Aktivität (PRA) bestimmt. 4 Personen standen unter einer 4tägigen Behandlung mit Propranolol, 3 wurden über denselben Zeitraum mit Prindolol behandelt und 3 Personen dienten als Kontrollgruppe. Bei Normalpersonen zeigte Renin sowohl eine episodische Sekretion als auch einen typischen Nacht-Tag-Rhythmus. Unter Propranolol und Prindolol wurden Sekretionsepisoden des Renins entweder nicht beobachtet oder traten seltener auf. Eine Nacht-TagSchwankung der Reninsekretion war mit einer Ausnahme nicht zu beobachten. Unter beiden Betablockern war die mittlere PRA signifikant niedriger als bei Kontrollpersonen (p〈0.001). Unsere Ergebnisse zeigen, daß Propranolol und Prindolol die Renin-Aktivität senken und entweder die episodische Reninsekretion aufheben oder zu einer Frequenzabnahme der Sekretionsepisoden führen. Unsere Resultate erlauben die Schlußfolgerung, daß das sympathische Nervensystem eine bedeutende Rolle in der Steuerung der Nacht-Tag-Rhythmik und in der Regulation der Kurz-ZeitSchwankungen der Reninsekretion spielt.
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  • 2
    ISSN: 1432-1440
    Keywords: Cushing-Syndrom ; Hypertonie ; Renin-Aktivität ; Aldosteronismus ; Cushing's syndrome ; Hypertension ; Renin activity ; Aldosteronism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary To investigate the role of the renin angiotensin system in the pathogenesis of hypertension in Cushing's syndrome two patients with hypercorticism were infused with 20 mg saralasin (1-sar-8-alaangiotensin II) over a period of 30 minutes under constant blood pressure control. In addition, one patient with primary aldosteronism, an established form of mineralocorticoid hypertension, served as control. Neither in the two patients with Cushing's syndrome nor in the patient with primary aldosteronism could a blood pressure lowering effect of saralasin be observed. In the two patients with hypercorticism both renin activity and plasma aldosterone increased during saralasin infusion. The patient with primary aldosteronism only showed a weak increase in plasma aldosterone concentration. These results seem to exclude an important role of the renin angiotensin system in the pathogenesis of hypertension in Cushing's syndrome. The unresponsiveness of elevated blood pressure to saralasin in the two patients with hypercorticism and in the patient with primary aldosteronism indirectly supports the assumption that in patients with Cushing's syndrome increased mineralocorticoid activity may be the main factor in the pathogenesis of hypertension.
    Notes: Zusammenfassung Um die Bedeutung des Renin-Angiotensin Systems in der Pathogenese der Hypertonie bei Cushing-Syndrom zu untersuchen, wurden bei 2 Patienten mit Hyperkortizismus 20 mg Saralasin (1-Sar-8-Ala-Angiotensin II) über einen Zeitraum von 30 min unter ständiger Blutdruckkontrolle infundiert. Zusätzlich diente ein Patient mit primärem Aldosteronismus, einer etablierten Form von Mineralokortikoidhochdruck, als Kontrolle. Weder bei den 2 Patienten mit Cushing-Syndrom noch bei dem Patienten mit primärem Aldosteronismus ließ sich ein blutdrucksenkender Effekt des Saralasins nachweisen. Die beiden Patienten mit Hyperkortizismus zeigten unter Saralasin sowohl einen Anstieg der Renin-Aktivität als auch des Plasmaaldosterons. Bei dem Patienten mit primärem Aldosteronismus ließ sich nur ein geringgradiger Anstieg der Plasmaaldosteronkonzentration nachweisen. Diese Ergebnisse sprechen gegen eine wichtige Rolle des Renin-Angiotensin Systems in der Pathogenese der Hypertonie bei Cushing-Syndrom. Die Unbeeinflußbarkeit des Hochdrucks durch Saralasin bei den beiden Patienten mit Hyperkortizismus und dem Patienten mit primärem Aldosteronismus stützen indirekt die Annahme, daß bei Patienten mit Cushing-Syndrom eine erhöhte Mineralokortikoidaktivität der Hauptfaktor in der Pathogenese der Hypertonie ist.
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  • 3
    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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  • 4
    ISSN: 1432-1440
    Keywords: Renal artery aneurysm ; Renal cyst ; Hydronephrosis ; Coarctation of the aorta ; Radiation nephritis ; Hypertension ; Renin angiotensin system ; Nierenarterienaneurysma ; Nierencyste ; Hydronephrose ; Coarctatio aortae ; Strahlennephritis ; Hypertonie ; Renin-Angiotensin-System
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der vorliegenden Studie wurden 19 Patienten mit seltenen Formen renaler Hypertonie untersucht: 6 Patienten mit Nierenarterienaneurysma, 6 Fälle mit unilateraler Hydronephrose, 4 Patienten mit unilateraler Nierencyste, 2 Fälle mit Coarctatio aortae und assozierter Nierenarterienstenose und ein Patient mit Strahlennephritis. Die Plasma-Renin-Aktivität (PRA) im Nierenvenenblut wurde bei 17 der 19 Fälle bestimmt. 7 dieser 17 (41%) Patienten zeigten einen signifikanten Seitenunterschied (PRA betroffene/PRA nicht betroffene Seite) ≧1,5. Der Prozentsatz positiver Tests war in verschiedenen Kollektiven vergleichbar hoch. Nur Patienten mit unilateraler Nierencyste zeigten in keinem Fall einen signifikanten PRA-Quotienten. Eine superselektive Nierenvenenrenin-Bestimmung bei 2 Patienten mit Nierenarterienaneurysma der oberen Segmentarterie zeigte in beiden Fällen eine erhöhte Plasma-Renin-Aktivität im Bereiche des Oberpols. 15 der 19 Patienten (79%) wurden operiert. Dabei kamen entweder plastisch rekonstruktive Verfahren oder eine Nephrektomie zur Anwendung. 4 Fälle mit Nierenarterienaneurysma wurden antihypertensiv behandelt. Patienten mit unilateraler Hydronephrose zeigten postoperativ die besten Ergebnisse (3 geheilt, 3 gebessert), während bei keinem der 4 Patienten mit unilateraler Nierencyste die Blutdruckwerte durch den operativen Eingriff normalisiert werden konnten (3 gebessert, 1 nicht gebessert). Die Patienten mit Coarctatio aortae und assozierter Nierenarterienstenose sowie die 2 operierten Fälle mit Nierenarterienaneurysma zeigten alle ein gutes Ansprechen auf den gefäßrekonstruktiven Eingriff (2 geheilt, 2 gebessert). Der Patient mit Strahlennephritis schließlich war 2 Jahre nach Nephrektomie gebessert. Im Gesamtkollektiv unserer operierten Patienten war die prognostische Aussagekraft der Nierenvenenreninbestimmung beschränkt. Allerdings erwies sich die selektive Nierenvenenreninbestimmung bei Patienten mit einem Aneurysma einer Nierensegmentarterie als nützlich zur Entdeckung lokaler Reninüberproduktion.
    Notes: Summary In the present study 19 patients with rare forms of renal hypertension were investigated: 6 patients with renal artery aneurysm, 6 cases with unilateral hydronephrosis, 4 patients with unilateral simple renal cyst, 2 cases with coarctation of the abdominal aorta and associated renal artery stenosis and 1 patient with radiation nephritis. Renal venous renin activity (PRA) was determined in 17 of the 19 cases. Seven of these 17 (41%) patients showed significant PRA-ratios (PRA affected/PRA unaffected side ≧1.5). The percentage of positive tests was comparably high in the various subgroups except in patients with renal cyst, none of them showing lateralisation of renin secretion. Selective sampling in 2 patients with renal artery branch aneurysm revealed in both cases marked local renin oversecretion. Fifteen of the 19 patients (79%) were operated either by reconstruction surgery or nephrectomy. Four cases with a renal artery aneurysm were treated with antihypertensive drugs. Patients with unilateral hydronephrosis showed the best response to surgery in terms of cure rate (3 cured, 3 improved), whereas blood pressure normalisation could not be achieved in patients with simple renal cyst (2 improved, 1 unimproved). Patients with coarctation of the abdominal aorta and associated renal artery stenosis and the 2 operated cases with renal artery aneurysm showed a good effect of corrective surgery (2 cured, 2 improved). The patient with radiation nephritis finally was improved 2 years after nephrectomy. For the total group the prognostic validity of renal venous renin determination was limited. However, selective blood sampling from peripheral renal veins may be useful in cases with renal artery branch aneurysm to detect local oversecretion of renin.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 59 (1981), S. 27-34 
    ISSN: 1432-1440
    Keywords: Regulation of aldosterone ; Anephric patients ; ACTH ; Angiotensin II ; Hemodialysis ; Aldosteronregulation ; Nierenlose Patienten ; ACTH ; Angiotensin II ; Hämodialyse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 14 anephrischen Patienten wurde der Einfluß von ACTH, Angiotensin II, Orthostase und Hämodialyse auf die Plasmaaldosteronkonzentration untersucht. Gleichzeitg wurden Plasmareninaktivität (PRA), Plasmacortisol, Serumnatrium und Serumkalium bestimmt. Unter 4stündiger Infusion von synthetischem ACTH (2,5 µg/min Synachten) kam es zu einem signifikanten Anstieg des Plasmaaldosterons und des Plasmacortisols (p〈0,025 bzw. 〈0,005), während Serumnatrium und Serumkalium unverändert blieben. Eine einstündige Infusion einer suppressorischen Dosis von synthetischem Angiotensin II (1,0 ng/kg Körpergewicht/min Hypertensin) führte zu einem geringgradigen, jedoch nicht signifikanten Anstieg des Plasmaaldosterons und hatte keinen Einfluß auf Plasmacortisol und Serumelektrolyte. Eine nach 60 min zusätzlich durchgeführte ACTH-Infusion (2,5 µg/min Synacthen) bewirkte über einen Zeitraum von 4 h einen ähnlichen Plasmaaldosteronansteig wie die alleinige ACTH-Infusion. Durch Orthostase ließ sich ein signifikanter Anstieg des Plasmaaldosterons (p〈0,05) erzielen, während Plasmacortisol und Serumelektrolyte keine signifikanten Veränderungen zeigten. Sowohl normale als auch isonatriämische und isokaliämische Hämodialyse führten zu einem vergleichbaren Anstieg des Plasmaaldosterons. Das Plasmacortisol blieb bei der normalen Hämodialyse unverändert und fiel bei der isonatriämischen und isokaliämischen Hämodialyse ab. Die Plasmareninaktivität war unter den beschriebenen Versuchsbedingungen mit ganz wenigen Ausnahmen nicht meßbar (〈0,2 mg/ml·3 h). Vereinzelt tiefnormale PRA-Werte wurden weder durch Hämodialyse noch Orthostase beeinflußt. Unsere Ergebnisse zeigen bei nierenlosen Patienten eine Stimulation des Plasmaaldosterons durch synthetisches ACTH, ein geringgradiges Ansprechen auf suppressorisches Angiotensin II, eine fehlende Potenzierung der ACTH-Wirkung durch suppressorische Dosen von Angiotensin II und einen Aldosteronanstieg unter Orthostase. Ferner ließ sich unter Hämodialyse ein Anstieg des Plasmaaldosterons beobachten. Dieser Anstieg trat sowohl unter normaler als auch unter isokaliämischer und isonatriämischer Hämodialyse auf und konnte deshalb ebenso wie die durch Orthostase induzierte Veränderung der Hormonkonzentration keinem der bekannten aldosteronstimulierenden Faktoren zugeordnet werden. Eine mögliche Beteiligung anderer Faktoren an der Aldosteronregulation ist deshalb anzunehmen.
    Notes: Summary The influence of ACTH, angiotensin II, orthostasis and hemodialysis on plasma aldosterone concentration was investigated in 14 anephric patients. Furthermore, plasma renin activity (PRA), plasma cortisol, plasma sodium concentration and plasma potassium concentration were measured. After infusion of synthetic ACTH (2.5 εg/min Synacthen) for 4 h a significant rise of plasma aldosterone concentration and plasma cortisol concentration was observed (p〈0.025,p〈0.005, respectively), whereas serum sodium and serum potassium concentrations remained unchanged. A slight though not statistically significant rise of plasma aldosterone concentrations was observed after 1 h-infusion of synthetic angiotensin II (1.0 ng/kg/min Hypertensin) while plasma cortisol concentration and serum electrolytes showed only minor changes. Sixty min after starting the infusion with angiotensin II ACTH (2.5 µg/min Synacthen) was infused additionally over a period of 4 h. Under the latter conditions as with ACTH alone an increase of plasma aldosterone concentration was observed. Orthostasis caused a significant rise in plasma aldosterone (p〈0.05), whereas plasma cortisol and the serum electrolytes remained unchanged. Conventional as well as isonatriaemic and isokaliaemic hemodialysis let to a comparable increase of plasma aldosterone. Plasma cortisol was unchanged during conventional hemodialysis, and showed a decrease after isonatriaemic and isokaliaemic hemodialysis. With a few exceptions plasma renin activity (PRA) was undetectable low (〈0.2 ng/ml·3 h). In those instances where low normal PRA values were found, these values were not influenced by hemodialysis or orthostasis. Our results show that in anephric patients plasma aldosterone increased in response to synthetic ACTH, orthostasis and hemodialysis. After the infusion of angiotensin II only a slight, statistically not significant increase in plasma aldosterone concentration was observed. The simultaneous infusion of ACTH and angiotensin II let to a comparable increase in plasma aldosterone as ACTH alone. Furthermore, hemodialysis let to an increase of plasma aldosterone under conventional as well as under isokaliaemic and isonatriaemic conditions. These changes in hormone concentration as well as those induced by orthostasis could not be explained by one of the known aldosterone stimulating factors. Thus, our findings suggest that other factors may be involved in the regulation of plasma aldosterone in anephric man.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 61 (1983), S. 803-805 
    ISSN: 1432-1440
    Keywords: Obesity ; Hypertension ; Intracellular sodium ; Intracellular calcium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Intracellular activities of sodium and calcium were determined in red cells of patients with obesity. Compared to normal people mean intracellular sodium and calcium were higher in obese patients. However, increased intracellular sodium and calcium could only be observed in those patients with obesity suffering from hypertension or showing a familial disposition to hypertension. In contrast there was no difference in intracellular sodium and calcium between obese normotensives lacking a familial disposition to hypertension and normal people. Thus, our results suggest, that the observed variations in intracellular sodium and calcium in obesity are due to an enhanced blood pressure or a familial disposition to hypertension and not specific for obesity.
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  • 7
    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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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 65 (1987), S. 428-432 
    ISSN: 1432-1440
    Keywords: Rare cause of primary aldosteronism ; Hypokalemic hypertension ; Diagnostic procedure ; Treatment of malignant adrenal disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A 58-year-old white woman with hypertension and severe hypokalemia was found to have a carcinoma of the left adrenal gland. Plasma renin activity was constantly under the normal limit, while plasma aldosterone levels were pathologically elevated. Plasma cortisol (8:00 a.m.) and excretion rates of urinary free cortisol were within the normal range. After an adrenalectomy, relapsing excessive aldosterone secretion was successfully treated with opDDD (Lysodrene). Ten months after the diagnosis was established, the patient died from a bleeding liver metastasis.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 52 (1974), S. 719-721 
    ISSN: 1432-1440
    Keywords: Aldosterone ; renin ; pheochromocytoma ; Aldosteron ; Renin ; Phaechromocytom
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Sieben von 8 Patienten mit einem Phäochromocytom zeigten eine über die Norm erhöhte Plasma-Renin-Aktivität (〉3 ng/ml/3 h). Bei 4 der 7 Patienten mit Hyperreninismus konnte gleichzeitig auch ein abnorm hohes Plasma-Aldosteron nachgewiesen werden (〉120 pg/ml). Seitengetrennte Bestimmungen der Plasma-Renin-Aktivität im Nierenvenenblut zweier Patienten zeigten, daß als Ursachen des Hyperreninismus sowohl eine Verringerung der Nierendurchblutung durch Tumorkompression im Sinne eines Goldblattmechanismus als auch eine Stimulation der renalen Reninsekretion durch Katecholamine in Frage kommen können. Bei 2 unserer Patienten mit einem Phäochromocytom fand sich eine über die Norm gesteigerte Cortisolsekretion.
    Notes: Summary Seven of eight patients with pheochromocytoma showed elevated plasma renin activity (〉3 ng/ml/3 hr). Four of these seven patients simultaneously had abnormally high plasma aldosterone (〉120 pg/ml). It was found by selective determinations of plasma renin activity in both renal veins that two different mechanisms may be responsible for the observed hyperreninism. Firstly, the pheochromocytoma can lead mechanically to a reduction in renal blood flow inducing an increased renin secretion. Secondly, catecholamines are known to stimulate renin secretion. Two of the eight patients with pheochromocytoma showed an increased cortisol secretion.
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