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  • 1995-1999  (134)
  • 1970-1974  (36)
  • 1965-1969  (30)
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  • 1
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 19 p. = 96 kB, text and images
    Edition: [Electronic ed.]
    Language: German
    Note: Contract no. BMBF 03F0153A; 03FO153A , nIndex , Differences between the printed and electronic version of the document are possible
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  • 2
    Online Resource
    Online Resource
    New York, NY :Springer,
    Keywords: Heart-Diseases-Molecular aspects. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (334 pages)
    Edition: 1st ed.
    ISBN: 9781461312895
    Series Statement: Developments in Molecular and Cellular Biochemistry Series ; v.19
    DDC: 612.1/73
    Language: English
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  • 3
    Online Resource
    Online Resource
    New York, NY :Springer,
    Keywords: Heart-Molecular aspects. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (313 pages)
    Edition: 1st ed.
    ISBN: 9781461312796
    Series Statement: Developments in Molecular and Cellular Biochemistry Series ; v.18
    DDC: 612.173
    Language: English
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 24 (1968), S. 340-341 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Arginine has been converted into a suitable pyrimidine derivative to permit its qualitative analysis in the presence of other amino acids by means of mass spectrometric and gas-chromatographic techniques.
    Type of Medium: Electronic Resource
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  • 5
    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.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1591-9528
    Keywords: Mean arterial blood pressure ; Heart rate ; Renal transport system ; Mittlerer arterieller Blutdruck ; Herzfrequenz ; Renales Transportsystem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei der narkotisierten vagotomierten Ratte wurde über 2 Std die Wirkung von intraperitoneal injiziertem Guancydin auf den mittleren arteriellen Blutdruck und die Herzfrequenz beobachtet. Hier konnte ein dosisabhängiger blutdruck- und frequenzsenkender Effekt nachgewiesen werden. Nephrektomierte Tiere oder Tiere mit doppelseitiger Ureterligatur und ureteroabdomineller Fistel sowie Tiere, die mit Probenecid vorbehandelt waren, zeigten im Vergleich zu den Normaltieren eine deutlich stärkere Ansprechbarkeit auf die gleiche Guancydindosis. 2 Std nach der Guancydingabe konnte zwischen den Blutdruckwerten der vorbehandelten Kollektive und dem mittleren Druckwert des Normalkollektivs eine hochsignifikante Differenz ermittelt werden (p〈0,001). Aus diesen Befunden wird gefolgert, daß Guancydin rasch durch die Nieren ausgeschieden wird und daß auf Grund der deutlichen Potenzierung der Guancydinwirkung durch Probenecid eine aktive Ausscheidung des Antihypertensivums in der Niere wahrscheinlich ist.
    Notes: Summary In anesthetized and vagotomized rats the effect of intraperitoneally injected guancydine on the mean arterial blood pressure and heart rate was observed over a time of 2 hrs. A dose-dependent hypotensive and heart rate lowering effect could be recorded. Nephrectomized animals or animals with bilateral ureteral ligature and ureteroabdominal fistula and animals, which were pretreated with probenecid, showed a significantly increased sensitivity to guancydine compared to the normal rats. 2 hrs after application of guancydine a highly significant difference could be observed between the mean blood pressure of the pretreated and the normal animals (p〈0.001). These results suggest, that guancydine is rapidly excreted through the kidneys, and that the secretion of this antihypertensive agent is an active process.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1591-9528
    Keywords: Mean arterial blood pressure ; Heart rate ; Renal transport system ; Mittlerer arterieller Blutdruck ; Herzfrequenz ; Renales ; Transportsystem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei Ratten, die mit Furosemid oder Mefrusid vorbehandelt worden waren, wurde über einen Zeitraum von 2 Std die Wirkung von intraperitoneal injiziertem Guancydin (25 mg/kg) auf den mittleren arteriellen Blutdruck und die Herzfrequenz beobachtet. Im Vergleich zu nichtvorbehandelten Tieren konnte eine deutliche Potenzierung der blutdruck- und herzfrequenzreduzierenden Guancydinwirkung nachgewiesen werden. Der Effekt war dosisabhängig, da 2 Std nach der Guancydingabe die mit 25 mg/kg Furosemid oder 50 mg/kg Mefrusid vorbehandelten Tiere einen signifikant niedrigeren Blutdruck aufwiesen als diejenigen, die vorher 12,5 mg/kg Furosemid oder 25 mg/kg Mefrusid erhalten hatten (p〈0,01). Es konnte wahrscheinlich gemacht werden, daß die Ursache für diesen Effekt weniger in einer diuretikumbedingten Veränderung des Wasser- und Elektrolythaushalts als darin liegt, daß Furosemid, Mefrusid und Guancydin über dasselbe renale Transportsystem ausgeschieden werden. Als Ausdruck einer Konkurrenz der Substanzen um dieses Transportsystem kam es möglicherweise zu einer Verzögerung der Guancydinausscheidung und somit zu einer verstärkten Wirkung des Antihypertensivums auf den Blutdruck und die Herzfrequenz. Diese Auslegung der Ergebnisse wird außerdem dadurch bestätigt, daß in weiteren Versuchen der diuretische und natriuretische Furosemideffekt durch Vorbehandlung mit Guancydin signifikant herabgesetzt werden konnte (p〈0,01). Dieser Effekt war gleichfalls dosisabhängig.
    Notes: Summary In rats, which were treated, with furosemide and mefruside, the effect of intraperitoneally injected guancydine (25 mg/kg) on the mean arterial blood pressure and the heart rate was studied over a period of 2 hrs. In comparison with, normal animals, a significant potentiation of the depressant effect of guancydine on heart rate and blood pressure was observed. This effect was dose dependent, since the animals, which were pretreated with 25 mg/kg furosemide or 50 mg/kg mefruside, showed a significantly lower blood pressure than rats, which received 12,5 mg/kg furosemide or 25 mg/kg mefruside (p〈0.01). It is suggested, that the causes of these effects were not the saluretic-induced alterations of the water and electrolyte balance but the fact, that furosemide, mefruside and guancydine are excreted by the same renal transport system. These findings were strongly supported by the fact, that in other experiments pretreatment with guancydine significantly lowered the diuretic and natriuretic action of furosemide (p〈0.01). This effect was also dose dependent.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of noninvasive electrocardiology 3 (1998), S. 0 
    ISSN: 1542-474X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study was designed to evaluate several alternative ECG measurements and provocative tests in order to identify markers for children with suspect congenital long QT syndrome (LQTS).〈section xml:id="abs1-2"〉〈title type="main"〉BackgroundA single QTc measurement on a resting ECG does not identify all children with LQTS. Alternative ECG measurements have been established for identification of LQTS patients, with varied degrees of accuracy. Additionally, findings of QT prolongation during exercise or catecholaminergic stimulation have been suggested as indicators for the presence of LQTS and associated arrhythmias.〈section xml:id="abs1-3"〉〈title type="main"〉MethodsThe ECGs from 40 children with suspect congenital LQTS were compared with 1000 gender and age matched control patients. Complete exercise ECG studies were performed on 32 of the 40 suspect LQTS patients and compared with 29 controls. ECGs recorded during isoproterenol infusion were obtained in 9 suspect LQTS patients and compared with 44 matched control subjects.〈section xml:id="abs1-4"〉〈title type="main"〉ResultsDuring exercise, the QTc was mildly prolonged in both groups, without a similar increase in JTc, suggesting prolongation of depolarization time. QT and JT dispersion shortened with exercise in control subjects, but not in the suspect LQTS patients. During isoproterenol infusion, the QTc and JTc are prolonged in the suspect LQTS group, without an increase in the control patients.〈section xml:id="abs1-5"〉〈title type="main"〉ConclusionsWe describe the ECG findings with provocative testing in patients in whom there is a clinical suspicion of LQTS, yet have a normal or borderline QTc. Exercise or isoproterenol may aid in identification of patients with congenital long QT syndrome.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 10 (1999), S. 0 
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Multisite Ventricular Pacing in Heart Failure. Introduction: We studied the effects on cardiac function of pacing two right and two left ventricular sites in normal and failing hearts with a normal QRS duration. Methods and Results: Hemodynamic parameters were studied in isoflurane-anesthetized dogs with normal hearts and dogs with heart failure induced by rapid ventricular pacing. Unipolar intramyocardial electrodes were placed at the high right atrium and the apex (A) and base (B) of the left (L) and right (R) ventricles (V). Data were collected after pacing for 5 to 20 minutes. In normal dogs, without bundle branch block (BBB), pacing at either the apex or the base of the left ventricle increased cardiac output by approximately 10% compared with right ventricular apex (RVA) pacing with an AV delay of 10 msec. Positive dP/dt increased approximately 10% during four-site left and right ventricular apex and base (LRVAB) pacing compared with RVA pacing. In dogs with heart failure but without BBB, cardiac output increased by 8.5% (P 〈 0.01) during four-site ventricular pacing with AV delays of 0 and 60 msec compared with RVA pacing. Positive dp/dt increased by 23.5% (P 〈 0.001) with an AV delay of 0 msec and 9.6% (P 〈 0.001) with an AV delay of 60 msec during LRVAB pacing compared with RVA pacing. His-bundle pacing was associated with increased cardiac output compared with RVA pacing. Conclusions: We conclude that pacing simultaneously at two right and two left ventricular sites significantly improves cardiac function compared with single RVA pacing, with or without sequential AV synchrony, in dogs with rapid ventricular pacing-induced heart failure and no BBB.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 16 (1968), S. 500-504 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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