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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 122 (1976), S. 195-200 
    ISSN: 1432-1076
    Keywords: HGH secretion ; l-Dopa ; l-Carbidopa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei Kindern ohne Minderwuchs im Alter von 6–14 Jahren wurde nach oraler Gabe von 250 mg Levodopa und 25 mg l-Carbidopa (Nacom, ein Kombinations-präparat) die Wachstumshormonkonzentration im Serum bestimmt. Alle Probanden zeigten einen ausreichenden Wachstumshormonanstieg. Der Mittelwert betrug 19,6 ng/ml. Nach dem Maximum der HGH-Konzentration ließen sich zwei Gruppen unterscheiden. Die eine Gruppe erreichte zum Zeitpunkt 20 bzw. 40 min, die andere nach 60 bzw. 90 min den stärksten HGH-Anstieg. Aufgrund des Verlaufs der Mittelwertskurve werden 2 Blutentnahmen, 40 und 90 min nach Einnahme des Präparates, zum Ausschluß eines Wachstumshormonmangels für ausreichend gehalten. Das wahrscheinlich zugrundeliegende Wirkungsprinzip der HGH-Sekretion durch l-Dopa und l-Carbidopa wird anhand der Literatur diskutiert.
    Notes: Abstract The stimulatory effect of l-Dopa and l-Carbidopa (Nacom) on HGH secretion was determined in 12 children of normal height aged from 6 to 14 years. Each child received a standard dose of 250 mg l-Dopa and 25 mg l-Carbidopa p.o. HGH concentration in the serum was determined at standard intervals. All subjects showed a sufficient increase of HGH. The mean value was 19.6 ng/ml. According to the maximum values of the HGH concentration the sample can be divided into two groups; the first group reached the highest values after 20–40 min, the second one after 60–90 min. On evaluation of the curve of the mean values it appears that 2 blood samples taken 40 and 90 min after the ingestion of l-Dopa and l-Carbidopa are sufficient in order to exclude HGH deficiency. The theoretical background for HGH secretion after stimulation by l-Dopa and l-Carbidopa is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 127 (1977), S. 15-19 
    ISSN: 1432-1076
    Keywords: HGH secretion ; L-Dopa ; L-Carbidopa ; Arginine test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The stimulatory effect of Nacom® (250 mg L-Dopa and 25 mg L-Carbidopa) on the HGH secretion was evaluated in 75 short stature patients. The number of blood samples was restricted to only three (0, 45 and 90 min). 63 patients reached adequate HGH concentrations after the ingestion of 1 tablet Nacom (84%). Somatotropin levels increased from 2.08 (S x 0.28) to a maximal HGH value of 14.22 (S x 0.87) ng/ml. When the stimulatory effect of Nacom was compared with the standard method of arginine infusion in children with normal stature the arginine test was not superior to the Nacom-test. The Nacom-test appears to be a simple and reliable screening method for HGH deficiency, particularly in outpatients.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nuclear medicine 15 (1989), S. 1-8 
    ISSN: 1619-7089
    Keywords: Cerebral blood flow ; 99mTc-HMPAO ; 195mAu ; SPECT ; Three compartment model ; Uptake kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The activity concentrations of 99mTc-HMPAO in brain after intravenous injection were evaluated in 25 patients using SPECT. With additional first pass studies of heart and brain with the short lived isotope 195mAu, the cardiac output and the mean cerebral transit times of the patients were measured a short time before the HMPAO injection. The time dependence of 99mTc-HMPAO activity in the brain was registered during the first 5 min after injection over both hemispheres. Using a simplified three compartment model it was possible to calculate the mean retention fraction of HMPAO in brain from the time activity curves. It could be shown that the regional cerebral blood flow in ml/min per 100 g can be calculated from the activity concentration of HMPAO in the brain, the cardiac output and the retention fraction. In 15 of the 25 cases the rCBF was measured using the planar 133Xe inhalation method as a reference. We found a significant correlation between the mean hemisphere CBF from our method and the mean hemisphere grey matter CBF from the Xenon method with a correlation coefficient of 0.73.
    Type of Medium: Electronic Resource
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