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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 59 (1981), S. 1251-1259 
    ISSN: 1432-1440
    Keywords: Hyperparathyroidism ; Hemodialysis ; Renal osteodystrophy ; Hyperparathyreoidismus ; Hämodialyse ; Renale Osteopathie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 22 chronischen Hämodialysepatienten mit prädialytisch erhöhten PTH-Konzentrationen wurden Parathyreoidea-Suppressionstests unter simultaner Messung von Ca und PTH durchgeführt. Ca wurde durch Atomabsorptions-Spektralphotometrie, PTH radioimmunologisch gemessen. Während des akuten Anstiegs der Ca-Konzentration ergab sich eine enge, hochsignifikante Beziehung zwischen der absoluten Änderung der Ca-Konzentration und dem prozentualen Abfall der PTH-Konzentration. Auf zellulärer Ebene war damit bei allen Patienten dieselbe regulative Antwort auslösbar, unabhängig von der im einzelnen sehr unterschiedlichen absoluten Höhe der präsuppressiven PTH-Ausgangskonzentrationen. Dieses Ergebnis, zusammen mit anderen Befunden aus der Literatur, wurden dazu verwendet, den reinen regulativen Hyperparathyreoidismus als eine in typischen Phasen ablaufende Erkrankung zu beschreiben. Einige bisher unklare Phänomene des regulativen Hyperparathyreoidismus finden dann eine Erklärung, wenn exakt zwischen Regulation auf zellulärer und auf Organ-Ebene unterschieden wird. Die “klassische” Einteilung des Hyperparathyreoidismus in autonome und regulative Formen hat unserer Meinung nach auf zellulärer Ebene nach wie vor ihre volle Gültigkeit.
    Notes: Summary In a series of 22 patients undergoing chronic intermittend hemodialysis the response in secretion of parathyroid hormone (PTH) to an acute increase in serum calcium (Ca) concentration was studied. All patients had raised levels of predialysis PTH. Ca concentrations were measured by means of atomic absorption spectrophotometry and PTH concentrations were determined by radioimmunoassay. A close, significant, linear, negative correlation was demonstrated by regression analysis when Ca concentrations were correlated to changes in PTH, expressed as a percentage of the initial predialysis PTH value (100%). This finding supports the assumption that the function of the parathyroid gland at cellular level is similar in all patients, irrespective of very different predialysis PTH concentrations in peripheral blood. The results together with findings in literature were used to describe secondary hyperparathyroidism as a disease which shows typical phases during progression. Some still obscure phenomens of secondary hyperparathyroidism can be explained by discriminating between parathyroid function at a cellular and an organ level. The classification of hyperparathyroidism in regulative and autonomous forms only seems to be appliable when refered to the cellular level.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2013
    Keywords: Spontaneously hypertensive rat ; Calcitonin ; 1,25-dihydroxycholecalciferol ; Parathyroid hormone ; Phosphate metabolism ; Bone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In young spontaneously hypertensive rats (SHR) and in normotensive Wistar-Kyoto controls (WKY) several parameters of phosphate and calcium homeostasis were determined. At 6 and 8 weeks, blood analysis revealed a significant hypophosphatemia (p〈0.001) in SHR and twice as high plasma calcitonin levels in SHR than in WKY controls. At 8 weeks, 1,25-dihydroxycholecalciferol concentration was 20% higher in SHR (p〈0.02) while 25-hydroxycholecalciferol was unaltered (p〈0.51). In addition total immunoreactive PTH, iPTH, was slightly increased (p〈0.07) but intact PTH (1–84) (p〉0.90) was not significantly different from age matched WKY controls. Also at 8 weeks, a slightly reduced serum ionized Ca2+ concentration (p〈0.001) with no change in total serum calcium was found in SHR (p〉0.39). Balance studies at 6 and 8 weeks of age revealed no significantly different balances for phosphate (F=2.5,p〉0.10) and for calcium (F=2.6,p〉0.09), although a tendency for slightly more positive balaces existed in SHR when compared to WKY. However, SHR excreted significantly less phosphate in the urine than WKY control (F=0.2,p〈0.0009). Bone analysis was performed on femora of SHR and WKY of 6 weeks of age. Femora were significantly shorter in SHR (20.54±0.35 vs. 21.50±0.05 mm in WKY), whereas bone dry weight (127±6 vs. 107±2mg), bone ash weight (79±4 vs. 66±1 mg) and bone volume (0.196±0.007 vs. 0.165±0.004 cm3) were significantly greater in SHR. Calcium content per femur (717±35 vs. 617±11 μmol Ca/femur) and phosphate content per femur (512±23 vs. 447±8 μmol P/femur) were also significantly higher in SHR. It is discussed that the disturbances in phosphate homeostasis may be secondary to the strikingly increased plasma calcitonin levels present in young SHR.
    Type of Medium: Electronic Resource
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