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  • 1
    ISSN: 0014-5793
    Schlagwort(e): Calcium ; Endoplasmic reticulum ; Parotid gland ; Protein phosphorylation ; cAMP
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 66 (1988), S. 764-767 
    ISSN: 1432-1440
    Schlagwort(e): Catecholamines ; Clonidine ; Pheochromocytoma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In this study we examined the preoperative value of the clonidine-suppression test in 15 patients with surgically proved pheochromocytomas. The result of the clonidine-suppression test was pathological (epinephrine plus norepinephrine above 500 ng/l 3 h after clonidine) in 10 of 15 patients (66%). These patients had relatively large tumors and higher basal norepinephrine plasma levels. Out of the 5 cases without a pathological clonidine test 4 had normal basal plasma catecholamine levels with the result that the clonidine test could not be properly applied and 1 case produced a false negative result. These 5 cases generally had smaller tumors and lower plasma catecholamine levels. Two of these cases had basally raised epinephrine values. The other three cases had either a paradoxical increase or a suspiciously low fall (less than 25%) in norepinephrine within the normal range. We conclude that the clonidine-suppression test is only reliable for the diagnosis of relatively large pheochromocytomas.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1432-1440
    Schlagwort(e): Acromegaly ; Growth Hormone ; Somatomedin C ; Somatostatin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary This study examined the effects of the long-acting selective mini somatostatin analogue (SMS) 201-995 in two acromegalic patients who were treated for 3 and 6 months, respectively. During treatment the mean growth hormone levels (25.3 and 20.8 ng/ml vs 5.9 and 10.6 ng/ml) and somatomedin C levels (6.2 and 6.2 IU/ml vs 3.3 and 3.8 IU/ml) decreased and the patients reported an improvement in their symptoms. The main side effect was an increase in stool fat excretion which did exceed the normal range (〈7 g/day) in one patient. Five acromegalics who received 2 × 50 µg SMS 201-995/day for 5 days showed a significant increase of stool fat excretion (1.7 vs 3.5 g/day;p〈0.05). Fasting blood glucose levels, glucose tolerance, and glycosylated hemoglobin were not essentially effected. It is concluded that SMS 201-995 offers new possibilities in the treatment of acromegaly. The gastrointestinal and diabetogenic side effects of this substance, however, should be carefully monitored.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1432-1440
    Schlagwort(e): Pheochromocytoma ; Catecholamines ; Scintigraphy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In a retrospective study of 31 patients with suspected pheochromocytoma we examined the preoperative results of131I-metaiodobenzylguanidine (131-I-MIBG) scintigraphy and a fluorimetric urine catecholamine determination test. An additional radioenzymatic plasma catecholamine determination test was performed in 25 patients. In 14 of the 31 patients the diagnosis of pheochromocytoma was later histologically confirmed. In the remaining 17 patients the suspected diagnosis was finally rejected after a clinical decision had been made on the basis of clinical history, symptoms, laboratory and imaging tests. 131-I-MIBG scintigraphy apparently had a very high specificity (no false-positive results among the patients with rejected diagnosis), but showed the least sensitivity (3 of 14 tumours were not detected). Urine cate-cholamines showed two false-negative and three false-positive results. Plasma catecholamines had the highest sensitivity and gave only one false-positive result. Because of its high pathognomonic value 131-MIBG scintigraphy can be helpful not only for localization, but also for confirmation of diagnosis when catecholamine determination tests are contradictory. On the basis of our experience with false-positive results after interfering medication therapy, urine and plasma catecholamine determination tests should only be carried out after purification with thin layer chromatography or high performance liquid chromatography.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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