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  • 1
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Gd-DTPA-BMA ; Magnetresonanztomographie ; Dynamische Studien ; Knochenläsionen ; Präoperative Chemotherapie ; Key words Gd-DTPA-BMA ; Magnetic resonance imaging ; Dynamic studies ; Bone lesions ; Preoperative chemotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Purpose: To evaluate the efficacy of high-dose Gd-DTPA-BMA (gadodiamide, Omniscan) as a contrast for magnetic resonance imaging of malignant bone tumors and the use of high-dose dynamic studies for predicting the response to preoperative chemotherapy. Materials and methods: Examinations were performed in 22 patients with suspected malignant bone tumor on a 1.5 T system. In 8 cases a follow-up examination was done after preoperative chemotherapy. Static studies included Pd- and T2-weighted spin-echo sequences as well as T1-weighted spin-echo sequences, obtained pre- and postcontrast. Dynamic studies were performed using a FLASH 2D-gradient-echo sequence (TR 40 ms/TE 10 ms, 90 ° flip angle) every 20 s after intravenous bolus injection of Gd-DTPA-BMA (0.3 mmol/kg body weight). MR images were evaluated qualitatively by visual assessment of conspicuity size, extraosseous delineation and structure of the lesion and quantitatively by measurement of the signal intensities and calculation of the relative increase in signal intensity. Results: Qualitative image analysis showed best demonstration of the lesions on contrast-enhanced T1-weighted images. Comparison of T1-weighted pre- and postcontrast spin-echo sequences revealed significantly better assessment of tumor structure after administration of contrast media. After preoperative chemotherapy, all responders showed a markedly stronger reduction in relative increase in signal intensity in dynamic studies compared to nonresponders. Conclusion: Gd-DTPA-BMA is effective for magnetic resonance imaging of musculoskeletal lesions and improves assessment of the tumor structure. Dynamic studies may help to predict the response to preoperative chemotherapy.
    Notes: Zusammenfassung Ziel der Studie: Untersucht wurde, ob die hochdosierte Gabe von Gd-DTPA-BMA (Gadodiamid, Omniscan™) sich für die kontrastmittelunterstützte Magnetresonanztomographie maligner Knochentumoren eignet und ob dynamische Studien bei dieser Dosis eine Beurteilung des Ansprechens auf eine präoperative Chemotherapie ermöglichen. Material und Methode: Die Untersuchungen erfolgten bei 22 Patienten mit Verdacht auf malignen Knochentumor bei einer Feldstärke von 1,5 Tesla. In 8 Fällen wurde eine Verlaufskontrolle nach präoperativer Chemotherapie durchgeführt. Die statischen Untersuchungen umfaßten PD- und T2-gewichtete Spinechosequenzen sowie T1-gewichtete Spinechosequenzen vor und nach Kontrastmittelapplikation. Dynamische Studien wurden mit einer FLASH-2D-Gradientenechosequenz (TR 40 ms/TE 10 ms, Flipwinkel 90 °) im Abstand von je 20 s nach intravenöser Bolusinjektion von Gd-DTPA-BMA (0,3 mmol/kg Körpergewicht) durchgeführt. Die Auswertung der MR-Bilder erfolgte qualitativ durch visuelle Beurteilung der Erkennbarkeit, der Größe, der extraossären Ausdehnung und der Struktur der Läsion und quantitativ mit Messung der Signalintensitäten und Berechnung des relativen Signalanstieges. Ergebnisse: Die qualitative Bildauswertung ergab für die T1-gewichteten Bilder nach Kontrastmittelapplikation die beste Erkennbarkeit der Läsion. Der Vergleich der T1-gewichteten Spinechosequenz vor und nach Kontrastmittelapplikation zeigte eine signifikant verbesserte Beurteilbarkeit der Tumorstruktur nach Kontrastmittelgabe. In den dynamischen Untersuchungen wiesen alle Responder nach präoperativer Chemotherapie einen deutlich stärkeren Abfall des relativen Signalintensitätsanstieges als die Nonresponder auf. Schlußfolgerung: Gd-DTPA-BMA ist ein effektives Kontrastmittel für die Magnetresonanztomographie muskuloskeletaler Läsionen und ermöglicht eine verbesserte Beurteilung der Tumorstruktur. Dynamische Studien können zur Beurteilung des Ansprechens der präoperativen Chemotherapie beitragen.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 39 (1990), S. 333-335 
    ISSN: 1432-1041
    Keywords: Isradipine ; renal function ; calcium antagonist ; healthy volunteers ; side effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The acute effect of a single oral dose of isradipine 5 mg on blood pressure, renal haemodynamics, electrolyte excretion and plasma renin activity was studied in 10 healthy males. Isradipine did not produce a significant change in systolic or diastolic blood pressure, and glomerular filtration rate, renal plasma flow, renal vascular resistance, and urinary albumin excretion remained constant. There was a marked natriuretic and diuretic effect about 1–3 h after isradipine. Plasma renin activity showed a slight, insignificant increase 1 h after dosing. Uric acid clearance and β2-microglobulin excretion showed no significant changes, despite an increase in sodium clearance, suggesting an additional mechanism of action other than the proximal tubular natriuretic effect of isradipine in normotensive volunteers.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2161
    Keywords: Key words Bone neoplasms ; diagnosis ; Magnification radiography ; Bones ; radiography ; Radiography ; comparative studies ; Radiography ; technology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To evaluate the potentials of magnification radiography as compared with conventional radiography in diagnosing bone tumors. Design and patients. Sixty-two patients with primary bone tumors and tumorlike lesions underwent radiography with both conventional (non-magnified) and magnification (fivefold) techniques. All radiographs were analyzed by four radiologists and the findings correlated with the histopathology findings. The microfocal X-ray unit used for magnification radiography had a focal spot size of 20–130 μm. Digital luminescence radiography was employed with magnification, while normal film-screen systems were used with conventional radiography. Results. The diagnosis of benign and malignant lesions as well as the individual tumor diagnosis were determined with higher accuracy using magnification compared with conventional radiography (88% vs 75% and 71% vs 52%, p〈0.01). Margins of destruction, periosteal reactions and matrix patterns were evaluated with higher certainty by all of the radiologists (p〈0.01). Conclusion. Magnification radiography may improve the evaluation and diagnosis of bone tumors.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2161
    Keywords: Key words Malignant fibrous histiocytoma ; Bone tumors ; MRI ; Conventional radiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To evaluate the conventional X-ray and MR imaging features of malignant fibrous histiocytoma (MFH) of bone. Design. MRI examinations and conventional radiographs were reviewed in 39 patients with biopsy-proven MFH. Imaging characteristics were analyzed and the differential diagnoses assessed in a masked fashion by two experienced radiologists. Results. Typical X-ray features included aggressive, destructive tumor growth centrally located in the metaphysis of long bones. Periosteal reactions and expansive growth were rarely seen. On MR images extraosseous tumor spread was frequently noted. On T2-weighted images and contrast-enhanced T1-weighted images most of the tumors displayed an inhomogeneous, nodular signal pattern with peripheral Gd-DTPA enhancement. Conclusions. Although several MR imaging criteria were typical for MFH none of them was specific. X-ray diagnosis of MFH may also prove difficult, with the main differential diagnosis being metastasis in the older and osteosarcoma in the younger population.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 520-523 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Konservierung von kosmetischen Mitteln und technischen Produkten stehen hochaktive Formulierungen auf Isothiazolon-Basis zur Verfügung. Methyl-isothiazolon-Formulierungen enthalten als antimikrobiell wirksame Majorkomponenten 2-Methyl-isothiazol-3-on und 5-Chlor-2-methyl-isothiazol-3-on sowie u. a. 4,5-Di-chlor-2-methyl-isothiazol-3-on als Minorkomponente. Als Wirkstoff in einer Octylisothiazolon-Formulierung liegt 2-n-Octyl-isothiazol-3-on vor. Das dünnschicht-chromatographische Verhalten dieser Substanzen wurde in verschiedenen Systemen vergleichend untersucht und gegenübergestellt. Zur Identifizierung können mehrere Detektionsmethoden eingesetzt werden, deren Farbreaktionen untersucht und zusammengestellt wurden. Die Nachweisgrenzen für die Isothiazolone liegen bei Anwendung der angegebenen Detektionsmittel im Bereich von 1 bis 20 μg.
    Notes: Summary Pwerful isothiazolone formulations are used to the preservation of cosmetics and technical products. The major antimicrobial active components of methyl isothiazolone formulations are 2-methyl-isothiazol-3-one and 5-chloro-2-methyl-isothiazol-3-one. 4,5-Dichloro-2-methyl-isothiazol-3-one was found among others as a minor com-ponent. The octyl isothiazolone formulation contains 2-n-octyl-isothiazol-3-one as its active ingredient. The chemical behaviour of these substances was compared by thin-layer chromatography using different systems. Several detection methods for the determination were investigated and listed. The detection limits of isothiazolones are 1 to 20 μg when using those detection methods.
    Type of Medium: Electronic Resource
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