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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 733 (1994), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les résultats de la localisation de tumeurs insulaires du pancréas par l'administration intraveineuse de deux analogues marqués de la somatostatine, le 123 I-Tyr3-octréotide et le 11 Inoctréotide, ont été analysés chez 25 patients. Les tumeurs primitives et des métastases, souvent méconnues jusqu'alors, ont été visualisées chez 20 des 25 patients (80%). Parallèlement, la détectionin vitro des récepteurs de la somatostatine des tumeurs ainsi visualiséesin vivo sont en faveur d'une liaison à la tumeurin vivo, spécifique des récepteurs en question. La détection de ces récepteursin vivo était un facteur prédictif d'un effet suppressif sur l'hypersécrétion hormonale des tumeurs. Il s'agit d'un moyen d'investigation facile, rapide et sûr de localiser les tumeurs endocrines primitives du pancréas ainsi que leurs métastases, souvent encore cliniquement et radiologiquement muettes.
    Abstract: Resumen Presentamos los resultados de la visualización de tumores insulares en 25 pacientes luego de la administración intravenosa de dos análogos de la somatostatina marcados con radioisótopos (123I-Ty3-octreótido y 111 In-octreótido). Los tumores primarios, así como las metástasis distantes, frecuentemente desapercibidas, fueron visualizados en 20 de 25 pacientes (80%). La detección paralelain vitro de receptores de somatostatina en tales tumores, que tambión habían sido visualizadosin vivo, indica que la ligazónin vivo representa ligazón a receptores específicos de somatostatina. La detección de receptores de somatostatina en estos tumoresin vivo predijo un buen efecto supresor del octreótido sobre su hipersecreción hormonal. El procedimiento es sencillo, rápido, libre de peligro y muy valioso en la localización de los tumores endocrinos primarios del páncreas, así como de sus metástasis, que frecuentemente permanecen ocultas en los exámenes radiológicos y clínicos.
    Notes: Abstract The results of visualization of the islet cell tumors of 25 patients after intravenous administration of two isotope-labeled somatostatin analogs (123I-Tyr3-octreotide and111In-octreotide) are described. The primary tumors, as well as previously often unrecognized distant metastases were visualized in 20 of the 25 patients (80%). Parallel in vitro detection of somatostatin receptors on those tumors that had also been visualized in vivo indicates that the ligand binding to the tumor in vivo indeed represents binding to specific somatostatin receptors. The detection of somatostatin receptors on these tumors in vivo predicted a good suppressive effect of octreotide on hormonal hypersecretion by these tumors. It is an easy, quick, harmless procedure that is valuable for localization of primary endocrine pancreatic tumors and their often radiologically and clinically not yet recognized metastases.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1619-7089
    Keywords: Somatostatin ; Octreotide ; Tumour targeting ; Receptor imaging ; Apudoma ; Lymphoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Various tumours, classically specified as either neuroendocrine or non-neuroendocrine, contain high numbers of somatostatin receptors, which enable in vivo localization of the primary tumour and its metastases by scintigraphy with the radiolabelled somatostatin analogue octreotide. In addition granulomas and autoimmune processes can be visualized because of local accumulation of somatostatin receptor-positive activated mononuclear leucocytes. In many instances a positive scintigram predicts a favourable response to treatment with octreotide. It is tempting to speculate that octreotide labelled with an appropriate radionuclide might be used in cancer therapy. The successful application of radiolabelled octreotide in scintigraphy indicates the possible usefulness of other radiolabelled peptides, either native peptides or derivatives of these, in, for example, nuclear oncology. The small size of these peptides, e.g. bombesin and substance P, is of the utmost importance for a relatively fast blood clearance, thus leading to low background radioactivity. In this way peptides are powerful alternatives to (fragments of) monoclonal antibodies, the application of which to scintigraphic localization of specific cell surface antigen-bearing tumours is plagued by slow blood clearance and, hence, high background levels.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nuclear medicine 6 (1981), S. 551-553 
    ISSN: 1619-7089
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To evaluate the use of 111indium-diethylene-triamine pentaacetic acid (111In-DTPA) for determination of the glomerular filtration rate (GFR), the results of 60 standard 111In-DTPA clearances were compared with 24-h urine endogenic creatinine clearances obtained on 3 successive days (r=0.97, P〈0.0001) and with endogenic creatinine clearances obtained during 111In-DTPA determinations (r=0.93, P〈0.0001). It is concluded that 111In-DTPA is a useful marker for GFR
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1619-7089
    Keywords: Captopril renography ; Renovascular hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The diagnostic work-up of renovascular hypertension is still controversial. The efficacy of renal scintigraphy with technetium-99m diethylene triamine penta-acetate (DTPA) before and after captopril (scintigraphic captopril test) was evaluated in a multicentre study. All 380 hypertensive patients in the study underwent renal arteriography; 125 had renal arterial stenosis ≥ 70%, and 54 had a technically successful intervention to correct the stenosis. The post-captopril study had a sensitivity of 93% and a specificity of 100% for predicting blood pressure response to intervention, if renal function was normal and a combination of quantitative parameters was applied (individual kidney uptake index 〈 40%, time to peak activity 〈 2 min or 〉 10 min). In the entire population renal artery stenosis ≥ 70% was detected with a sensitivity of 83% and a specificity of 93% if renal function was normal. In patients with abnormal renal function the performance of the test was worse, owing to a lower specificity which could be increased by using only time parameters. The performance of the test was optimal when the post-captopril findings were examined; no improvement was achieved by evaluation of the changes induced by captopril from the baseline. The test can thus be simplified by performing only a post-captopril study for routine use: a negative test would exclude a curable form of renovascular hypertension in 〉 80% and a positive test would predict it in 〉 90% of the patients selected for suspicion of the disease. Usefulness of the scintigraphic test for monitoring the clinical results of intervention is suggested by correlating post-intervention outcome with pre- and post-intervention scintigraphic results.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2161
    Keywords: Key words Digital subtraction ; Hip arthrography ; Hip arthroplasty ; Loose hip prosthesis ; Preoperative evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. The objective of this clinical study was to define the diagnostic value of plain radiography, digital subtraction arthrography and two-phase bone scintigraphy in patients with clinically loose or infected hip prostheses. Design. Digital subtraction arthrograms, scintigrams and plain radiographs of 70 consecutive patients who underwent revision hip arthroplasty were scored individually and in masked fashion for the presence or absence of features indicating loosening of femoral and/or acetabular components. The operative findings acted as the gold standard. Results. Digital subtraction arthrography was best (P〈0.001) for predicting a loose acetabular component, while no significant additional predictive value was found for plain radiographs (P=0.24) and scintigraphy (P=0.27). Digital subtraction arthrography was also the most important modality for predicting a loose femoral component (P=0.001), while the plain radiograph was of significant (P=0.04) additional value and scintigraphy was of no additional value (P=0.13) on multivariate analysis. Conclusion. Digital subtraction arthrography gives the best results in the prediction of loosening of acetabular and femoral components. Plain radiographs give additional information on loosening of the femoral component, but scintigraphy offers no additional advantage.
    Type of Medium: Electronic Resource
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