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  • Essential thrombocythemia  (2)
  • Preleukemia  (2)
  • 99m-Tc-Pertechnat  (1)
  • 1
    ISSN: 1432-1440
    Keywords: Budd-Chiari syndrome ; Chronic myeloproliferative diseases ; Polycythemia vera ; Essential thrombocythemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Of 501 patients with chronic myeloproliferative diseases (c-MPD) 18 developed thrombosis of major abdominal vessels including 6 with hepatic vein thrombosis (Budd-Chiari syndrome). The complication was seen in 14 of 140 (10%) patients with polycythemia vera (PV), 3 of 23 (13%) patients with essential thrombocythemia (ET), 1 of 106 (1%) patients with idiopathic myelofibrosis (IMF), and none of 232 patients with chronic myelogenous leukemia (CML). Leading symptoms and signs were abdominal pain, progressive splenomegaly, widening abdominal girth, ascites, venous collaterals, and nausea and vomiting. The diagnostic modalities with highest specificity were angiography and explorative laparotomy. A causal relationship between the thrombotic event and hematocrit, thrombocyte count, or hemostatic abnormalities at the time of diagnosis could not be established. Detailed laboratory tests of platelet function and coagulation and fibrinolytic parameters of 5 surviving patients did not show any specific defect. Despite medical and surgical intervention, 39% of the patients died within 2 months after diagnosis of the thrombosis. The majority of the survivors developed further complications like liver cirrhosis with portal hypertension and esophageal varices or the short bowel syndrome after extensive bowel resection for mesenterial infarction.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: Key words Thrombopoietin ; Essential thrombocythemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Thrombopoietin (TPO) is the most important regulator of megakaryocyte development and platelet production. Platelet production is thought to be regulated by a negative regulatory feed back loop. In an attempt to evaluate the role of TPO in the pathobiology of essential thrombocythemia (ET), we have examined levels of TPO and other cytokines with thrombopoietic activity (interleukin-6 and interleukin-11) in sera obtained from 25 patients with ET (ten treated, 15 untreated) and 117 healthy control subjects. TPO serum levels were assessed using a sandwich-antibody ELISA that utilizes a polyclonal rabbit antiserum for both capture and signal. The mean serum TPO level in 25 ET patients was significantly elevated (545±853 pg/ml) as compared with that in healthy controls (95.3±54.0 pg/ml,p〈0.001). The difference in TPO serum levels between ten treated (781±1229 pg/ml) and 15 untreated ET patients (388±458 pg/ml) did not reach statistical significance (p=0.09). We conclude that either consumption or production of TPO is altered in ET. Failure of appropriate feedback regulation and continued megakaryocyte stimulation by an elevated TPO may play an important role in the pathobiology of ET.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 45 (1982), S. 243-248 
    ISSN: 1432-0584
    Keywords: Preleukemia ; T-cell mitogens ; NK cell activity ; Immune functions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The responses to the T-cell mitogens Phythemagglutinin (PHA) and Concanavalin A (ConA) and the natural killer (NK) cell activity are tested in patients with preleukemia (PL). The results are compared with those of healthy controls. The PL patients show low responses to T-cell mitogens and low NK cell activities. It is discussed that the data are not of prognostic value in PL as to development of overt leukemia. However, the results suggest that in PL impaired cell functions are not limited to erythropoiesis, granulopoiesis, and thrombopoiesis but are also found in the immune system.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 57 (1979), S. 21-29 
    ISSN: 1432-1440
    Keywords: Preleukemia ; Acute leukemia ; Prospective study ; Präleukämie ; Akute Leukämie ; Prospektive Studie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer prospektiven, multizentrischen Studie wurde der Verlauf bei 33 Patienten mit Präleukämie verfolgt. Kriterien für die Aufnahme in die Studie waren eine Anämie mit Granulo- und/oder Thrombozytopenie bei normal oder erhöht zellreichem Knochenmark und Ausschluß einer für diese Veränderungen verantwortlichen Grunderkrankung oder externen Noxe. Die kürzeste Nachbeobachtungszeit nach Stellung der Diagnose „Präleukämie“ betrug 3 Jahre. Die mediane Überlebenszeit war 26 Monate nach Ersterfassung und 36 Monate nach Erstsymptom der Erkrankung. Remissionen wurden nicht beobachtet. Bei 40% der Patienten wurde innerhalb von 2 Jahren nach Ersterfassung eine akute Leukämie diagnostiziert. Unter den geprüften prognostischen Faktoren sprachen vor allem Chromosomenaberrationen und ein erhöhter Blastenanteil für den Übergang in eine akute Leukämie.
    Notes: Summary The natural course of disease was followed in 33 patients with so-called preleukemia by a prospective multicentric protocol. Patients with the following criteria were included: Anaemia with granulocytopenia and/or thrombocytopenia, normal or increased cellularity of the bone marrow and exclusion of a known diagnosis of underlying disease. Follow up after assumption of “preleukemia” was 3 years or more. Median survival was 26 months after diagnosis of preleukemia and 36 months after the first unequivocal symptoms of the blood dyscrasia. 40% of the patients changed to the picture of leukemia within 2 years. The most important parameters suggesting subsequent transition to overt leukemia where chromosomal abberations and an increased blast count of the bone marrow.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 51 (1973), S. 141-142 
    ISSN: 1432-1440
    Keywords: Blood volume ; 99m-Tc-Pertechnetate ; 99m-Tc-Pertechnat ; Blutvolumen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurden Untersuchungen zur Bestimmung des Erythrocytenvolumens beim Menschen mit dem kurzlebigen Isotop 99m-Tc durchgeführt. Dabei zeigte sich, daß eine ausreichend stabile Markierung durch halbstündige Inkubation mit 99m-Tc und anschließende kurzzeitige Zugabe von SnCl2 erreicht werden kann. Die Inkorporationsrate ist vom Plasmaanteil und vom Hämatokrit der zu markierenden Erythrocytensuspension abhängig. Gleichzeitige Markierung derselben oder einer gleichen Probe mit51Cr ergab gut übereinstimmende Resultate für das Erythrocytenvolumen.
    Notes: Summary Incubation of human red cells with 99 m-Tc and subsequent addition of SnCl2 resulted in stable red cell labeling. Simultaneous tagging of the same or another red cell specimen by51Cr and calculation of the red cell volume from both isotopes gave almost identical results. The 99m-Tc-technique may become the method of choice for red cell volume determination.
    Type of Medium: Electronic Resource
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