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  • Articles: DFG German National Licenses  (2)
  • Key words ICA 69  (1)
  • Key words Single-chamber cardioverter/defibrillator – dual-chamber cardioverter/defibrillator – arrhythmia detection – sensitivity – specificity  (1)
  • 1
    ISSN: 1432-0428
    Keywords: Key words ICA 69 ; insulin-dependent diabetes mellitus; rheumatoid arthritis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Islet cell antigen (ICA) 69 is a newly-recognized islet cell antigen to which autoantibodies have been observed in prediabetic relatives of patients with insulin-dependent-diabetes mellitus (IDDM). Here we extend the earlier analysis of ICA 69 antibodies to patients with recent-onset IDDM and to patients with other immune-mediated diseases. ICA 69 antibodies were determined by Western blot using an affinity purified recombinant fusion protein of ICA 69 and maltose binding protein. ICA 69 antibody quantities were determined as titres using a titration curve of a standard serum as reference. Mean logarithmic ICA 69 antibody titres were 3.4 (± 1.4) in 99 patients with acute IDDM compared to 2.8 (± 0.9) in 49 healthy blood donors (p 〈 0.001). A higher mean ICA 69 antibody titre of 4.1 (± 0.8) was observed in 16 patients with rheumatoid arthritis in comparison to acute IDDM (p 〈 0.01) and healthy control subjects (p 〈 0.001). The percentage of sera with ICA 69 antibody titres above the 2 SD level of normal subjects was 21 % in IDDM, 31 % in rheumatoid arthritis and 6 % in healthy blood donors. None of the patients with autoimmune thyroid disease (n = 20), inflammatory bowel disease (n = 9) or multiple sclerosis (n = 7) had elevated ICA 69 antibodies. In IDDM, presence of ICA 69 antibodies persisted and the titre remained the same over 18 months of follow-up. The relationship of ICA 69 antibodies to islet cell antibodies (ICA) or insulin autoantibodies (IAA) was tested. The production of ICA 69 antibodies was not associated in diabetic patients with the presence of any of the two other autoantibodies. In conclusion, this study describes ICA 69 antibodies in acute IDDM and finds them to be independent of other islet autoantibodies. In addition ICA 69 is a target of humoural autoimmunity not only in IDDM but also in rheumatoid arthritis. [Diabetologia (1995) 38: 351–355]
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Herzschrittmachertherapie & Elektrophysiologie 11 (2000), S. II24 
    ISSN: 1435-1544
    Keywords: Key words Single-chamber cardioverter/defibrillator – dual-chamber cardioverter/defibrillator – arrhythmia detection – sensitivity – specificity ; Schlüsselwörter Einkammer-Kardioverter/Defibrillator – Zweikammer-Kardioverter/Defibrillator – Arrhythmiedetektion – Sensitivität – Spezifität
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung: Eine falsch-positive Erkennung atrialer Tachyarrhythmien als ventrikuläre Rhythmusstörungen mit der Konsequenz elektrischer Therapien stellt auch heute noch ein bedeutsames klinisches Problem in der Therapie mit implantierbaren Kardiovertern/Defibrillatoren dar. Die methodischen Limitationen einer einkanaligen frequenzgebunden Arrhythmiedetektion wurden durch die Einführung ergänzender Arrhythmiedetektionskriterien zu überwinden versucht. Neben den seit Jahren eingeführten, ergänzenden Detektionskriterien wie “Arrhythmiestabilität” und “Arrhythmieonset” wurden zusätzlich Detektionskriterien basierend auf der Morphologieanalyse der endokardialen Elektrogramme in die klinische Therapie mit implantierbaren Defibrillatoren eingeführt. Die Einführung von Zweikammer-Defibrillator-Systemen brachte neben der wichtigen Therapieoption einer physiologischen antibradykarden Stimulation die methodischen Voraussetzungen einer verbesserten Arrhythmiedetektion durch eine simultane Zwei-Kanal-Analyse atrialer und ventrikulärer Signale. In der vorliegenden Übersicht sollen die unterschiedlichen technischen Bedingungen der Arrhythmiedetektion in Einkammer- und Zweikammer-Defibrillatoren unter Einbeziehung der Mehrzahl der klinisch eingeführten ergänzenden Detektionskriterien und Algorithmen kurz zusammenfassend beschrieben werden. Weiter wird versucht eine Übersicht über publizierte Studien und Behandlungsergebnisse zur Sensitivität und Spezifität der Arrhythmiedetektion durch Einkammer und Zweikammer Defibrillatoren darzustellen.
    Notes: Summary False-positive detection of atrial tachyarrhythmias as ventricular arrhythmias, resulting in electrical therapy, is still a major clinical problem in implantable defibrillator therapy. The introduction of enhanced arrhythmia detection parameters tried to overcome the methodical limitations of a single-channel arrhythmia classification. In addition to the enhanced detection parameters, such as “arrhythmia-stability” and “arrhythmia-onset”, introduced several years ago, new additional detection parameters, based on the analysis of intracardiac electrogram morphology, were recently introduced in clinical defibrillator therapy. The introduction of dual-chamber defibrillators provide the important option of physiological antibradycardia pacing and the technical preconditions for an improved arrhythmia classification, based on the simultaneous dual-channel analysis of atrial and ventricular signals. This manuscript will give and an overview of the technical conditions of arrhythmia detection in single and dual-chamber implantable defibrillators with respect to the majority of the clinically used enhanced arrhythmia detection parameters and detection algorithms. Additionally a summary of published studies and clinical results regarding the sensitivity and specificity of arrhythmia detection in single and dual-chamber implantable defibrillator therapy is presented.
    Type of Medium: Electronic Resource
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