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  • Articles: DFG German National Licenses  (2)
  • 52.80.s  (1)
  • Antagonism  (1)
  • Tocolysis  (1)
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  • Articles: DFG German National Licenses  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 42 (1987), S. 155-160 
    ISSN: 1432-0649
    Keywords: 42.55.Gp ; 52.80.s ; 34.80.G
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Improved laser output is demonstrated in KrF and XeCl lasers with x-ray preionization. The influence of gas composition, preionization geometry, x-ray dose,E/p value and temporal delay between x-ray pulse and laser discharge is discussed. In XeCl lasing has been achieved with an x-ray dose of 0.2 mR whereas approx. 3 mR are required for KrF. For both systems, the highest output energy and the lowest possibleE/p ratio were observed with Ne buffered gas mixtures. Dissociative attachment to halogen molecules on a ns time scale supported by a relatively slow laser voltage rise is recognized as the main electron loss channel preventing a long lifetime of the preionization electrons. High preionization intensity is thus desirable at the moment of voltage breakdown.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 230 (1981), S. 231-237 
    ISSN: 1432-0711
    Keywords: Fenoterol-Tokolyse ; Tachykardie ; Betablocker ; Antagonisierung ; Tocolysis ; Betamimetic ; Tachycardia ; Betalytic ; Antagonism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary None of the betamimetics have an exclusively tocolytic effet. By stimulating the cardiovascular β-receptor, they also cause a substantial increase in the heart rate and a decrease in blood pressure. We administered 4–5 μg/min of Fenoterol to 13 patients during the first stage of labour. This led to complete inhibition of labour. To reduce cardiac side effects, a primarily cardiac β-blocker (5 mg Atenolol or 20 mg Metoprolol) was also given. The maternal and fetal heart rates were measured by ECG and by fetal scalp-electrode, respectively. The fetal heart rate remained largely unchanged, both during the Fenoterol infusion as well as during the additional administration of the β-blocker. The maternal heart rate, which increased under the influence of the Fenoterol, fell (p ≤ 0.01) but did not return to normal. In all cases the β-blockade led to a brief increase in uterine activity.
    Notes: Zusammenfassung Neben dem tokolytischen Effekt verursachen Betasympathikomimetika eine erhebliche Steigerung der Herzfrequenz und eine Blutdruckerniedrigung durch Stimulation der kardialen und vaskulären Betarezeptoren. Dreizehn Patienten erhielten während der Eröffnungsperiode 4–5 μg/min Fenoterol i.v. Nach vollständiger Wehenhemmung wurde wegen der unerwünschten Kreislaufreaktionen zusätzlich ein Betablocker mit vorwiegend kardialer Wirkung (Atenolol 5 mg oder Metoprolol 20 mg) verabreicht. Die Registrierung der Herzfrequenzen erfolgte über mütterliches EKG und fetale Skalpelektrode. Sowohl während der Fenoterol-Infusion als auch während der zusätzlichen Verabreichung des Betablockers änderte sich die fetale Herzfrequenz nur unwesentlich. Die Fenoterol-bedingte mütterliche Tachykardie konnte gesenkt (p ≦ 0,01), aber nicht vollständig aufgehoben werden. In allen Fällen führte die Betablockade zu einer kurzzeitigen Steigerung der Uterusaktivität.
    Type of Medium: Electronic Resource
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