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  • 1
    ISSN: 1432-1076
    Schlagwort(e): Respiratory distress syndrome ; Stable microbubble test ; Surfactant-associated proteins ; Phospholipids
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract With the advent of surfactant replacement therapy, there is an increasing need for a rapid test of predicting the development of respiratory distress syndrome (RDS). We evaluated the clinical usefulness of the stable microbubble (SM) test in predicting the development of RDS by comparison with other tests in amniotic fluid samples obtained within 12h before delivery from 40 pregnancies between 23–35 weeks of gestation. These tests included the lecithin/sphingomyelin (L/S) ratio, disaturated phosphatidylcholine/sphingomyelin (DSPC/S) ratio, concentrations of lecithin, DSPC, and surfactant-associated proteins A and B, C (SP-A, SP-B,C). The cut-off value of each test for predicting RDS was determined at a point of maximum diagnostic accuracy. The overall diagnostic accuracy of the SM test was similar to that of other tests. However, both the SM test and the SP-B,C concentration had positive predictive values of 100%. We conclude that the rapid (〈10 min) and reliable information obtained by this test should encourage its use in defining a population of neonates with surfactant deficiency in a multicentre trial of prophylactic surfactant therapy.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1432-1076
    Schlagwort(e): Respiratory distress syndrome ; Pulmonary surfactant ; Stable microbubble test ; Amniotic fluid ; Gastric aspirate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We determined prospectively if the stable microbubble (SM) test on gastric aspirate obtained at birth was as useful as that on amniotic fluid in predicting respiratory distress syndrome (RDS). One hundred and five paired samples of amniotic fluid obtained at delivery from 105 consecutive women with gestation of 35 weeks or less and gastric aspirates from their neonates obtained within 30 min of birth were studied. The SM test with the predefined cut-off value of less than 5 bubbles/mm2 for amniotic fluid and less than 10 bubbles/mm2 for gastric aspirate signified the risk of RDS with the positive predictive value of 100% and 96% and with the negative predictive value of 91% and 84%, respectively. We conclude that the SM test on both amniotic fluid and gastric aspirate obtained at birth is a rapid (〈10 min), simple and reliable procedure for predicting neonates who will develop RDS. It may be used as a bedside test to define a population of neonates with surfactant deficiency in clinical trials of prophylactic surfactant therapy.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 230 (1983), S. 105-111 
    ISSN: 1432-0878
    Schlagwort(e): Heart ; Purkinje fibre ; Innervation ; Ultrastructure ; Scanning electron microscopy ; Transmission electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary An observation of intimate nerve-Purkinje fibre associations in false tendons of sheep heart is reported. Nerve bundles were observed in deep clefts of Purkinje fibres, in channels running between coupled Purkinje cells and embedded within Purkinje cells, as well as in the outer connective tissue sheath. Most nerve terminals in these areas were filled with small clear vesicles and a few large dense-cored vesicles. Only a few axons with many small dense-cored vesicles were observed. Intimate associations (separation, 60 to 90 nm) between the Purkinje cell and nerve varicosity were observed in the deep clefts. Similar close appositions were also present where nerves were embedded in Purkinje cells. In these cases the Purkinje cell enclosing the nerve bundle formed intercellular junctions with its own sarcolemma. Elaborate sarcolemmal folds with multi-vesicular bodies were also frequently observed near nerve bundles and varicosities. The identity of the transmitter is unknown although the nerves forming intimate associations with Purkinje cells have a morphology typical of cholinergic nerves.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 232 (1983), S. 97-110 
    ISSN: 1432-0878
    Schlagwort(e): Purkinje fibers ; Scanning electron microscopy ; Transmission electron microscopy ; Diastole ; Systole ; Myofibrils ; Contraction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Previous attempts to study the cytoarchitecture of cardiac Purkinje fibers with the scanning electron microscope (SEM) have been limited by the surrounding dense connective tissue. In this study the connective tissue was removed by treatment with 8N HCl, after adult sheep hearts were fixed in diastole or systole and tissue taken for SEM and transmission electron microscopy (TEM). In SEM, Purkinje fibers freely anastomosed in false tendons and formed a subendocardial plexus. In systole, medium and small-sized Purkinje fibers formed deep clefts not observed in diastole. The clefts are thought to be due to sarcolemmal folding and fiber buckling and may therefore affect conduction. The myofibrils beneath the laterally apposed sarcolemmas of adjacent Purkinje cells when fixed in systole were often observed as tightly curved arches in series. Similar configurations with expanded arches were observed in diastole. The formation of arches by myofibrils is unique to Purkinje fibers and is interpreted as the mechanism responsible for their compliance to stretch. The significance of contraction in producing the observed geometric changes in Purkinje fibers and the implications of their cytoarchitecture with respect to conduction are discussed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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