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  • 1
    Online Resource
    Online Resource
    Wiesbaden : Springer Gabler
    Keywords: Marktforschung ; Market research ; Market Research ; Aufsatzsammlung ; Marktforschung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (XVIII, 322 Seiten) , 44 Illustrationen
    Edition: 2., überarbeitete und aktualisierte Auflage
    ISBN: 9783658254490
    DDC: 658.83
    Language: German
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  • 2
    Online Resource
    Online Resource
    Wiesbaden : Springer Fachmedien Wiesbaden
    Keywords: Wirtschaft ; Marktforschung ; Business ; Market research ; Business and Management ; Market Research ; Marktforschung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (XVI, 331 S. 72 Abb)
    ISBN: 9783658145392 , 9783658123642
    DDC: 658.83
    RVK:
    Language: German
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  • 3
    Online Resource
    Online Resource
    Wiesbaden : Springer Gabler
    Keywords: Marktforschung ; Qualitätssicherung ; Business ; Market research ; Business and Management ; Market Research ; Marktforschung ; Qualitätssicherung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (XVII, 303 S. 33 Abb)
    ISBN: 9783658196608
    DDC: 658.83
    RVK:
    Language: German
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  • 4
    Online Resource
    Online Resource
    Wiesbaden : Springer Fachmedien Wiesbaden
    Keywords: Management ; Wirtschaft ; Marktforschung ; Economics ; Marketing ; Economics ; Market Research ; Marktforschung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (XIV, 333 S. 50 Abb)
    ISBN: 9783658054007 , 9783658053994
    DDC: 658.83
    RVK:
    Language: German
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 364 (1974), S. 357-364 
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Internal diameters of the cardiac orifices and of the great vessels were determined in 9 hearts with an atresia of the left atrio-ventricular orifice and/or the aortic ostium and in 7 hearts with an atresia of the right atrio-ventricular orifice and/or pulmonary ostium. Hearts which showed a ventricular septal defect in combination with a patent aortic ostium and left hypoplasia or a pulmonary ostium and right hypoplasia were not included in the material. Twenty-four normal hearts served as a control group. The aorta was measured at 6 sites; the pulmonary trunk, the two pulmonary arteries and the ductus arteriosus were all measured at one site. The age range of the material was from birth to 16 months after birth. Since cross-sectional areas of vessels appear more directly related to bloodflow than diameters and since absolute values of vessel calibres vary markedly with age squared values of internal diameters were expressed in normals as percentage of the sum total of the squared diameters of the pulmonary and the aortic ostium; in the hypoplasia material squared values of internal diameters were expressed as percentage of the squared value of the sole functioning ostium whether aortic or pulmonary. The aortic and pulmonary ostium showed cross-sectional areas of 222% resp. 188% of the normal value, when they functioned as sole outflow orifice. The pulmonary arteries did not evidence any deviation from the normal values neither in left, nor in right hypoplasia. The ductus arteriosus showed a supranormal value in left hypoplasia, but a normal value in right hypoplasia. Subnormal values were obtained for the pulmonary trunk in right hypoplasia, although the reduction in calibre was much more pronounced in the case of the comparable non-functioning first part of the aorta in left hypoplasia. In the latter condition the calibres of the aorta showed a grandual reduction from the descending aorta towards the ascending aorta which coincided with the direction of bloodflow in this cardiac malformation. These findings demonstrate appropriate functional adaptations of the calibres of the great vessels to conditions of altered bloodflow. The findings also indicate that a time factor should be taken into account in further analysis of such changes in vessel calibre.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 386 (1980), S. 303-316 
    ISSN: 1432-2307
    Keywords: Media ; Calibres ; Aorta ; Pulmonary trunk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a post mortem material of 17 cases of transposition of the great arteries (TGA) from patients with an age range from birth to two years and ten months after birth, the internal calibres of the great arteries and the ostia of the heart proved to be the same as in normal hearts. Furthermore, the media of the ascending aorta and pulmonary trunk showed no adaptation to the abnormal circulatory conditions in 15 cases of TGA with an age range from birth up to 51/2 months: in both great arteries the thickness of the tunica media and the packing density of its elastic fibres were the same as in normal hearts. However, adaptation of the tunica media of the pulmonary trunk to the abnormal circulatory conditions: increased media thickness, was found in the two remaining cases, older than 12 months. In 7 cases of pulmonary atresia (age from 1 day to 12 months) and in 9 cases of aortic atresia (age from 2 days to 37 days) the following observations were made. Vessels with reduced or absent function (ascending aorta in aortic atresia and pulmonary trunk in pulmonary atresia) showed a markedly different structure. In aortic atresia the internal calibre and thickness of the media of the ascending aorta were markedly reduced, whereas the packing density of the elastic fibres of the media remained the same as in normal hearts. In pulmonary atresia the pulmonary trunk showed large variations in internal calibre, whereas both media thickness and the packing density of its elastic fibres remained the same as in normal hearts. When the markedly enlarged single functional vessels (the pulmonary trunk in aortic atresia and the ascending aorta in pulmonary atresia) were compared no significant differences between their internal calibre, media thickness and the packing density of the elastic fibres were found indicating similar adaptation to the abnormal but comparable functional load of acting as sole arterial trunk.
    Type of Medium: Electronic Resource
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