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  • Polymer and Materials Science  (2)
  • Bauchaortenaneurysma  (1)
  • COLOR DOPPLER  (1)
  • 1
    Keywords: evaluation ; Germany ; imaging ; QUANTIFICATION ; SYSTEM ; SYSTEMS ; VOLUME ; NEW-YORK ; ACCURACY ; SURGERY ; validation ; FLOW ; magnetic resonance ; MAGNETIC-RESONANCE ; magnetic resonance imaging ; VECTORS ; VECTOR ; SURFACE ; RECONSTRUCTION ; COLOR DOPPLER ; LACKING ; VOLUMES ; AORTIC REGURGITATION ; CARDIOVASCULAR-SYSTEM ; CONTROL-VOLUME METHOD ; INTEGRATION ; MITRAL REGURGITATION ; QUANTITATIVE ASSESSMENT ; resonance imaging ; respiratory system ; STANDARD ; VALVULAR REGURGITATION ; VELOCITY
    Abstract: Background. Three-dimensional assessment of regurgitant jet volume is the prerequisite for stratifying valve insufficiency. However, systematic comparison of three-dimensional methods is lacking. Therefore, we evaluated magnetic resonance imaging and three-dimensional echocardiography experimentally. Methods. An insufficiency chamber (22 x 18.5 x 27 cm; ostia 10, 16, and 20 mm; regurgitant volumes 2.3 to 25 mL) within experimental circulation (BioMedicus pump, tubes, pulsatile flow 0.2 to 1.9 L/min) was used for three-dimensional echocardiography (HP Sonos 2500) and magnetic resonance imaging (Siemens Magnetom Vision). Doppler flowmeter served as a gold standard. Segmentation used thresholding and surface integration of velocity vectors. jet volume was evaluated qualitatively by polynom fitting. Results. jet volume calculated by magnetic resonance (r = 0.99, p 〈 0.0001) and by echocardiography (r = 0.99, p 〈 0.0001) correlated identically to the gold standard. jet volume derived from imaging correlated with each other by r = 0.98 (p 〈 0.0001). Polynom fits indicated a more paraboloid shape of magnetic resonance jet volume. Conclusions. Experimentally, three-dimensional echocardiography and magnetic resonance imaging possess identical accuracy for determining regurgitant jet volume. Magnetic resonance imaging seems to provide qualitatively better image data for three-dimensional reconstruction. (C) 2004 by The Society of Thoracic Surgeons
    Type of Publication: Journal article published
    PubMed ID: 15223411
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  • 2
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Hydrocarbon-soluble oligomers were prepared by the acid-catalyzed condensation of alkylanilines with formaldehyde. Highest molecular weight oligomers (MW ∼ 6000) were obtained from alkylanilines prepared by the Friedel-Crafts alkylation of aniline with α-olefins. By NMR, it was shown that the oligomers contain structures corresponding to methylene-linked aromatic rings and methylene linked to both an aromatic ring and a nitrogen atom. The oligomers exhibit very good initial inhibition of metal corrosion in aqueous environment; and the inhibition is more persistent than that observed with monomeric analogs.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 369 (1986), S. 847-847 
    ISSN: 1435-2451
    Keywords: Abdominal aortic aneurysm ; Diagnosis ; Indication ; Operations ; Bauchaortenaneurysma ; Diagnose ; Indikation ; Operation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An der II. Chirurgischen Abteilung des AK Harburg wurden in 5 Jahren (1981–1985) 263 Patienten mit einem infrarenalen Bauchaortenaneurysma operiert. Im vorliegenden Film werden die Diagnostik beim Bauchaortenaneurysma, die Untersuchungstechnik und -taktik beim Hausarzt und in der Klinik vorgestellt sowie die Operation zweier Aneurysmen gezeigt. Postoperative Probleme, Risikofaktoren und Kontraindikationen zur Operation werden diskutiert.
    Notes: Summary At the 2nd Surgical Department of the Harburg General Hospital in Hamburg, Germany, 263 patients with infrarenal abdominal aortic aneurysms were operated on during a 5-year period from 1981 to 1985. The film demonstrates diagnostic procedures and evaluation techniques, as employed by the family physician and the clinician. Moreover, operations for two abdominal aneurysms are shown. Postoperative problems, risk factors, and contraindications against operative procedures are discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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