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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Gefässchirurgie 3 (1998), S. 11-13 
    ISSN: 1434-3932
    Keywords: Schlüsselwörter a.v.-Shunt ; Arterioarterielles Interponat ; Key words Arteriovenous shunt ; Arterio-arterial interposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract We report on two patients who received arterio-arterial PTFE grafts as vascular access for chronic hemodialysis. In both patients prior surgery for arteriovenous fistulas using either subcutaneous veins or arteriovenous, artificial PTFE grafts had failed due to recurrent thrombosis and septic complications. The arterio-arterial grafts were each positioned as a subcutaneous loop on the thigh and anastomosed with the common femoral artery and the superficial femoral artery or the profunda femoris, respectively. Postoperatively, both patients received coumadine for anticoagulation. Nine months after surgery no complications were observed in the former patient. The latter patient experienced recurrent thrombotic occlusion of the graft and a new graft was required which was anastomosed end-by-end onto the common femoral artery. As yet, 5 months after the second operation, no further complications have been reported. In conclusion, in patients lacking suitable veins for arterio-venous anastomoses, artificial arterio-arterial grafts may provide vascular access for chronic hemodialysis.
    Notes: Zusammenfassung Bei 2 Patienten bestand nach Ausnutzung der subcutanen Venen sowie verschiedener Möglichkeiten a.v.-Interponate erneut der Bedarf eines Dialysezugangs. Es erfolgte die Anlage eines arterioarteriellen Interponats (PTFE) als Schlinge am Oberschenkel zwischen der A. femoralis communis und der A. profunda femoris bzw. A. femoralis superficialis. Beide Patienten wurden postoperativ antikoaguliert. Das Interponat im Bereich der A. femoralis superficialis funktioniert neun Monate nach Anlage unproblematisch. Bei dem Interponat zur A. profunda femoris kam es wiederholt zum Verschluß, so daß nach 6 Monaten an der gleichen Extremität ein neues Interponat terminoterminal im Bereich der A. femoralis communis angelegt wurde. Diese neue Interponat wird fünf Monate nach Anlage problemlos für die Dialyse genutzt. Arterioarterielle Protheseninterpositionen als Dialysezugänge können somit bei nicht geeigneter venöser Abflußbahn für die chronische Dialyse genutzt werden.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 99-104 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica A: Statistical Mechanics and its Applications 157 (1989), S. 983-999 
    ISSN: 0378-4371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part A: Physiology 92 (1989), S. 125-128 
    ISSN: 0300-9629
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 25 (1976), S. 381-389 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this contribution we use a generalization of Bogoljubov's variational principle, in order to develop a molecular field theory of the Hubbard model, which becomes asymptotically exact in the strong coupling limit. For this purpose the Hamiltonian is rotated by a unitary two-particle transformation in a way which was previously introduced by Kapustin, before the variational principle is applied.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 26 (1977), S. 177-185 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From a new variational approach to the Hubbard model, communicated previously [1], we derive the magnetic strong-coupling properties for the half filled band case of the Hubbard model in simple cubic lattices. The transition temperature from an AB-antiferromagnetic to a paramagnetic state, the sublattice magnetization and the localization of magnetic moments are investigated in detail. Near the strong coupling limit the results become asymptotically exact in a molecular field sense but they look reasonable even outside this asymptotic region.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 34 (1979), S. 117-122 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the equivalence between Feyman's and Bogolubov's variational principle, we discuss in the formalism of Hamiltonian quantum mechanics an improved upper bound for the free energy which has been given recently by Zeile using path integral methods. We show that Zeile's variational principle does not guarantee a thermodynamically consistent description.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Heart rates and activity were monitored over 24 h in unrestrained, incubating Adélie penguins (Pygoscelis adeliae) exposed to natural conditions in the colony. Heart rate (HR in bpm) increased linearly with wind speed (w; range 0–19 m/s): HR = 85.8+1.35 w, but was unrelated (P〉0.05) to temperature (-2.5°–6°C), humidity (37%–100%) cloud cover (0–8/8) and estimated solar radiation (0–12). Wind-induced heat loss was apparently compensated to a large degree by increased metabolic activity. Activity (A) measured as frequency of standing per hour, decreased linearly with temperature (t) and wind speed (w): A = 1.651−0.033w−0.090t. After correcting for meteorological influences, heart rate and bird activity showed no diurnal periodicity. When incubating, metabolism and activity of Adélie penguins appear to be mainly governed by climatic variations.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Transplant international 13 (2000), S. 372-378 
    ISSN: 1432-2277
    Keywords: Key words Liver transplantation ; Arterial complications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract From September 1988 through April 1998, 1000 liver transplantations were performed on 911 patients. During the postoperative control examinations of 837 patients, we found 23 (2.74 %) with hepatic artery thromboses, 27 stenoses of the hepatic artery (3.22 %), and 6 aneurysms of the graft artery. Seventeen patients underwent retransplantation because of arterial complications. Depending on the clinical symptoms, we treated both the local situation as well as the resulting complications of inadequate arterial graft flow. The aneurysms were primarily treated surgically. The first choice of treatment of stenoses was balloon angioplasty. Early postoperative artery thromboses were also treated surgically by thrombectomy in selected cases. For the resulting biliary and local septic complications we preferred endoscopic and drainage procedures. Our clinical experiences have led us to find pretransplantation angiography recommendable, especially in the case of splanchnic artery stenoses, for bypassing from the aorta for arterial perfusion of the graft.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1434-3932
    Keywords: Key words Peripheral resistance ; Intraoperative resistance measurement ; Extracorporal bypass flow ; Rutherford-Score ; Infrainguinal reconstructions ; Schlüsselwörter Peripherer Strömungswiderstand ; Intra-operative Widerstandsmessung ; Extrakorporaler Bypassflow ; Rutherford-Score
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Höhe der Korrelation zwischen präoperativ angefertigter Angiographie und dem tatsächlichen Abstromwiderstand wird kontrovers beurteilt. Insbesondere bei der Beurteilung der Gefäßsituation am Unterschenkel vor Anlage eines femoroinfragenualen Bypasses bestehen häufig Unsicherheiten, ob der Abstromwiderstand einen ausreichenden Blutfluß ermöglicht. In der vorliegenden Untersuchung ist die Korrelation zwischen Angiographie und intraoperativ gemessenem peripheren Widerstand untersucht worden. Neben Berechnung der linearen Korrelation wurde versucht, mit Hilfe der multiplen linearen Regressionsanalyse (MLR) prädiktive Modelle zur Abstromberechnung aus den Angiographien zu entwickeln. Dazu wurden sie nach dem von der amerikanischen Gesellschaft für Gefäßchirurgie eingeführten „Rutherford-Score“ graduiert. Der intraoperative Abstromwiderstand wurde mit Hilfe des extrakorporalen Bypassflowverfahrens (EBF) gemessen. Die ermittelten Widerstände lagen zwischen 0,14 und 2,5 PRU (peripheral resistance unit). Die globale Korrelation zwischen Angiographie und Abflußwiderstand betrug rs = 0,34 (p〈0,05). Mit der MLR konnte nur für die A. poplitea ein prädiktives Modell erstellt werden. Bei den anderen Gruppen konnten keine weiteren Formeln aufgestellt werden. Die Korrelation zwischen Angiographie und intraoperativ gemessenem peripheren Gefäßwiderstand ist insgesamt als schwach positiv einzustufen. Daher sollte man die Angiographie, die derzeit als der Golden Standard in der Gefäßdiagnostik gilt, in bezug auf ihre Aussagefähigkeit über den Abstromwiderstand vorsichtig bewerten. Es besteht kein sicherer Zusammenhang zwischen Angiographie und peripherem Widerstand. Möglicherweise lassen sich die bestehenden angiographischen Scoringsysteme durch Beachtung des distalen retrograden Abstroms in ihrem Aussagewert steigern.
    Notes: Abstract The correlation between angiography and vascular resistance measured during surgery is still controversial. Peripheral resistance in 40 infra-inguinal reconstructions was measured using a new method which integrates pressure and flow measurement into a temporary bypass system. Data are therefore collected under maximal physiological conditions using the patients' own blood and pulsatile blood flow. The angiographies were scored according to the recommendations of the Ad Hoc Committee on Reporting Standards, Society for Vascular Surgery, International Society for Cardiovascular Surgery (SVS/ISCVS). To estimate the association between angiography and resistance both simple cor-relation and multiple regression analyses were computed. The overall correlation coefficient was r s = 0.34 (P〈0.05). Multiple regression analysis only revealed a prospective model for the popliteal artery. The results indicated that there is a poor correlation between angiography and peripheral resistance.
    Type of Medium: Electronic Resource
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