Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1433-0563
    Keywords: Key words Pulmonary embolus • Intraoperative cardiac arrest • Intraoperative thrombolysis • Open cardiac massage • Renal cell carcinoma • Tumor embolisation • Intraoperative reanimation ; Schlüsselwörter Fulminante Lungenembolie • Intraoperativer Herzstillstand • Intraoperative Thrombolyse • Offene Herzmassage • Reanimation im Op • Embolisation des Nierentumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine 59 jährige Patientin fällt anläßlich einer Routineuntersuchung mit einem 12 × 9 cm durchmessenden, linksseitigen Nierentumor auf. Anamnestisch ist bei ihr eine Jahre zurückliegende, tiefe Beinvenenthrombose bekannt. Trotz bereits präoperativ eingeleiteter Antikoagulantientherapie kommt es im Verlauf der thorakoabdominalen Tumornephrektomie bei der Eröffnung der Pleurahöhle zu einem plötzlichen Herzstillstand infolge fulminanter Verlegung der Ausstrombahn des rechten Ventrikels. Eine 30 minütige, offene Herzdruckmassage gestattet in Verbindung mit einer sofort intraoperativ eingeleiteten rt-PA-Lysebehandlung via Pulmonaliskatheter durch den Anaesthesisten akut das Überleben. Der zunächst belassene Tumor wird im Anschluß an eine 14 tägige Stabilisierungsphase durch den Radiologen supraselektiv embolisiert und mit einer 3 monatigen Latenz progressionsfrei entfernt. Die postoperative Tumorformel lautet pT3,NO,MO,G2. Das Tumorgewebe war durch die Embolisation völlig devitalisiert. Das gleiche intraoperative Schicksal erlitt einige Monate später ein 76 jähriger, männlicher Patient am Ende einer Zystoprostatektomie mit Ureterokutaneostomie. Die sofortige Thorakotomie mit 45 minütiger, offener Herzmassage und intraoperativer Lysebehandlung nach den gleichen Kriterien konnte auch hier das Überleben sichern.
    Notes: Summary Intraoperativ pulmonary embolism with acute cardiac arrest can successfully be managed by immediate open cardiac massage followed by rt-PA injection, an interdisciplinary approach is mandatory. The scheduled tumor nephrectomy was performed 6 weeks after the initial event. The tumor was embolised with intravascular coils placed in a supraselective manner by the radiologist. During the secondary procedure it was found to be necrotic. In the second case the event occurred at the end of a radical cystectomy. Instead of an ileal conduit cutaneous ureterostomies were used for urinary drainage after cardiac output had been restored and rt-PA had been administered.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-0630
    Keywords: 61.16.Ch ; 43.35. + d ; 43.58. + z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Grating-like metal electrodes supplied with high- and low-frequency voltages were investigated by a Scanning Acoustic Force Microscope (SAFM). On piezoelectric LiNbO3, these electrodes form an interdigital transducer which generates surface acoustic waves according to the charge distribution on its electrodes when excited at a transducer's passband frequency. The influence of surface deformation and of surface charges on the cantilever deflection of the SAFM in contact and non-contact mode was systematically studied. Comparing the images of the electrodes which were prepared on piezoelectric and dielectric substrates, surface deformation and charge distributions were qualitatively separated.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-0630
    Keywords: PACS: 43.35.+d; 61.16.Ch; 68.35Ja; 68.60Bs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1432-0630
    Keywords: PACS: 61.16.Ch; 43.35.+d; 43.58.+z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Grating-like metal electrodes supplied with high- and low-frequency voltages were investigated by a Scanning Acoustic Force Microscope (SAFM). On piezoelectric LiNbO3, these electrodes form an interdigital transducer which generates surface acoustic waves according to the charge distribution on its electrodes when excited at a transducer’s passband frequency. The influence of surface deformation and of surface charges on the cantilever deflection of the SAFM in contact and non-contact mode was systematically studied. Comparing the images of the electrodes which were prepared on piezoelectric and dielectric substrates, surface deformation and charge distributions were qualitatively separated.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1432-0630
    Keywords: PACS: 43.38.+n, 85.50.+k; 61.16.Ch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 3 and quartz, and being operated at frequencies around 600 MHz. By employing SAFM, the local influence of the electrodes on the wave field, leading to undesired performance losses, was investigated.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1432-0630
    Keywords: PACS: 61.16.Ch; 43.35.+d; 43.58.+z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 7094-7099 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe an approach to scanning capacitance microscopy. A mixing technique is employed for imaging local capacitance variations simultaneously with the sample topography using an atomic force microscope (AFM) with a conductive tip. A SiO2/Si sample with lateral pn junctions formed by ion implantation has been investigated. Microwave signals incident on the metal–oxide–semiconductor (MOS) structure formed by the AFM tip and the sample give rise to mixing signals due to the nonlinear voltage dependence of the space charge capacitance in the Si. In our experiments two microwave input signals with frequencies f1 and f2 and a variable dc bias voltage were applied to the tip-sample MOS structure. The dependence of the generated sum frequency and third harmonic signals on the dc sample voltage shows that the f1+f2 and 3 f signals are proportional to dC/dV and d2C/dV2, respectively. Images of the sum frequency and third harmonic signals delineating the pn junctions on our model sample are presented and the dc bias voltage dependence of the images is discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present a detailed description of an experimental setup for alternating current scanning tunneling microscopy, in which two slightly detuned high frequency signals are mixed at the tunneling junction and the resulting difference frequency signal is amplified using conventional scanning tunneling microscope electronics. This signal is used to control the distance between the microscope tip and the sample. With graphite as a model surface atomic resolution images have been obtained. It is demonstrated that the origin of the generated signal on graphite is the nonlinearity of the static current–voltage characteristics. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 569-572 
    ISSN: 0142-2421
    Keywords: surface acoustic waves ; scanning force microscopy ; non-linear force curve ; SAW imaging ; ultrasound detection ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: We report on the investigation of surface acoustic wave (SAW) fields by scanning acoustic force microscopy (SAFM), reaching submicron lateral resolution. The SAFM is based on a standard atomic force microscope and utilizes the non-linear force curve in the sense of a mechanical diode. The surface oscillation therefore leads to a shift of the cantilever's rest position. With SAFM we investigated SAW transducers operating at frequencies above 600 MHz. We measured the dynamic behaviour of the wave pattern within the transducers when sweeping the frequency and found a local influence of mass loading on the standing SAW amplitude. Furthermore, the first images of SAW diffraction and scattering are shown.© 1997 John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1372-1374 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the submicron visualization of surface acoustic wave (SAW) fields within interdigital transducers (IDTs) obtained by a scanning acoustic force microscope. Utilizing the nonlinear force curve of the tip-to-surface interaction, a periodic deflection of the cantilever appears when the SAWs are excited intermittently. This deflection depends on the amplitude of the surface oscillation and was measured by lock-in technique. SAWs with operating frequencies above 600 MHz were detected. The influence of the mass loading on the local oscillation amplitude was studied for various layer thicknesses of the IDT electrodes. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...