Library

feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 15 (2000), S. 0 
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Objectives: The study describes the single-center experience using robot-assisted videoscopic mitral valve surgery and the early results with a remote telemanipulator-assisted approach for mitral valve repair. Material and Methods: Out of a series of 230 patients who underwent minimally invasive mitral valve surgery, in 167 patients surgery was performed with the use of robotic assistance. A voice-controlled robotic arm was used for videoscopic guidance in 152 cases. Most recently, a computer-enhanced telemanipulator was used in 15 patients to perform the operation remotely. Results: The mitral valve was repaired in 117 and replaced in all other patients. The voice-controlled robotic arm (AESOP 3000) facilitated videoscopic-assisted mitral valve surgery. The procedure was completed without the need for an additional assistant as “solo surgery.” Additional procedures like radiofrequency ablation and tricuspid valve repair were performed in 21 and 4 patients, respectively. Duration of bypass and clamp time was comparable to conventional procedures (107 Å 34 and 50 Å 16 min, respectively). Hospital mortality was 1.2%. Using the da Vinci telemanipulation system, remote mitral valve repair was successfully performed in 13 of 15 patients. Conclusion: Robotic-assisted less invasive mitral valve surgery has evolved to a reliable technique with reproducible results for primary operations and for reoperations. Robotic assistance has enabled a solo surgery approach. The combination with radiofrequency ablation (Mini Maze) in patients with chronic atrial fibrillation has proven to be beneficial. The use of telemanipulation systems for remote mitral valve surgery is promising, but a number of problems have to be solved before the introduction of a closed chest mitral valve procedure.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 17 (2001), S. 0 
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract  Objectives Redo mitral valve surgery via sternotomy is associated with a substantial morbidity and mortality. This study evaluated a minimally invasive technique for mitral valve redo procedures. Material and Methods: Out of a series of 394 patients undergoing mitral valve repair or replacement via a right minithoracotomy, 39 patients underwent redo mitral valve surgery (59 ± 13 years, 23 female). Previous cardiac surgeries included 17 patients with mitral valve repair, 6 patients with mitral valve replacement, 3 patients with aortic valve replacement, 2 patients with atrial septal defect closure, and 11 patients with coronary artery bypass grafting (CABG). In all cases, femoro-femoral cannulation was performed. The port access technique was applied in patients undergoing redo valve surgery. In patients with prior CABG, the operation was performed using deep hypothermia and ventricular fibrillation. Results: In all cases, sternotomy was avoided. The mitral valve was replaced in 20 patients and repaired in 19. Time of surgery and cross-clamp time were comparable with the overall series (168 ± 73 [redo] vs 168 ± 58 min and 52 ± 21 [redo] vs 58 ± 25 min). Mortality was 5.1%. One patient had transient hemiplegia due to the migration of the endoclamp. All other patients had uneventful outcomes and normal mitral valve function at 3-month's follow-up. Conclusion: Redo mitral valve surgery can be performed safely using a minimally invasive approach in patients with a previous sternotomy. The right lateral minithoracotomy offers excellent exposure. It minimizes the need for cardiac dissection, and thus, the risk for injury. Avoiding a resternotomy increases patient comfort of redo mitral valve surgery.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 809-811 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The local Ge composition in undulating Si0.8Ge0.2 layers on Si has been studied in a scanning transmission electron microscope using electron energy-loss spectroscopy. We observe Ge enrichment of the SiGe layer near the free surface (vertical Ge segregation in the growth direction) as well as Ge depletion of the ripple troughs compared to the peaks (lateral segregation). These lateral compositional fluctuations are likely to retard the generation of misfit dislocations and might be relevant to the Stranski–Krastanov growth of strained epitaxial alloy layers as well as to the self-organized growth of quantum dot structures. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics Letters 209 (1993), S. 455-458 
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics Letters 231 (1994), S. 64-69 
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 31 (1953), S. 1095-1096 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Es wurde ein einfaches Differenzverfahren zur flammenphotometrischen Serum-Calciumbestimmung beschrieben. Bei dieser Methode wird in jedes Serum eine bestimmte Menge Calcium eingewogen und aus der wiedergefundenen Calciummenge der Fehler, der durch das Serum verursacht wird, berechnet. — Diese Methode der Calciumanalyse ist genauer als die bisher geübten flammenphotometrischen-und einfacher und schneller als die bekannten chemischen Verfahren.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 196-201 (Nov. 1995), p. 505-510 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 173 (1978), S. 177-185 
    ISSN: 1433-8580
    Keywords: Collagen biosynthesis ; Cotton pellet granuloma ; Iron deficiency ; Kollagenbiosynthese ; Wattegranulome ; Eisenmangel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Gleichaltrige Wistarratten wurden unter Eisenmangeldiät gehalten, bis anfärbbares Eisen in den Eisendepots nicht mehr nachweisbar war. Nachfolgend wurden subkutane Wattegranulome gesetzt. Zur Charakterisierung der Kollagenbiosynthese in diesen Granulomen wurden das neutralsalzlösliche Kollagen und die Aktivität der Prolylhydroxylase 4, 8 und 12 Tage nach der Implantation im Gewebe bestimmt, gleichzeitig das „Collagen-like protein“ im Serum dieser Tiere gemessen. Die Enzymaktivität war am 4. Tage nach der Implantation in den Granulomen der Tiere unter eisenfreier Diät statistisch signifikant niedriger als in den Granulomen der vergleichbaren Gruppe, die unter normaler Fütterung stand. Es fand sich ein statistisch signifikant höherer Gehalt neutralsalzlöslichen Kollagens in den Granulomen der eisenfrei ernährten Tiere 8 und 12 Tage nach der Implantation. Die Serumspiegel des „Collagen-like protein“ waren zu keinem Zeitpunkt statistisch signifikant voneinander verschieden.
    Notes: Summary Rats of Wistar strain, of same age, were kept on iron free diet up to nearly absolute iron deficiency in iron depots. Afterwards granuloma was produced by implantation of cotton pellets subcutaneously. For characterization of the collagen biosynthesis in the granuloma the neutral salt soluble collagen and the activity of the prolyl hydroxylase were measured in the granuloma 4, 8 and 12 days after cotton pellet implantation. At the same time “collagen-like” protein was determined in the serum of the animals. The enzyme activity was statistically significant lower in the granuloma of animals on iron deficiency than in the granuloma of the comparable groups on normal diet. Statistically significant higher concentration of neutral salt soluble collagen was found 8 and 12 days after cotton pellet implantation in the group on iron free diet. There was no significant difference as to the serum levels of “collagen-like” protein in serum.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Der Anaesthesist 43 (1994), S. 786-790 
    ISSN: 1432-055X
    Keywords: Schlüsselwörter: Trauma – Kardiopulmonale Reanimation – Notarztsysteme ; Key words: Trauma – Cardiopulmonary resuscitation – Emergency medical systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract. Posttraumatic cardiopulmonary resuscitation (CPR) is associated with a poor outcome. When evaluating the literature according to the Utstein method, there were only 2 survivors (0.18%) out of 1,135 CPR attempts after trauma (Table 1). Differences in the study populations and levels of prehospital trauma care led us to analyse the results of a physician-staffed prehospital trauma care system in Cologne. Methods. From January 1987 to December 1990, a total of 49,054 emergency calls were registered using a standardised protocol. Among 9,595 trauma-related calls, 636 patients were found to be pulseless on arrival of the emergency team, 412 of these were pronounced dead. CPR was initiated in the remaining 224 patients, who comprise the study population (defined as 100%). All patients who were admitted to a hospital were followed using a second protocol. Results. CPR in the field was successful in 68 (30.4%) patients, who were then admitted to a hospital; 42 of these died within the first 24 h. Four patients (1.8%) could be discharged from hospital alive and were still living 1 year later, 1 with a lasting neurological deficit (Fig. 1). In 156 (69.6%) cases resuscitative attempts were unsuccessful in the field. Conclusions. Even in a physician-staffed prehospital trauma care system, the chance of surviving a post-traumatic cardiac arrest is minimal. Survival has to be regarded as an individual fate; the overall results are discouraging. Even though this study analyses the largest population of posttraumatic CPR ever published, prognostic factors could not be identified due to the few survivors. Nevertheless, the result does not justify general omission of CPR after trauma as: (1) prognostic factors for survival have not been identified thus far; and (2) no significant additional costs arise from posttraumatic CPR.
    Notes: Zusammenfassung. Für die präklinische kardiopulmonale Reanimation nach Trauma werden in der Literatur Überlebensraten zwischen 0% und 1,7% beschrieben. Die vorliegende Arbeit analysiert die Ergebnisse der Reanimation Schwerverletzter am Beispiel einer Millionenstadt mit einem organisierten Notarztdienst. Vom 01. 01. 1987 bis zum 31. 12. 1990 wurden vom Kölner Rettungsdienst 9595 Verletzte präklinisch behandelt. Von diesen waren 636 bei Ankunft des Notarztes pulslos, in 224 Fällen (definiert als 100%) wurde eine kardiopulmonale Reanimation begonnen. 68 (30,4%) Patienten konnten in ein Krankenhaus eingeliefert werden, vier (1,8%) wurden lebend entlassen. Ein Schwerverletzter mit Herz-Kreislaufstillstand hat eine nur minimale Überlebenschance. Auch bei maximaler präklinischer Therapie unter Einsatz eines Notarztes ist die Überlebensquote enttäuschend. Trotzdem darf nicht grundsätzlich auf eine Reanimation Schwerverletzter verzichtet werden, weil keine Prognosefaktoren zur Identifizierung potentiell Überlebender existieren und weil keine zusätzlichen signifikanten Kosten entstehen.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1432-0630
    Keywords: 68.55 ; 68.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The interface microstructure of AlAs/GaAs quantum wells grown by molecular beam epitaxy (MBE) was investigated by transmission electron microscopy (TEM). High-resolution transmission electron microscopy (HRTEM) yields information about the width of the chemical transition between the binary components and about the lateral step distances along the interface. The chemical composition is quantitatively determined by the application of a pattern recognition procedure based on the Fourier transformation of image unit cells. Along the 〈100〉 zone axis the composition across the interfaces is obtained with a precision of ±10 atomic percent and with a spatial resolution of 0.28 nm. Despite a lower chemical sensitivity a quantitative chemical analysis was also carried out for images along the 〈110〉 projection.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...