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  • Argon laser-induced thermal injury  (1)
  • Endoscopic dissection  (1)
  • Endoscopic surgery  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 253 (1993), S. S83 
    ISSN: 1432-0711
    Keywords: Laser ; Tissue effect ; Endoscopic surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Lasers provide the endoscopic surgeon with a sophisticated tool for high precision cutting, destruction of tissue and coagulation. The laser allows efficient and time-saving operating techniques. Various laser systems emitting at different wavelenghts are available. The absorption of the laser is determined by the tissue properties, such as water content or pigmentation, and varies strongly with the wavelength. Each laser offers advantages for the treatment of specific disorders. Further data from clinical studies are required to evaluate whether the advantages found in experimental studies are of significance in clinical use.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Surgical endoscopy and other interventional techniques 10 (1996), S. 128-132 
    ISSN: 1432-2218
    Keywords: VATS ; Mediastinal lymph node ; Endoscopic dissection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Feasibility, completeness, and morbidity of videoscopic-assisted mediastinal lymph node dissection (VATS MLND) were compared to the standard surgical technique in an experimental study. Methods: Right upper MLND—together with upper lobectomy in half of the cases—was performed in ten large white pigs. Six animals were operated using VATS (group 1), four using conventional open techniques (group 2). After 1 week, the animals were sacrificed and the mediastinum was assessed for remaining lymph nodes. Results: All animals survived without intra- or post-operative complications. There was no significant difference in the operation time between the two groups (3.2±0.8 vs 3.2±0.2 h). The number of mediastinal lymph nodes harvested was 9.5±2.7 in group 1 and 11.5±0.5 in group 2 (n.s.). The post-mortem assessment of the mediastinum showed in two animals of group 1 and in two animals of group 2 that one lymph node was left behind. In addition, in one animal of group 1 four small retrotracheal lymph nodes were found. Conclusions: VATS MLND can be accomplished without morbidity and is as radical as that achieved with conventional surgery in the paratracheal and peribronchial areas in this experimental setting. However, retrotracheal lymph node dissection might not be as complete as achieved by conventional surgery.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 253 (1996), S. 193-200 
    ISSN: 1434-4726
    Keywords: Fiberoptic argon laser stapedotomy ; Skeeter microdrill stapedotomy ; Inner ear ; Temperature measurements ; Argon laser-induced thermal injury
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Since 1992 a small air-cooled opthalmological argon laser (Augus system, 3 W max.) equipped with a fiberoptic microhandpiece has been used for stapedotomy at the Inselspital, Berne. The microhandpiece has been developed especially for otological purposes in our electronic laboratory. In order to measure the effect of argon laser pulses applied through the handpiece to the ear, we performed temperature measurements in a saline-filled inner ear model by using ultrathin (2 μm thick), ultrafast (4 ns) thermosensitive rhodamine-coated polyurethane films. Multiple laser pulses of 1–2.5 W and 0.1 s duration — as used in clinical applications — produced a temperature elevation of about 1 ° C in the liquid of the inner ear model. The local laser effect was then examined histologically on the isolated stapes. The thermal damage zone around the stapedotomy perforation was limited to about 100 μm. In a clinical study we compared the results of argon laser stapedotomy (n = 54) with those of a skeeter microdrill stapedotomy (n = 29). Substantial hearing gains were found in all cases in both groups. In the laser stapedotomy group the mean residual air-bone gap (0.5–2 kHz) was 10 dB or less in all cases but one. Inner ear function remained unchanged except for a 40-dB loss at 4000 Hz in one case. Transient vertigo with nystagmus occurred in one case. Facial nerve dysfunction did not occur in any patient. The most important advantage of the laser found was the absence of mechanical trauma to the stapes. Stapes luxation and a floating footplate were avoided. In contrast, thick footplates were more easily perforated with the skeeter. Use of an argon laser equipped with a fiberoptic microhandpiece and a skeeter microdrill as needed seems particularly advantageous for stapedotomy.
    Type of Medium: Electronic Resource
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