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  • 1990-1994  (3)
  • Auditory brainstem responses  (2)
  • Laparoscopic colorectal surgery  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Maturation of auditory evoked potentials in young guinea pigs with binaural conductive hearing loss (1993)
    Springer
    European archives of oto-rhino-laryngology and head & neck 250 (1993), S. 362-365 
    Details
    ISSN: 1434-4726
    Keywords: Auditory maturation ; Conductive hearing loss ; Auditory brainstem responses ; Middle latency responses ; Guinea pigs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A reversible conductive hearing loss produced during the first 4 weeks post partum caused marked alterations in the development of click-evoked auditory brainstem (ABR) and middle latency (MLR) responses in guinea pigs. The early component PI in the ABR in controls showed adult-like latencies at the time of birth, while the later ABR components PIII and PV and all components investigated in the MLR showed postnatal development characterized by a shortened latency that persisted for the whole period of investigation. The course of the ABR latencies showed the sharpest decrease during the first 2–3 weeks of life, while that for the MLR took place during the first 5 weeks. In addition to the increased ABR thresholds and lengthened ABR latencies due to the conductive hearing loss, development of the ABR inter-peak latencies (IPL) and MLR latencies was retarded. The IPL reached control values 1 week after the end of the deprivation phase, while the delay in MLR started later (4th week) and lasted longer than did that in the ABR. These findings showed that a long-lasting postnatal conductive hearing loss does not generate sustained impairment at the level of the brainstem but can evoke longer-lasting deficiencies at higher stations of the auditory pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188388
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Intrakorporale kolonanastomose mit laparoskopischer tabaksbeutelnahtklemme und Valtrac-ring (1994)
    Springer
    Langenbeck's archives of surgery 379 (1994), S. 188-192 
    Details
    ISSN: 1435-2451
    Keywords: Laparoscopic colorectal surgery ; Valtrac ring ; Laparoscopic purse-string suture clamp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine neu entwickelte laparoskopische Tabaksbeutelnahtklemme bietet in Kombination mit dem biofragmentierbaren Valtrac®-Ring die Möglichkeit, Anastomosen im Dünn- und Dickdarm intrakorporal ohne Stapler zu erstellen. Im Rahmen der hier vorgestellten tierexperimentellen Studie wurde bei 5 Schweinen eine End-zu-End-Anastomose im Colon descendens gebildet. Die Nachuntersuchung erfolgte bei 4 Tieren nach 21 Tagen und bei einem Tier am 1. postoperativen Tag. Eine Anastomoseninsuffizienz war in keinem Fall festzustellen. Die Anastomosen der Tiere, die 3 Wochen postoperativ nachuntersucht wurden, wiesen sowohl makroskopisch als auch histologisch nur geringe Narbenbildung auf. Die hier vorgestellte Anastomosentechnik könnte in Zukunft eine Alternative zu den assistiert laparoskopischen Eingriffen am rechten Kolon darstellen.
    Notes: Abstract In combination with the biofragmentable Valtrac ring a newly developed purse-string suture clamp offers the possibility of performing intraperitoneal anastomoses of the small and large bowel without the need for stapling devices. During this experimental study endto-end anastomoses of the descending colon were constructed in five pigs. One animal was re-examined on day 1 after the operation and the others were all sacrificed on day 21 after. None of the animals showed any signs of an anastomotic leakage. Little scar tissue was seen macroscopically or histologically in the anastomotic region of the animals sacrificed 3 weeks after the operation. The operative technique presented in this paper might render the so-called assisted laparoscopic procedures for the right hemicolon unnecessary in the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00680117
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Maturation of binaural interaction components in auditory brainstem responses of young guinea pigs with monaural or binaural conductive hearing loss (1992)
    Springer
    European archives of oto-rhino-laryngology and head & neck 249 (1992), S. 325-328 
    Details
    ISSN: 1434-4726
    Keywords: Auditory maturation ; Binaural interaction components ; Auditory brainstem responses ; Conductive hearing loss ; Guinea pigs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Reversible conductive hearing loss created during the first 4 weeks post partum caused marked alterations in the maturation of binaural interaction components in the auditory brainstem responses of guinea pigs. In untreated control animals all three components investigated demonstrated postnatal development in terms of latency shortening that was completed during the first 3 weeks of life. Plugging of both external ear canals caused a significant delay in the maturation of the late component DN2, where latency values of the controls were reached only 2 weeks after the end of the treatment, i.e. after 6 weeks of life. Monaural deprivation likewise led to a retarded development of peak latencies during the phase of imbalanced sensory imput. After the end of the one-sided conductive hearing loss the maturation process was markedly enhanced, even resulting in latency values for DN2 and DP1 that were significantly shorter than those of the controls. This phenomenon persisted until the end of the study period and was the case for both plugged and untreated ears in this group of animals. The time course of latencies in two other groups of experimental animals which were deprived in the same way as adults suggests that the effects observed are due to a sensitive period in the maturation process of the auditory pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179382
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    Paper (German National Licenses)
    Fulltext
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