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Effects of Perinatal Hypoxia on Frequency-Specific Auditory Brainstem Responses in the Chick

Effects of Perinatal Hypoxia on Frequency-Specific Auditory Brainstem Responses in the Chick


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About the Book

In previous human and animal studies, perinatal hypoxia has been shown to negatively affect the auditory brainstem response (ABR). The mechanisms of damage and sites of lesion in the auditory system resulting from hypoxia have been described therein. These previous studies used a non-frequency-specific click stimulus to evoke the ABR. The present study presents a simple animal model of prenatal hypoxia in the chick, and assesses the resulting frequency-specific ABRs. Hypoxia was induced in white leghorn chicks on embryonic day 17-18 either by an injection of saline into the large air-space of the egg or placement of the egg in an airtight plastic bag for 80-100 minutes. ABR thresholds, absolute latencies of the first two peaks, and interpeak latency intervals (IPIs) were recorded for tone-burst frequencies of 1, 2, and 4 kHz on post-hatch day 4 in the previously hypoxic chicks and in normal, control chicks. In addition, the basilar papillae of 4 randomly chosen hypoxic chicks were examined histologically. No significant differences in ABR thresholds were found between normal and hypoxic chicks at any frequency tested. Peak 1 latencies were significantly longer in the hypoxic group at all frequencies tested, and peak 2 latencies were significantly longer at 1 and 2 kHz only. IPIs were significantly higher in the hypoxic group at 1 kHz only. No obvious abnormalities were seen in the hair cells of the hypoxic chicks. This study demonstrates that prenatal hypoxia does not exert a frequency-specific effect on the ABR in chicks. Hypoxia does not seem to cause peripheral cochlear damage or a permanent increase in hearing thresholds. Hypoxia does seem to affect ABR latencies, suggesting that subtle permanent damage to auditory brainstem pathways occurs. This novel animal model of prenatal hypoxia may, in future research, help us understand the anatomical, physiological, and behavioral changes related to auditory processing after early hypoxic insult. Such future studies of mechanisms, critical periods, and possible methods of treating the effects of early hypoxia would likely have relevance to large numbers of human infants who experience similar insults to the detriment of their later auditory processing.


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Product Details
  • ISBN-13: 9781243611000
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 254 mm
  • Weight: 159 gr
  • ISBN-10: 1243611006
  • Publisher Date: 01 Sep 2011
  • Binding: Paperback
  • Spine Width: 5 mm
  • Width: 203 mm


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Effects of Perinatal Hypoxia on Frequency-Specific Auditory Brainstem Responses in the Chick
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Effects of Perinatal Hypoxia on Frequency-Specific Auditory Brainstem Responses in the Chick
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