Auditory Brainstem Responses from Graduates of an Intensive Care Nursery Normal Patterns of Response Research Article
Research Article  |   September 01, 1987
Auditory Brainstem Responses from Graduates of an Intensive Care Nursery
 
Author Affiliations & Notes
  • Michael P. Gorga
    The Boys Town National Institute, Omaha, NE
  • Jan K. Reiland
    The Boys Town National Institute, Omaha, NE
  • Kathryn A. Beauchaine
    The Boys Town National Institute, Omaha, NE
  • Don W. Worthington
    The Boys Town National Institute, Omaha, NE
  • Walt Jesteadt
    The Boys Town National Institute, Omaha, NE
Article Information
Research Articles
Research Article   |   September 01, 1987
Auditory Brainstem Responses from Graduates of an Intensive Care Nursery
Journal of Speech, Language, and Hearing Research, September 1987, Vol. 30, 311-318. doi:10.1044/jshr.3003.311
History: Received October 10, 1986 , Accepted December 30, 1986
 
Journal of Speech, Language, and Hearing Research, September 1987, Vol. 30, 311-318. doi:10.1044/jshr.3003.311
History: Received October 10, 1986; Accepted December 30, 1986

Auditory brainstem responses (ABR) were obtained from graduates of an intensive care nursery (ICN) when those babies were in stable physiological states and ready for hospital discharge. Intensity ranged from ABR threshold to 80 dB nHL, and all recordings were made in a sound-isolated chamber. The data reviewed here are from 585 babies having presumably normal hearing, based upon bilateral ABR thresholds of 30 dB nHL or less. To insure that estimates of population statistics were not biased by high correlations between ears, only the data from the left ears were used in most analyses. Larger correlations were observed between conceptional age (CA) and ABR latencies than between either gestational age (GA) or chronological age (CHA) and the same latencies. Data were grouped into six CA groups for further analyses. Distributions of all response-component latencies were similar in shape and depended upon CA, showing orderly decreases in latency with increasing age. None of these distributions differed significantly from normal, and they were well fitted by normal ogives. Thus, accurate estimates of percentiles can be obtained from the means and standard deviations. The results indicate that it is important to take CA into account when evaluating ABR latencies.

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