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Biomedical subjects

N T Hopkinson

Publications and source records attributed to N T Hopkinson.

7 recordsLinked to original sources
PubMedDate not supplied

Present audiologic status of subjects implanted with auditory prostheses.

Audiological testing indicated that all of the subjects had profound sensorineural hearing losses. In 12 of the 13 subjects, this profound hearing loss was bilateral. The 13th subject, however, had useable hearing in his unimplanted ear. Tympanometric testing gave no evidence that implant surgery had disrupted middle ear function.

Audiometry↗
PubMedDate not supplied

Hearing performance with the auditory prosthesis.

With their prostheses activated 12 of 13 subjects were able to respond to sound (bands of noise) at intensities (35-65 dB SPL) that typically arise in the normal acoustic environment. While this "hearing" did allow them to be aware of speech, it did not permit them to understand speech. On the other hand, this "hearing" does seem to help them with identification of common environmental sounds and with lipreading, within the context that those abilities were tested here.

Audiometry↗
PubMedDate not supplied

Preschool otologic and audiologic screening.

A study of otologic and audiologic screening of preschool children including tympanometry, acoustic reflexes, and pure-tone screening was carried out at school sites. Subsequent pure-tone threshold tests and otolaryngologic examinations were carried out in a hospital setting. Complete data are available on 1,335 subjects, ages 3 through 5 years. Results are reported in comparison with those of an earlier Pittsburgh screening study. The results of the earlier study showed that loss of hearing sensitivity could not be predicted by the otologic findings, and conversely, the otologic findings could not be predicted by the air conduction thresholds. The results of the present study showed a contribution by tympanometry and acoustic reflexes. The results are evaluated in terms of screening effectiveness in these age groups. One of the recommendations combines an interpretation of certain large negative tympanometric peak pressures (TPP) along with the absence of acoustic reflexes to certain stimuli. The method is more efficient than other aspects of middle ear measurement or of pure-tone screeniing. The efficiency of each procedure is documented. Summary matrices are used to show the effectiveness of each test compared to all other tests in the identification of subjects with hearing or middle ear dysfunction. A protocol for screening evaluation and otologic referral is suggested to effect a balance between over-referral and correct identification.

Acoustic Impedance Tests↗
PubMedDate not supplied

A comparison of results--acoustic susceptance and otolaryngology.

A screening study of hearing and middle-ear function was conducted on 2125 preschool children. Results are reported here for 504 of the subjects with static acoustic susceptance. Of these children, 380 had otolaryngological examinations. Static acoustic susceptance reliably provides an estimate of the stiffness component of the middle ear, but it does not predict middle ear abnormalities consistently. Three-year-old female subjects seem to show low values of static acoustic susceptance associated more with developmental factors than with middle ear disease.

Acoustic Impedance Tests↗