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Biomedical subjects

K C Webb

Publications and source records attributed to K C Webb.

3 recordsLinked to original sources

Newborn hearing screening using the Crib-O-Gram.

The purpose of this investigation was to identify variables that might affect the failure rate and test duration of Crib-O-Gram hearing screenings. One hundred sixty-three infants who graduated from a neonatal intensive care unit were screened. All screenings were performed by nurses in the open nursery. For the purposes of statistical analyses the infants were divided into three groups: group A--passed the first screening; group B--failed the first screening and passed the second screening; and group C--failed both screenings. The length of Crib-O-Gram screening and screening outcome were not associated with gestational age, conceptional age, weight, or time at which the test commenced. Infants who failed the screening twice had shorter screening durations than infants who passed the screening the first time.

Audiometry↗

Evaluation of a new tape recording of the synthetic sentence identification test.

The purpose of this study was to collect normative data on a commercially available tape recording of the Synthetic Sentence Identification test with ipsilateral competing message. Twenty normal-hearing subjects with no history of central auditory dysfunction were used. Mean percentage of intelligibility scores and standard deviations were obtained at various message-competition ratios. Results were compared to previous research. The data obtained using this recording can now be used as a reference for making clinical judgments.

Adult↗

Bone-conduction masking for threshold assessment in auditory brain stem response testing.

The viability of applying Sensorineural Acuity Level (SAL) audiometry to auditory brain stem response (ABR) testing was investigated using 38 subjects with normal hearing, conductive, sensorineural, and mixed hearing losses. The stimuli were clicks, 4000, 2000, and 1000 Hz tone-pips. After ABR thresholds (ABRt) were obtained, bone-conducted noise was used to mask the response to a stimulus 5 dB above ABR threshold (ABRt + 5). Estimates of behavioral bone-conduction thresholds were made by observing the amount of noise needed to mask ABRt + 5. Estimates of behavioral air-conduction thresholds were based upon ABRt. Results indicated that ABRt was within +/- 10 dB of behavioral air-conduction threshold across subject groups at least 74% of the time for all tone-pip stimuli. ABRt was within +/- 15 dB of the pure-tone average of 1000, 2000, and 4000 Hz 75% of the time when click stimuli were used. Derived bone-conduction thresholds were within +/- 10 dB of the actual bone-conduction threshold at least 73% of the time for all stimuli. It was concluded that, when used in a conservative manner, the application of SAL audiometry to ABR testing may increase the reliability and confidence with which decisions are made concerning the type and degree of hearing loss in difficult-to-test patients.

Adult↗