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Biomedical subjects

N P Redfield

Publications and source records attributed to N P Redfield.

5 recordsLinked to original sources

Treatment of negative middle ear pressure and serous otitis media with Politzer's technique. An old procedure revisited.

This study sought to monitor changes in middle ear pressure with tympanometry after a simplified home politzerization maneuver in children who had excessive negative intratympanic pressure and/or serous otitis media. The mean middle ear pressure for 23 children was -201 mm H2O, whereas seven subjects displayed a flat tympanogram that was consistent with the medical diagnosis of serous otitis media. Middle ear pressure measurements with tympanometry at five and ten minutes after politzerization indicated successful tympanic ventilation in 91% and 85% of the ears, respectively. For children with negative intratympanic pressures of -250 mm H2O, data suggested that ventilation was sustained for at least 30 minutes. In general, results lend support for using home politzerization as an alternative or associative treatment in children with high negative pressure and/or serous otitis media.

Acoustic Impedance Tests↗

Audiometric, impedance, and otoscopic findings in children with cleft palates.

We examined the prevalence of hearing loss and/or middle ear disease among 34 children with cleft palates, using pure-tone audiometry, acoustic impedance, and pneumatic otoscopy. The overall incidence of hearing loss and otitic complications varied from 57% to 68%, depending on the procedure used. Of the three clinical procedures used in this study, pure-tone audiometry exhibited the poorest diagnostic efficiency. Close predictive agreement was found between impedance and otoscopy.

Adolescent↗

Evaluation of automatic screening tympanometry in the identification of middle ear pathology.

This study was designed to evaluate the diagnostic sensitivity of a prototype tympanometric screening instrument. Results from automatic tympanometry and complete electroacoustic impedance measurements (tympanometry, static compliance, and acoustic reflex thresholds) were compared to otologic diagnosis in 53 ears with middle ear pathology. Results suggested a high percentage of agreement between screening tympanometry, results from a complete impedance test battery and pneumatic otoscopy. These findings lend support for theuse of screening tympanometry in school hearing-screening programs and in pediatric practice.

Adolescent↗