phones are officially prohibited. Standards for maximum peak acoustic power (120 dB) are based on advice edicted by the International Telegraph and Telephone Consultative Committee (ITTCC). This present regulation is strict and thereby the ‘Caisse Nationale suisse d’Assurance en cas d’accident’ (National Insurance Company for Accidents, CNA) has not been notified of any case of hearing loss resulting from the use of telephones during the last two decades. However, in the past few years, unofficial telephones have become available on the market, thus escaping control by the PTT.
We report two cases of hearing loss in individuals using these unofficial devices. In 1 patient the auditory insult resulted from the transmission of a loud, extraneous crack sound by a cord-type telephone: this is the first case report of trauma caused by a non-cordless telephone.
A healthy 56-year-old woman was referred to the ENT Department of the University Hospital of Geneva on October 28, 1986. She had been treated for 3
The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Case Study 51: Acoustic Trauma Caused by the Telephone: A Report of Two Cases ."
Environmental Medicine: Integrating a Missing Element into Medical Education . Washington, DC: The National Academies Press,
Please select a format: