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Biomedical subjects

R J Keim

Publications and source records attributed to R J Keim.

23 records · Page 2Linked to original sources
PubMedDate not supplied

Cordless telephones: a threat to hearing.

Several patients with documented permanent sensorineural hearing losses secondary to the use of cordless telephones have been evaluated. In the interests of saving space and weight, these units have the ear receiver double as the ringing or bell device. The output of the bell on all of the units we have tested to date has been in the 140-dB range on the A scale. In each instance, the patient held the telephone against the ear when ringing occurred, and in three instances a loud extraneous crack was transmitted. Unlike regular cord-type telephones, these devices have no automatic gain control in the receiver circuit.

Adult↗
PubMedDate not supplied

Thermal hazards in mastoid surgery: an evaluation of instruments and irrigation techniques.

Study of the mechanical properties of three commonly used mastoid drills disclosed major differences in their power and potential for heat production. Based on available information regarding heat tolerance of neural tissue, all drills were found capable of producing hazardous temperature elevations. After testing several irrigation techniques, continuous and copious suction irrigation was found to be most effective in preventing bone heating.

Biomechanical Phenomena↗
PubMedDate not supplied

Detection of middle ear disease in cleft-palate patients.

A prospective study of 17 cleft-palate patients under the age of 37 months was performed. The otoscopic findings, as reported by the primary physician and otolaryngologist, were compared with the results of tympanometry. Preoperatively, all tympanograms were abnormal. Ears with an AS pattern were not described as abnormal by any physician, and postoperatively, these ears all progresses to a more advanced stage of disease.

Acoustic Impedance Tests↗
PubMedDate not supplied

Malignant change of laryngeal papillomas: a case report.

A major controversy surrounding juvenile papilloma is whether or not these lesions ever spontaneously undergo malignant change. One view contends that malignant change never takes place unless the lesion is irradiated. Presented is a 22-year-old man who suddenly develops features of extensive malignant invasion of his neck and mediastinum but has no history of irradiation.

Adult↗