Biomedical subjects

J D Clemis

Publications and source records attributed to J D Clemis.

64 records · Page 4Linked to original sources

PubMedDate not supplied

Clinical use of an insert earphone.

There are several applications of and advantages to using an insert earphone. An insert earphone has three parts: a transducer to convert electrical energy to sound, a conduit to deliver the sound into the ear canal, and a coupler connecting the device to the canal. The data from this study indicate that there is a distinct advantage in using insert earphones over TDH-49 phones (standard headphones) in the attenuation of low frequency ambient noise. The use of insert earphones will permit one to test hearing in areas of higher ambient noise than was previously possible. Insert earphones are used to shorten the hearing aid selection process. A technique is described in which only one real ear measurement is required for an accurate hearing aid fitting. Most, but not all, of the masking dilemmas that are encountered with standard headphones are circumvented or eliminated by using insert earphones. In brain stem auditory evoked response testing, the insert earphone reduces the stimulus artifact without influencing the acoustic signal. Finally, the insert earphone solves the collapsing ear canal problem.

Audiometry↗

PubMedDate not supplied

Monitoring of the glycerol test with sinusoidal harmonic acceleration in Menière's disease patients.

Changes in auditory pure tone threshold and speech discrimination and the phase and gain in the sinusoidal harmonic acceleration test were measured in subjects with endolymphatic hydrops (Meniere's disease) following the administration of glycerol. Although all subjects showed a marked improvement in auditory function, a comparable change in vestibular function, as measured by the sinusoidal harmonic acceleration test, was not observed.

Acceleration↗

PubMedDate not supplied

The approximation of audiometric thresholds by auditory brain stem responses.

Auditory brain stem response (ABR) thresholds for tone pip stimuli were compared with audiometric thresholds for 63 ears to assess the feasibility of deriving audiograms with ABR techniques. Correlations between the two measures were highly significant, indicating a high degree of accuracy in assessing degree and configuration of hearing loss with ABR. Patients with conductive losses showed a simple one-to-one relationship between ABR and audiometric thresholds, while patients with cochlear losses did not. Possibly this is due to the effects of abnormal temporal integration or poor frequency selectivity in this latter group.

Adolescent↗

PubMedDate not supplied

Neurogenic tumors of the skull base.

This review article summarizes the subject of neurolemmomas in and around the temporal bone and was written as a component paper for a symposium on surgery of the skull base. The paper primarily discusses solitary schwannomas of the facial nerve, vestibular schwannomas, and jugular foramen schwannomas relative to incidence, signs and symptoms, and preferential diagnostic and therapeutic options. General considerations such as multiple neurofibromatosis, current nomenclature, and malignancy are defined.

Adult↗

PubMedDate not supplied

Four unusual neoplasms of the nasopharynx.

Epidermoid carcinoma and angiofibroma are the commonly diagnosed lesions of the nasopharynx. Less common are unusual tumors of epithelial origin as well as those from endothelial and mesenchymal precursors. Otolaryngologists must be knowledgeable in the literature associated with these tumors to facilitate early diagnosis and to institute appropriate therapy. Cases of verrucous carcinoma, inverted papilloma, adenoid cystic carcinoma, and extramedullary plasmacytoma are presented. Current literature is reviewed and accepted modes of treatment are outlined.

Adult↗

PubMedDate not supplied

A jugular foramen schwannoma simulating an acoustic tumor with recovery of retrolabyrinthine cochleovestibular function.

Our literature review has tabulated 33 jugular foramen neuromas that appeared either as a neurologic "syndrome of the jugular foramen" like a glomas tumor, or similar to an acoustic tumor. The few posterior fossa tumors involving the eighth nerve or encroaching upon it that have been removed and resulted in cochleovestibular preservation or recovery have been reviewed. A rare case of jugular foramen schwannoma with cochleovestibular preservation after total removal has been extensively studied with preoperative and postoperative cochleovestibular tests.

Adult↗

PubMedDate not supplied