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At least 19 recordsLinked to original sources
PubMed1992

Temporal bone resections for carcinoma of the middle ear and the external ear canal.

Petrosectomy has been used in the management of carcinoma of the external ear canal and the middle ear for the last 45 years. In recent years, there have been conflicting reports; some authors advocate a conservative approach, whereas others support an ultraradical approach. Most retrospective studies report patients who have been treated with radiotherapy or surgery as having undergone the primary modality depending on where the patient first presented. No selection criteria seem to have been employed. Although radiotherapy was used postoperatively, the problems of wound healing were not addressed. This study presents our experience with temporal bone resection as described by Lewis and shows that, in combination with patient selection and proper choice of incision, reconstruction and timely postoperative radiotherapy can achieve better results, and the patient's quality of life can be preserved.

Combined Modality Therapy↗
PubMed1978

External ear injuries.

The unique shape of the external ear depends on the underlying cartilaginous framework. Injuries of the external ear are common. In dealing with lacerations, subperichondrial hematomas, perichondritis, burns and frostbite, particular care should be taken to maintain the cartilaginous framework and to prevent infection. In this way cosmetic deformities of the external ear can be prevented.

Burns↗
PubMed1976

The third crus of the anthelix and another minor anomaly of the external ear.

One minor anomaly of the external ear is a "third crus", which is an addition to the normal upper and lower crura at the anterior end of the anthelix. Another minor deformity is an extension of the crus of the helix, wherein it runs as a crest across the concha. An operation to correct the latter deformity is described.

Ear, External↗
PubMed1977

Pre-elastic (oxytalan) fibres in the developing elastic cartilage of the external ear of the rat.

During chondrogenesis in the external ear of the rat oxytalan fibres precede the appearance of mature elastic fibres by 6-7 days. The spatial distribution of oxytalan fibres in fetal and neonatal pre-cartilage corresponds to that of the elastic fibres in mature cartilage. These findings support the hypothesis that oxytalan fibres in the pre-cartilage of the external ear of the rat are pre-elastic in nature.

Age Factors↗
PubMed1977

Effect of systemic antibiotics on the microbial flora of the external ear canal in hospitalized children.

The effect of antibiotic therapy and hospitalization on the external ear canal flora was investigated in 131 children. Fifty-eight percent of the patients receiving antibiotic therapy had Gram-negative bacilli or yeasts in their external ear canal, compared with 17% of the patients who were hospitalized for ten days or longer and only 3% of the patients who were hospitalized for short periods. Antibiotic therapy is the major factor in determining the colonization rate of the external ear canal with potentially pathogenic flora. Children under 1 year of age seem to be the most susceptible group to this shift of flora.

Anti-Bacterial Agents↗
PubMed1977

Hereditary deafness associated with branchial fistulae and external ear malformations.

Two families are presented in which affected members had deafness, preauricular sinuses, branchial fistulae and malformation of the external ear. In Family I, a renal abnormality was an associated feature. In Family 2, two individuals had an abnormality of the incudostapedial joint. In both families inheritance was autosomal dominant with variable expressivity. The occurrence of external-ear malformations, branchial fistulae, and preauricular sinuses should indicate the need to search for a hearing loss not only in the patient but amongst relatives.

Abnormalities, Multiple↗
PubMed1992

External ear transfer function modeling: a beamforming approach.

In this article, a beamformer is proposed as a functional model for the spatial and temporal filtering characteristics of the external ear. The output of a beamformer is a weighted combination of the data received at an array of spatially distributed sensors. The beamformer weights and array geometry determine its spatial and temporal filtering characteristics. A procedure is described for choosing the weights to minimize the mean-squared error between the beamformer response and the measured response of the external ear. The effectiveness of the model is demonstrated by designing a beamformer of several hundred weights that duplicates and interpolates the measured external ear response of a cat over broad ranges of frequency and direction. A limited investigation of modeling performance as a function of array geometry is reported.

Animals↗
PubMed1992

Water used to visualize and remove hidden foreign bodies from the external ear canal.

Small foreign bodies lodged anteriorly in the tympanic sulcus are usually not visible, due to the curve of the external ear canal. Such objects can be seen with the aid of an otomicroscope and micromirror or with an endoscope, and removed by irrigation. If irrigation fails, epithelial migration on the tympanic membrane may remove lodged foreign bodies, although this may take months. Our new method, which uses water to locate small objects lodged in the tympanic sulcus, includes irrigation of the ear, adjustment of the water level to the middle curve of the external ear canal, and use of the water surface as a concave lens, making the tympanic sulcus visible. With otomicroscopy a curved ear probe can then be used to remove lodged foreign bodies from behind the curve.

Adult↗
PubMed1979

Aspects of the middle and external ear of early South African hominids.

A brief description of the exposed middle ear from two Swartkrans specimens demonstrates the feasibility of examining the inner auditory structures of existing fossil hominid material. These Swartkrans fossils provide the first clear view of the early hominid middle ear, and their structures appear to be morphologically distinct. The bony anatomy of the external ear of Australopithecus robustus is found to be unique among the South African hominids.

Animals↗
PubMed1992

Transmission of change in the atmospheric pressure of the external ear to the perilymph.

In experiments using guinea pigs, the middle ear and perilymphatic pressures were simultaneously registered in response to pressure change in the external ear canal. In the first experiment, pressure was slowly loaded in the ear canal in the range of 200 mm H2O to -200 mm H2O. Pressure transmission to the perilymph was smaller when the bulla was open to the outside than when it was closed. It was significantly impaired by disruption of the ossicular chain and especially by closure of the round window. The data indicate that air volume in the middle ear cavity plays an important role in transmission of slowly changing atmospheric pressures. In the second experiment, the eustachian tube was closed and the pressure was changed in the range of 1000 mm H2O to -1000 mm H2O. The middle ear and perilymphatic pressures increased or decreased corresponding to the loading pressure in the range of 400 mm H2O and -200 mm H2O. Beyond these levels, response rate of the middle ear pressure decreased and perilymphatic pressure declined in spite of further increase in loading pressure. The increase in pressure difference between the middle ear and the inner ear might cause disruption of the round and/or oval windows.

Animals↗
PubMed1992

Darier's disease of the external ear.

Darier's disease is a hereditary dermatological condition characterized by crusted papules distributed over the seborrhoeic areas of the trunk and head. A case of Darier's disease presenting to the Otolaryngology department because of severe involvement of the pinna is reported. The typical histological appearances are described and treatment discussed.

Darier Disease↗