Biomedical subjects

R Laszig

Publications and source records attributed to R Laszig.

114 records · Page 7Linked to original sources

PubMed1986

[High-resolution computerized tomography as a supplementary examination prior to cochlear implants].

Patients must be thoroughly tested for their suitability for a cochlear implant. Promontory testing and electrocochleography are of fundamental importance. It is possible to distinguish sensory deafness from other forms by combining the results of both tests. The implantation of intracochlear electrodes requires exact information of the anatomy of the cochlea, the tympanic wall of the cochlea and the endocochlear space. This can be assessed by axial high resolution computed tomographic scans. 8 of 70 patients were inoperable because of cochlea lesions (fractures or malformations). The advantage of computer tomography compared to conventional tomography is the fact that radiation exposure is less while the resolution is nearly the same. If computer tomography and conventional tomography do not reveal any fractures an exploratory tympanotomy should precede the cochlear implant operation in patients with a history of cranio-cerebral trauma.

Audiometry, Evoked Response↗

PubMed1986

[Acute unilateral deafness caused by mumps--a case description].

Reports of the aetiology of mumps induced deafness in the auditory pathway have not appeared in the literature in recent years. It is now possible to distinguish between sensory deafness and other types of profound hearing loss by combining the results of promontory testing (PT) and electrocochleography (ECochG). A very extensive examination of a case of profound sudden hearing loss due to mumps is described. It was impossible to prove a relation between the mumps virus and sudden hearing loss in this case but the site of the lesion in the auditory pathway could be localised. The hearing loss in this case was of sensory type, profound, irreversible and resistant to treatment.

Audiometry, Evoked Response↗

PubMed1985

[Development of pressure in the middle ear after nasal operations].

The middle ear pressure was determined by tympanometry on 46 patients (92 middle ears) before and after rhinoplasty. Abnormal tympanograms and pathological negative pressure in the middle ear space was found in about a quarter of all cases. In the first two days after the operation a high negative pressure developed in about 70%. The negative pressure was equalized after the packing was removed and 5 days after the rhinoplasty we found normal middle ear pressure in 94% of patients. Reasons for development of negative intratympanic pressure are discussed. The conclusion from our investigation is that tympanoplasty and rhinoplasty surgery should not be performed on the same day.

Acoustic Impedance Tests↗

PubMed1984

[Diagnosis and therapy of seromucous otitis. Experience with 2766 operations on children].

We compared tympanometric patterns with the type of ear effusion on 1693 ears of children with chronic seromucous otitis. There was no exact agreement between the tympanograms and the viscosity of the middle ear effusion. We inserted ventilating tubes in 943 of 2766 ears with SOM. A tube was only used if there was mucus in the middle ear. In cases of thin fluid we used myringotomy alone. A test to find the best tube is discussed. For a child with SOM the insertion of a ventilation tube is so helpful and complications so rare that in our opinion there is no better way of treatment. The complications are probably related more to the underlying disease than to the ventilation tube.

Acoustic Impedance Tests↗

PubMed1983

[The intratympanic pressure ratio modified by nitrous oxide and dependent upon retrotympanic volume].

We measured the middle ear pressure of patients with intact middle ear during general anaesthesia with Halothane and N2O. The Madsen-Impedance-Measuring-Instrument ZO 73 was used. The planimetric size of the mastoid bone cavity was determined on radiograms in Schüller projection. The pressure in the middle ear space was found dependent from the size of the mastoid bone. The height of the middle ear pressure during tympanoplasty is not without problems, this will be discussed, and the advantages of local-anesthesia will be pointed out as well.

Acoustic Impedance Tests↗

PubMed1982

[Intratympanic pressure changes during general anaesthesia (author's transl)].

A common observation during otologic surgery under general anaesthesia, notably with nitrous oxide, is tympanic membrane graft displacement due to elevated intratympanic pressure. It can be assumed that nitrous oxide increases the intratympanic pressure. The authors measured the intratympanic pressure changes with the Madsen Impedance measuring instrument Z073. The results of the measurements of 84 ears are discussed and the tendencies of the connection between pressure in the middle ear and the size of the mastoid bone are shown.

Acoustic Impedance Tests↗