PubMed Health⌕ Search

Biomedical subjects

G Flottorp

Publications and source records attributed to G Flottorp.

At least 19 recordsLinked to original sources
PubMed1992

Patient performance with two types of multiple electrode intracochlear implant.

The functional results of 9 persons implanted with the Symbion Ineraid and 8 persons implanted with the Nucleus cochlear implant with the F0, F1, F2 coding strategy are reported. All patients were postlingually totally deaf, the patients implanted with the Symbion Ineraid were all above 40 years of age, while the Nucleus patients were with one exception under 40 years of age. The CID Everyday Sentences Test, the Helen Test and the Speech Tracking Test showed that all patients improved their communication skills when sound through the implant was added to lip-reading. The patients' ability to understand without lip-reading was tested with the CID everyday sentences test, with the Helen test, with spondees, with three-choice vowels and with a consonant confusion test. These showed that all 9 Symbion Ineraid patients achieved some degree of open speech understanding. Four of the 8 Nucleus patients achieved some degree of open speech understanding. Difference limen tests for intensity and frequency indicated that 2 of the Nucleus patients who did not achieve open speech understanding probably had extensive cochlear nerve damage, while the remaining 2 Nucleus patients without open speech understanding had good frequency and intensity discrimination.

Acoustic Stimulation↗
PubMed1991

Personal cassette players ('Walkman'). Do they cause noise-induced hearing loss?

Playing selected types of music on five different personal cassette players (PCPs) and using different gain (volume) settings, A-weighted maximum and equivalent sound pressure levels (SPLs) were measured on KEMAR (Knowles Electronics Manikin for Acoustic Research). The octave band SPLs were measured on KEMAR ear and transformed to field values in order to compare measured values with the Norwegian noise risk criteria. Temporary threshold shifts (TTS) measured in 6 subjects after listening to two different pop music cassettes on one PCP in two separate sessions, are presented. Based upon these studies we conclude that the risk of acquiring permanent noise-induced hearing loss (NIHL) from use of PCP is very small for what we found to be normal listening conditions.

Acoustic Stimulation↗
PubMed1991

Treatment of noise induced hearing loss.

In most textbooks, it is stated that noise-induced hearing loss (NIHL) is an irreversible impairment of hearing. This is certainly true for the slowly, over time acquired NIHL. Working for years in a very noisy environment is causing a gradual killing of hair cells in the inner ear, with no hope for recovery. The other way of acquiring NIHL is by means of exposure to impact noise, and may cause various degree of impairment of the hair cell cilia, depending on the energy in the impulsive noise. If the cilia are completely broken, the chance for recovery is probably zero. In many instances, the result of exposure to impulsive noise, for instance from rifle shooting, may mainly be a disarrangement of the cilia. It will be shown an example of recovery from grade III NIHL to grade I after treatment of the exposed person with a stay in silence, i.e. in environmental noise below 70 dB(A), for three weeks.

Adult↗
PubMed1991

A study of the possibility of acquiring noise-induced hearing loss by the use of personal cassette players (walkman).

Playing various types of music on five selected personal cassette players (PCPs), A-weighted sound pressure levels (SPLs), together with octave band spectrum, were measured on KEMAR (Knowles Electronics Manikin for Acoustic Research). Maximum and equivalent SPLs were measured for various types of music, PCPs and for different gain (volume) settings. The measured SPL-values on KEMAR ear were transformed to field values outside the ear canal by means of corrections based on KEMAR's ear canal resonance curve--in order to compare measured values with the Norwegian national noise risk criteria. Temporary threshold shift (TTS) was measured after listening to PCP music for one hour in order to obtain additional information about possible risk of hearing damage. TTS values are presented for six subjects when playing two different pop music cassettes on one type PCP. Our analysis indicates that the risk for permanent noise-induced hearing loss from listening to PCP is very small for normal listening conditions.

Acoustic Stimulation↗
PubMed1983

Phytanic acid storage disease: hearing maintained after 15 years of dietary treatment.

Heredopathia atactica polyneuritiformis is a biochemically defined disease with a specific dietary treatment. It is an autosomal inborn error of metabolism. The phytanic acid is of exogenous origin and stems mainly from preformed phytanic acid in foods. In two Norwegian patients, serum phytanic acid has been brought down to normal levels and one of them has been followed for 15 years. During this period of dietary treatment there was no worsening of hearing.

Eicosanoic Acids↗
PubMed1982

Some pitfalls in the evaluation of auditory function after surgical procedures.

Because clinical bone conduction is composed of at least three different mechanisms, two of which are air conduction, uncritical use of the air-bone gap in connection with surgical procedures may give rise to erroneous conclusions. Genuine bone conduction may be influenced by ear pathology and by surgery due to alterations in the mechanical impedance at the site of application of the bone vibrator and at the round and oval windows. The supplementary use of impedance audiometry and advanced speech audiometry is recommended.

Acoustic Impedance Tests↗
PubMed1981

Acoustic brain stem response in diagnosis of acoustic neuroma.

The aim of the present investigation is to throw light upon the following question: Is recording of click-evoked brain stem responses (ABR) a more sensitive and reliable test than the oto-neurological and conventional audiological tests in selecting patients for computerized tomography (CT)? Thirty-three patients were examined. They all presented case histories and otoneurological findings indicating a tumor in te cerebellopontine angle. In all cases CT was carried out. A tumor was found in 16 patients, normal findings in 17. The results obtained by audiological and oto-neurological tests were compared to those obtained by ABR recording. It is concluded that recording of ABR and the caloric vestibular test are the most reliable examinations in selecting patients for CT. These examinations alone, are, however, not sufficient to secure a completely reliable selection, and should be supplemented by other audiological tests.

Adult↗