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Biomedical subjects

K Kochanek

Publications and source records attributed to K Kochanek.

At least 19 recordsLinked to original sources
PubMed1999

[Profound bilateral sensorineural hearing loss: a result of viral infections].

A patient is presented with profound bilateral sensorineural hearing loss, as a result of viral infections. The extensive clinical diagnosis was carried out. The findings of multiple audiological and immunological tests helped to fix the proper treatment and the period of its application. In consequence, the hearing in the right ear showed a significant improvement, but the left ear wasn't recovering. The inflammatory process occurred much earlier in the left ear and caused the indivertible hearing loss.

Acoustic Impedance Tests↗
PubMed1998

[Auditory brainstem responses in the diagnosis of retrocochlear hearing loss: selected case reports].

In this study, four cases of patients with retrocochlear hearing loss are presented (acoustic neuroma, cerebellopontine angle tumour, the fourth ventricle region tumour, inflammatory or vascular lesions in the fourth ventricle region). Standard audiometric tests, auditory brainstem response and radiological examinations such as CT scan and MRI were performed in all patients. The abnormal ABR observed in all cases suggested retrocochlear hearing loss. The presence of retrocochlear disorders was confirmed by CT or MRI. The analysis of presented cases showed that the abnormal ABR results should be a sufficient basis for referring the patient to MRI examination.

Adult↗
PubMed1997

[The auditory brainstem response recordings in small children at night].

Authors compare two methods of hearing assessment using ABR recordings in children at the age of 1 to 6 years. Following are the applied methods: 1) ABR recording in natural sleep at night and 2) ABR recording in pharmacologically induced sleep. Advantages and disadvantages of the methods are presented and parameters such as: time of examination, number of averages, number of artefacts and percentage of successful recordings have been evaluated.

Child↗
PubMed1996

[Computer analysis of nystagmus].

An algorithm for the computer analysis of nystagmus is described in this paper. This algorhythms was based on digital differentiator, which monitors the eye position. The computed eye velocity is next used as an input to the fast phase detector. Several procedures, including minimum velocity test, slope sense test, SPV and FPV relationship test are invoked to extract the fast phases from the recorded signal. Based on three-years experience (approx. 3000 examinations) using the ENG-PC System in clinical practice we can conclude, that application of the nystagmus detector was useful in most cases. In our opinion, despite from system imperfection which is observed during the analysis of recording disturbed by artifacts, this system has unquestionable advantage over the traditional technique.

Diagnosis, Computer-Assisted↗
PubMed1993

Time trends, cohort effects, and geographic patterns in stroke mortality--United States.

Trends and patterns in cerebrovascular disease mortality from 1940 to 1991 are examined using provisional and final mortality data from the US National Vital Statistics System. Trends are analyzed in terms of both period and cohort effects. Monthly data are examined using a time series regression model. Geographic patterns use maps ranking state mortality relative to the US average. Final 1989 data indicate that cerebrovascular disease remains the third leading cause of death in the United States, accounting for 145,551 deaths, or 6.8% of deaths from all causes. The age-adjusted death rate from stroke declined one-third during 1979 to 1989, more rapidly than the other ten leading causes of death. Overall, stroke mortality declined steadily from 1950 through the mid-1970s, then accelerated. On a cohort basis, each successive birth cohort since 1890 has improved their life-span experience from stroke deaths. Maps of stroke mortality demonstrate a persistent "stroke belt" in the South over the past decade.

Adult↗
PubMed1993

[First cochlear implant in Poland].

The authors present a 30 year old patient whose hearing was profoundly impaired in the course of meningitis 12 years ago. They present details on the preparation of the patient for the surgery and indications for the implant, consecutive stages of the surgery and the first stage of the rehabilitation process are described. The results of the capability of electrical conductivity of the cochlear nerve as the direct effect of the cochlear implant and the first audiogram illustrating the hearing effect after the first 2 months of rehabilitation are presented as well.

Adult↗
PubMed1993

Late subjective audiometric verifications of the early auditory brainstem responses results in young hard-of-hearing children before their speech development.

The authors described the late subjective audiometric verifications of the auditory brainstem responses (ABR) results in a group of hard-of-hearing children treated in Phoniatric Department of Children Hospital Dziekanów Leśny. The audiometric examinations took place after some time of the speech and hearing rehabilitation. The rehabilitation effects make the audiometric examinations feasible. The correlation between these two type of examinations was good.

Acoustic Stimulation↗
PubMed1992

Wplyw rodzaju bodzća dzẃiekowego na oznaczanie progu slichowego metoda ABR. [The effect of brief tone envelopes on ABR and behavioral thresholds].

The present study examines the effect of brief tone envelopes on ABR and behavioral thresholds in small groups of normal and hearing-impaired subjects. The hearing-impaired subjects had very steep high-frequency hearing loss in 2-6 kHz region. The stimuli for both ABR and behavioural estimates were 2 and 4 kHz tone burst with linear and nonlinear envelopes. Behavioural thresholds were estimated using a computer controlled, modified block up-down method. The ABR thresholds were evaluated from the recordings collected in automatic acquisition process. Results of our experiments showed that for different stimulus envelopes both behavioural and ABR thresholds were similar in normal range of hearing. However, for impaired ears at high frequencies, both psychoacoustic and ABR thresholds differ, sometimes quite significantly, depending on stimulus envelope.

Audiometry, Pure-Tone↗
PubMed1991

[Examination of reaction time--auditory brainstem responses--ABR in noise induced temporary and permanent threshold shift].

This study was conducted to investigate the differences between auditory brainstem responses--ABR recorded in men with temporary or permanent threshold shifts (TTS or PTS). Behaviorally, the tested ears showed insignificant differences in the hearing thresholds at frequencies in the range 0.25-8 kHz. The latency of waves I, III, V and interwave intervals I-III, III-V, I-V were analysed as functions of stimulus intensity. The comparisons between recordings obtained in groups with TTS and PTS showed significant differences in latencies of wave V at 90 dB nHl only. The latencies of waves I, III and interwave intervals were unaltered.

Adult↗
PubMed1988

[Evaluation of the effect of auditory fatigue on the human ear by auditory brain stem responses (ABR). I. Effect of auditory fatigue on temporary threshold shifts of ABR].

The effects of auditory fatigue on auditory brainstem responses (ABR) were investigated in 23 normal-hearing subjects. ABR was recorded before and after exposure to fatiguing noise. Behaviourally, the auditory fatigue was tested using a temporary threshold shifts (TTS) paradigm. The latency of waves I, III, V and interwave intervals I-III, III-V, I-V were analysed as functions of stimulus intensity. In post-exposure recordings a threshold elevation, significant increase of all waves latency, increase of interwave-interval III-V at 40,50,60 dB nHL and unaltered intervals I-III, I-V were observed.

Adult↗
PubMed1988

[Evaluation of the effect of auditory fatigue on the human ear based on the measurement of brain stem auditory potentials (ABR). II. Relation of temporary auditory threshold shift and changes in the latency of wave V].

The relationship between temporary threshold shift (TTS) and latency changes of auditory brainstem responses (ABR) induced by noise exposure was studied in 23 normal-hearing subjects. Shift in latency wave V at 40 dB nHL of stimulus intensity as a result of auditory fatigue showed no significant correlation with TTS at 4 kHz. The great intersubject variability of shifts in latency wave V as a result of auditory fatigue suggests that this shift may be a useful measure of individual susceptibility to noise.

Acoustic Stimulation↗
PubMed1983

Studies on the temporary effect of noise on the auditory function in man.

ECoG and ABR recordings were performed on 22 young, normal-hearing persons, before and after exposure to fatiguing noise. Temporary Threshold Shift (TTS) of up to 35 dB at 4-6 kHz was induced by octave band noise with centre frequency at 2.8 kHz. The latency of waves I, III, V and ACAP (Auditory Compound Action Potential) and intervals between waves I-III, III-V, I-V and ACAP-V were analysed as functions of stimulus intensity in pre- and post-exposure recordings. In post-exposure recordings a threshold elevation, a significant increase of latency and unaltered intervals between the successive waves and ACAP were observed. It was concluded that the noise-induced auditory fatigue, measured as TTS, originates within the cochlea and is transferred to the auditory pathways. The great intersubject variability of the data obtained indicates that the TTS may be a useful measure of individual sensitivity to noise, but prognosis on the presumed Permanent Threshold Shifts (PTS) based on the evaluation of TTS would seem doubtful.

Auditory Fatigue↗