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Displaying publications 41 - 46 of 46 in total

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Fulltext Acoustic neuroma with orofacial paresthesia: description of an atypical presentation

Lim CC, Misron K, Liew YT, Wong EHC

BMJ Case Rep, 2019 Nov 04;12(11).
PMID: 31690691 DOI: 10.1136/bcr-2019-232275

Acoustic neuroma (AN) usually manifests with asymmetric hearing loss, tinnitus, dizziness and sense of disequilibrium. About 10% of patients complain of atypical symptoms, which include facial numbness or pain and sudden onset of hearing loss. Patients with atypical symptoms also tend to have larger tumours due to the delay in investigation. We report a particularly interesting case of a patient presented to us with numbness over her right hemifacial region after a dental procedure without significant acoustic and vestibular symptoms. Physical examination and pure tone audiometry revealed no significant findings but further imaging revealed a cerebellopontine angle mass. The changing trends with easier access to further imaging indicate that the presentation of patients with AN are also changing. Atypical symptoms which are persistent should raise clinical suspicion of this pathology among clinicians.

Matched MeSH terms: Audiometry, Pure-Tone
Fulltext A review of the management of 107 dizzy patients at the university hospital

Krishnan G

Med J Malaysia, 1994 Mar;49(1):44-8.
PMID: 8057990

The common investigations done were pure tone audiometry, electronystagmography, X-ray of the internal auditory meatus, CT-scan of the internal auditory meatus and X-ray of the cervical spine. After the examinations and investigations only 52 patients out of the 107 could be given any diagnosis. The most common diagnosis for the vertigo was Meniere's disease.

Matched MeSH terms: Audiometry, Pure-Tone
A Preliminary Study Investigating the Association Between Hearing Acuity and a Screening Cognitive Tool

Mukari SZS, Ishak WS, Maamor N, Wan Hashim WF

Ann Otol Rhinol Laryngol, 2017 Oct;126(10):697-705.
PMID: 28845678 DOI: 10.1177/0003489417727547

OBJECTIVES: Studies in cognitive aging demonstrated inconsistent association between hearing and cognition in older adults. Furthermore, it is still unclear if hearing loss at high frequencies, which is the earliest to be affected, is associated with cognitive functioning. This study aimed to determine the association between global cognitive status and pure tone average (PTA) at 0.5, 1, and 2 kHz (PTA low) and PTA at 4 and 8 kHz (PTA high).
METHODS: This study involved 307 adults aged 60 years and older. Participants had their hearing and cognition measured using pure tone audiometry and Mini Mental State Examination (MMSE), respectively.
RESULTS: Pure tone average (low) accounted for significant but minimal amount of variance in measure of MMSE. Multiple regression analyses were also performed on normal and impaired hearing cohorts and cohorts with younger (60-69 years) and older (≥70 years) groups. The results revealed a significant relationship between PTA (low) and MMSE only in the younger age group. In contrast, no significant relationship was found between PTA (high) and cognition in any of the cohorts.
CONCLUSION: Pure tone average (low) is significantly but minimally related to measure of general cognitive status. Similar relationship is not observed between high-frequency hearing and cognition. Further research using a more comprehensive cognitive test battery is needed to confirm the lack of association between high-frequency hearing and cognition.

Matched MeSH terms: Audiometry, Pure-Tone*
Fulltext A Novel Approach for Classifying Native Chinese and Malay Speaking Persons According to Cortical Auditory Evoked Responses

Ibrahim IA, Ting HN, Moghavvemi M

J Int Adv Otol, 2019 Apr;15(1):87-93.
PMID: 30924771 DOI: 10.5152/iao.2019.4553

OBJECTIVES: This study uses a new approach for classifying the human ethnicity according to the auditory brain responses (electroencephalography [EEG] signals) with a high level of accuracy. Moreover, the study presents three different algorithms used to classify the human ethnicity using auditory brain responses. The algorithms were tested on Malays and Chinese as a case study.
MATERIALS AND METHODS: The EEG signal was used as a brain response signal, which was evoked by two auditory stimuli (Tones and Consonant Vowels stimulus). The study was carried out on Malaysians (Malay and Chinese) with normal hearing and with hearing loss. A ranking process for the subjects' EEG data and the nonlinear features was used to obtain the maximum classification accuracy.
RESULTS: The study formulated the classification of Normal Hearing Ethnicity Index and Sensorineural Hearing Loss Ethnicity Index. These indices classified the human ethnicity according to brain auditory responses by using numerical values of response signal features. Three classification algorithms were used to verify the human ethnicity. Support Vector Machine (SVM) classified the human ethnicity with an accuracy of 90% in the cases of normal hearing and sensorineural hearing loss (SNHL); the SVM classified with an accuracy of 84%.
CONCLUSION: The classification indices categorized or separated the human ethnicity in both hearing cases of normal hearing and SNHL with high accuracy. The SVM classifier provided a good accuracy in the classification of the auditory brain responses. The proposed indices might constitute valuable tools for the classification of the brain responses according to the human ethnicity.

Matched MeSH terms: Audiometry, Pure-Tone/methods
3 Tesla magnetic resonance imaging noise in standard head and neck sequence does not cause temporary threshold shift in high frequency

Lim EY, Tang IP, Peyman M, Ramli N, Narayanan P, Rajagopalan R

Eur Arch Otorhinolaryngol, 2015 Nov;272(11):3109-13.
PMID: 25205300 DOI: 10.1007/s00405-014-3232-y

High acoustic noise level is one of the unavoidable side effects of 3 T magnetic resonance imaging (MRI). A case of hearing loss after 3 T MRI has been reported in this institution and hence this study. The objective of this study was to determine whether temporary threshold shift (TTS) in high frequency hearing occurs in patients undergoing 3 T MRI scans of the head and neck. A total of 35 patients undergoing head and neck 3 T MRI for various clinical indications were tested with pure tone audiometry in different frequencies including high frequencies, before and after the MRI scan. Any threshold change from the recorded baseline of 10 dB was considered significant. All patients were fitted with foamed 3 M earplugs before the procedure following the safety guidelines for 3 T MRI. The mean time for MRI procedure was 1,672 s (range 1,040-2,810). The noise dose received by each patient amounted to an average of 3,906.29% (1,415-9,170%). The noise dose was derived from a normograph used by Occupational Noise Surveys. This was calculated using the nomograph of L eq, L EX, noise dose and time. There was no statistically significant difference between the hearing threshold before and after the MRI procedures for all the frequencies (paired t test, P > 0.05). For patients using 3 M foamed earplugs, noise level generated by 3 T MRI during routine clinical sequence did not cause any TTS in high frequency hearing.

Matched MeSH terms: Audiometry, Pure-Tone
Fulltext "High frequency presbycusis"-is there an earlier onset?

Arvin B, Prepageran N, Raman R

Indian J Otolaryngol Head Neck Surg, 2013 Dec;65(Suppl 3):480-4.
PMID: 24427701 DOI: 10.1007/s12070-011-0356-x

The objective of this study is to determine whether presbycusis occurs much earlier than previously believed if the high frequency (above 8 kHz) are included. Tertiary referral center (a teaching University). This is a cross-sectional observational study. Healthy adults from 20 to 49 years of age who had essentially normal hearing were included into the study. They were subjected to high frequency pure tone audiometry (until 16 kHz). Participants were grouped based on age ranges of 10 years (e.g., 20-29, 30-39, and 40-49) and the presence of symmetrical high frequency sensor neural hearing loss were documented. There is a significant presence of symmetrical high frequency sensor neural hearing loss (not attributed to any known risk factors) as early as from the age group of 40 to 49 years. Seven of 43 participants (16%) from age group of 20 to 29 years and 12 of 24 participants (50%) from age group of 30 to 39 years had significant high frequency hearing loss. High frequency hearing loss (high frequency Presbycusis) may occur much earlier than previously believed.

Matched MeSH terms: Audiometry, Pure-Tone