John Ka Keung Sung

The Chinese University of Hong Kong, Hong Kong, Hong Kong

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Publications (3)2.52 Total impact

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    ABSTRACT: To establish the reliability and validity of a computerized self-administered hearing test. Cross-sectional within a comparative study of subjects. Subjects were 100 Chinese adults who attended the audiology clinic in a hospital for a hearing test. There was no significant difference in the thresholds of unmasked air-conduction hearing obtained with the computerized self-administered hearing test via a smartphone and those obtained with standard pure-tone audiometry. High test-retest reliability was observed with the self-administered hearing test (intraclass correlation coefficient = 0.95), and was comparable with that observed in standard pure-tone audiometry (intraclass correlation coefficient = 0.97). The thresholds of the self-administered hearing test measured in a sound-proof booth were not significantly different from those measured in a quiet office room. The results suggest that the computerized self-administered hearing test is a reliable and valid measure of unmasked air-conduction hearing thresholds.
    No preview · Article · Jun 2012 · International journal of audiology
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    ABSTRACT: To evaluate the safety and effectiveness of totally implantable hearing aid (Carina) was assessed in adult patients with bilateral moderate to severe hearing loss. Surgical implantations of Carina were performed in three adult patients with bilateral moderate to severe hearing loss. The safety and effectiveness were evaluated in a more than 12 months follow-up by comparison of outcomes of PTA and speech audiometry pre and post-operatively. The daily usage of implants was observed and compared with traditional hearing aids. The average elevation of unaided threshold elevation on surgical side was 8.3 dB postoperatively. The average functional gain in four speech frequencies of PTA was 35.4 dB HL and the average threshold decrease of speech discrimination was 22.5 dB HL. The subjective scoring of performance of the implants is significantly higher than traditional hearing aid. Totally implantable hearing aid (Carina) is an ideal implant to treat moderate to severe hearing loss. Long term follow-up is needed to validate the results.
    No preview · Article · Oct 2009 · Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery
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    ABSTRACT: To establish an olfactory test in the Hong Kong Chinese population. Prospective analysis of the results of a combined olfactory test (COT) for patients with olfactory dysfunction and for normal subjects attending a secondary and tertiary ear, nose and throat centre. Our COT was based on and modified from the Connecticut Chemosensory Research Centre test. It consisted of an odour identification test involving nine substances and a threshold test using a series of threefold dilutions of 1-butanol. From September 1998 to June 2002, 188 Hong Kong Chinese patients with olfactory dysfunction and subjects with normal olfaction were prospectively recruited. The subjects were categorized into normal, hyposmic and anosmic groups. The olfactory function of the main group of subjects (n = 153) was assessed with the COT by a blinded observer and also quantified with a visual analogue scale; the results were analysed to validate the discriminative ability of the COT. Another subgroup of subjects (n = 35) was tested with the COT twice with a two-week interval to evaluate test-retest reliability. There were 42 normal, 68 hyposmic and 43 anosmic subjects within the main group (total n = 153). The identification scores, threshold scores and combined olfactory scores were statistically significantly different between the anosmic, hyposmic and normal groups of subjects (p < 0.001). The combined olfactory score correlated with the visual analogue score and the correlation coefficient was 0.56 (p < 0.01). The mean time spent on each COT was 8.6 minutes (standard deviation = 3.4 minutes). The test-retest reliability of the COT was satisfactory, with a one-way model intraclass correlation coefficient of 0.87 (n = 35). The satisfactory discriminative ability and test-retest reliability of the COT have been demonstrated in this study. The COT is a feasible method for assessing sense of smell in the Hong Kong Chinese population.
    No preview · Article · Mar 2006 · The Journal of Laryngology & Otology