This study was performed to assess whether there is an association between elevated Fasting Blood Glucose(FBG) and hearing impairment in Bangladeshi population. A total of 142 subjects(72 with elevated FBG; 70 control...This study was performed to assess whether there is an association between elevated Fasting Blood Glucose(FBG) and hearing impairment in Bangladeshi population. A total of 142 subjects(72 with elevated FBG; 70 control) were included in the study. The mean auditory thresholds of the control subjects at 1,4,8 and 12 kHz frequencies were 6.35 ± 0.35,10.07 ± 0.91,27.57 ± 1.82, 51.28 ± 3.01 dB SPL(decibel sound pressure level), respectively and that of the subjects with elevated FBG were 8.33 ± 0.66,14.37 ± 1.14, 38.96 土 2.23, and 71.11 ± 2.96 dB.respectively. The auditory thresholds of the subjects with elevated FBG were significantly(p < 0.05) higher than the control subjects at all the above frequencies, although hearing impairment was most evidently observed at an extra-high(12 kHz) frequency. Subjects with a long duration of diabetes(>10 years) showed significantly(p < 0.05) higher level of auditory thresholds at 8 and 12 kHz, but not at 1 and 4 kHz frequencies,compared to subjects with shorter duration of diabetes(≤10 years). In addition, based on the data of odds ratio, more acute impairment of hearing at the extra-high frequency was observed in diabetic subjects of both older(>40 years) and younger(<40 years) age groups compared to the respective controls. The binary logistic regression analysis showed a 5.79-fold increase in the odds of extra-high frequency hearing impairment in diabetic subjects after adjustment for age, gender and BMI. This study provides conclusive evidence that auditory threshold at an extra-high frequency could be a sensitive marker for hearing impairment in diabetic subjects.展开更多
Objective To detect early signs of noise-induced hearing loss(NIHL) in military pilots without hearing complaints. Methods Pure tone audiometry and acoustic reflex thresholds were tested in 36 military pilots (72 ears...Objective To detect early signs of noise-induced hearing loss(NIHL) in military pilots without hearing complaints. Methods Pure tone audiometry and acoustic reflex thresholds were tested in 36 military pilots (72 ears) with noise exposure history but no complaints of hearing loss. Conventional test frequencies (0.25-8 kHz) and extended high frequencies (EHF, 10 and 12.5 kHz) were included in audiometry. White noise and pure tones at 0.5, 1, 2, and 4 kHz were used for acoustic reflex tests. Twenty normal hearing subjects(40 ears) with no exposure to occupational noise were used as controls. Results Pure tone thresholds at all conventional frequencies and at EHFs were elevated in the pilots, with the maximum shift at 4 kHz, compared with controls (p < 0.01). The pilots also showed elevated ART to white noise and decreased differentials between white noise and pure tone ARTs (p< 0.01). Conclusion Early signs of NIHL are present in some symptom-free military pilots. High frequency hearing threshold shift, elevated white noise ART and decreased differential between white noise and pure tone ARTs may be objective indicators of early NIHL.展开更多
文摘This study was performed to assess whether there is an association between elevated Fasting Blood Glucose(FBG) and hearing impairment in Bangladeshi population. A total of 142 subjects(72 with elevated FBG; 70 control) were included in the study. The mean auditory thresholds of the control subjects at 1,4,8 and 12 kHz frequencies were 6.35 ± 0.35,10.07 ± 0.91,27.57 ± 1.82, 51.28 ± 3.01 dB SPL(decibel sound pressure level), respectively and that of the subjects with elevated FBG were 8.33 ± 0.66,14.37 ± 1.14, 38.96 土 2.23, and 71.11 ± 2.96 dB.respectively. The auditory thresholds of the subjects with elevated FBG were significantly(p < 0.05) higher than the control subjects at all the above frequencies, although hearing impairment was most evidently observed at an extra-high(12 kHz) frequency. Subjects with a long duration of diabetes(>10 years) showed significantly(p < 0.05) higher level of auditory thresholds at 8 and 12 kHz, but not at 1 and 4 kHz frequencies,compared to subjects with shorter duration of diabetes(≤10 years). In addition, based on the data of odds ratio, more acute impairment of hearing at the extra-high frequency was observed in diabetic subjects of both older(>40 years) and younger(<40 years) age groups compared to the respective controls. The binary logistic regression analysis showed a 5.79-fold increase in the odds of extra-high frequency hearing impairment in diabetic subjects after adjustment for age, gender and BMI. This study provides conclusive evidence that auditory threshold at an extra-high frequency could be a sensitive marker for hearing impairment in diabetic subjects.
文摘Objective To detect early signs of noise-induced hearing loss(NIHL) in military pilots without hearing complaints. Methods Pure tone audiometry and acoustic reflex thresholds were tested in 36 military pilots (72 ears) with noise exposure history but no complaints of hearing loss. Conventional test frequencies (0.25-8 kHz) and extended high frequencies (EHF, 10 and 12.5 kHz) were included in audiometry. White noise and pure tones at 0.5, 1, 2, and 4 kHz were used for acoustic reflex tests. Twenty normal hearing subjects(40 ears) with no exposure to occupational noise were used as controls. Results Pure tone thresholds at all conventional frequencies and at EHFs were elevated in the pilots, with the maximum shift at 4 kHz, compared with controls (p < 0.01). The pilots also showed elevated ART to white noise and decreased differentials between white noise and pure tone ARTs (p< 0.01). Conclusion Early signs of NIHL are present in some symptom-free military pilots. High frequency hearing threshold shift, elevated white noise ART and decreased differential between white noise and pure tone ARTs may be objective indicators of early NIHL.
