Correlation of numeric rating scale with pure tone audiogram for assessing hearing loss.

Objective: Hearing loss is the public health problem affecting all the age groups. For the assessment of hearing loss pure tone audiogram (PTA) is the gold standard but cannot be easily available in rural areas. So, the main aim of our study is to see the correlation of numeric rating scale with the pure tone audiogram for assessing the hearing loss. Materials and methods: This was the prospective, non randomized and longitudinal study performed in two hundred patients with unilateral hearing loss. For the study purpose, the numeric rating scale (NRS) was divided into 5 parts as that of degree of hearing loss and the PTAwas also divided into 5 parts to see the correlation with the NRS findings. The analysis was done using SPSS 16.0 Software. Results: The total frequency of unilateral hearing loss was 1.79%. 125(62.5%) patients fell within 16 – 25years.The mean age was 23.2+/-9.7.Females were affected more than males. Most of the patients who were in high school had unilateral hearing loss. Students and housewives accounted for 87.5%. 89% patients had conductive hearing loss, 10% had sensorineural hearing loss whereas only 1% patients had mixed hearing loss. The most of patients reported NRS2 and NRS3 which was 85.5%. Regarding the PTA analysis, 91% patients fell within mild and moderate hearing loss. There was high degree of correspondence in mild hearing loss between NRS and PTA. The Pearson’s correlation showed the statistically significant correlation between NRS and PTA with p=0.00 Conclusion: The NRS scale can be used as an optional measure for PTAin assessing the hearing loss mainly in rural areas for screening where there is lack of PTA.

Comparison of pre and post-operative hearing results in canal wall down mastoidectomy with type III tympanoplasty.

This study was done to compare the pre and post-operative hearing results in patients undergoing canal wall down mastoidectomy with classical type III tympanoplasty using temporalis fascia alone. Patients of >or=5 years age with the diagnosis of Chronic otitis media (squamous) with conductive or mixed hearing loss, needing canal wall down mastoidectomy and with intact and mobile stapes suprastructure at surgery who underwent classical type III tympanoplasty were included in the study. The pre and post-operative PTA was performed and evaluated. The post-operative hearing was assessed in terms of average ABG and size of ABG closure. Mean pre and post-operative air bone gap in classical type III tympanoplasty were 37.8 dB and 29.8 dB respectively and these differences were statistically significant. The postoperative PTA-ABG ranged from 15-61.2 dB. Hearing results after type III tympanoplasty varied widely showing statistically significant improvement in mean post-operative PTA-ABG but there was a great variation.