efeitos da radiação acústica na obtenção dos limiares ósseos acoustic radiation effects on bone conduction threshold measurement
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Abstract
Acoustic radiation is the sound energy escape from a bone vibrator that may be detected by air conduction mechanisms. The presence of acoustic radiation may result in an unreal bone conduction threshold, promoting an unreal air/bone gap in the high frequencies. AIM: aim to analyze the acoustic radiation effect on the extension of air/bone gap at 2,000, 3,000 and 4,000 Hz. MATERIALS AND METHOD: our clinical and experimental study had a sample of 101 individuals, who matched inclusion criteria: to have an air/bone gap higher than 10 dB in the frequencies of 2,000; 3,000 and 4,000 Hz. All of them had their bone conduction threshold measured in two conditions: open ear canal and closed ear canal. RESULTS: we found that major differences between the two conditions evaluated occurred at the 4,000 Hz; data analysis showed significant difference in the extension for the air/bone gap; analysis of the number of cases of mixed hearing loss that changed to sensorineural was significant too. CONCLUSION: These studies concluded that when the MAE is occluded, the acoustic radiation phenomenon is controlled or avoided, enabling bone measures at the frequencies of 3,000 and 4,000Hz to be more accurate.
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matos2010brazilianefeitos
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| Authors | ;Renata das Merces Bastos de Matos;Silvania de Paula Valle;Anna Marcella Neves Dias;Teresa Maria Momensohn dos Santos;Isabel Cristina Gonçalves Leite |
| Journal | cardiovascular diabetology |
| Year | 2010 |
| DOI |
10.1590/S1808-86942010000500020
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