Barbosa Tania Alves, Durante Alessandra Spada, Granato Lidio
Faculty of Medical Sciences, Santa Casa de São Paulo, São Paulo, SP, Brazil.
Department of Otorhinolaryngology, Faculty of Medical Sciences, Santa Casa de São Paulo, São Paulo, SP, Brazil.
Rev Assoc Med Bras (1992). 2014 Nov-Dec;60(6):591-8. doi: 10.1590/1806-9282.60.06.020.
The recording of otoacoustic emissions (OAE) enabled us to prove that the cochlea is able not only to receive sounds but also to produce acoustic energy. Through the use of distortion-product otoacoustic emission measurements, the growth of the response was seen according to the intensity of the sound stimulus presented (growth curve).
to determine the thresholds for the emergence of distortion-product otoacoustic emissions (DPOAE) on frequencies of 2000 and 4000 Hz with a stimulus varying from 20 to 65 dB SPL, and to establish the slope values obtained in the growth curves.
39 neonates aged 5 to 28 days without risk indicators of hearing loss were studied. The DPOAE growth curves were obtained on the frequencies from 2000 Hz and 4000 Hz with a level of intensity ranging from 20 to 65 dB SPL divided into two paradigms (20 to 40 dB SPL and 40-65 dB SPL).
there was a statistically significant difference in the thresholds for the emergence of DPOAE depending on the criteria used. The thresholds were on average higher at 4000 Hz than 2000 Hz and the slope was higher on average at 2000 Hz than 4000 Hz, although not statistically significant in either case.
the thresholds were on average 30 dB SPL at 2000 Hz and 35 dB SPL at 4000 Hz. The slope values varied between 3 and 4 on average, reaching 15 in some cases.
耳声发射（OAE）的记录使我们能够证明，耳蜗不仅能够接收声音，还能够产生声能。通过使用畸变产物耳声发射测量，可观察到响应随所呈现声音刺激强度的增加而增长（增长曲线）。
确定在20至65 dB SPL的刺激下，2000 Hz和4000 Hz频率处畸变产物耳声发射（DPOAE）出现的阈值，并确定增长曲线中获得的斜率值。
对39名年龄在5至28天、无听力损失风险指标的新生儿进行研究。在2000 Hz和4000 Hz频率上获得DPOAE增长曲线，强度水平范围为20至65 dB SPL，分为两个范式（20至40 dB SPL和40 - 65 dB SPL）。
根据所使用的标准，DPOAE出现的阈值存在统计学显著差异。4000 Hz处的阈值平均高于2000 Hz，2000 Hz处的斜率平均高于4000 Hz，尽管在两种情况下均无统计学显著性。
2000 Hz处的阈值平均为30 dB SPL，4000 Hz处为35 dB SPL。斜率值平均在3至4之间，某些情况下可达15。
