What pattern is usually observed in noise-induced hearing loss in the high frequency range?

In cases of noise-induced hearing loss, a characteristic "notch" pattern is typically observed, especially at the higher frequencies. This pattern is primarily identified as a dip in hearing sensitivity at specific high frequencies, most commonly around 4000 Hz.

This notch often signifies damage to the hair cells in the inner ear that are responsible for processing higher-frequency sounds. Exposure to loud noise can lead to this type of hearing loss, where the thresholds for hearing at these frequencies are notably poorer than those at lower frequencies, creating a distinct visual representation on an audiogram.

The other patterns, such as flat, rising, or encroaching, do not accurately represent the typical effects of noise exposure on hearing. A flat pattern would indicate similar levels of hearing loss across frequencies, a rising pattern suggests improvement in hearing thresholds at higher frequencies, and encroaching doesn't reflect the standard patterns seen with noise-induced damage. The "notch" is therefore the hallmark sign for this specific type of hearing impairment.