West and Evans noted that exposure to intense sounds of rock music is for most young people the only significant threat to their hearing and recommended those who had experienced either tinnitus or temporary threshold shift
associated with such exposure should avoid such high level sounds.
Therefore, a need for initial site evaluations and for baseline hearing assessments has been established, as well as the need for annual audiograms to evaluate for standard threshold shift
Animals treated with N-acetylcysteine showed a similar temporary threshold shift
but a clear improvement in the recovery of compound action potential thresholds, with significantly reduced permanent threshold shift
and hair cell loss.
In the nanoscale color detector, light strikes a chromophore and causes a conformational change in the molecule, which in turn causes a threshold shift
on a transistor made from a single-walled carbon nanotube.
Rudmose and Ward independently demonstrated that when high intensity pure tones reach the cochlea in the 1 kHz to 3 kHz frequency range, the resulting threshold shift
occurs approximately a half to one whole octave above the pure tone exposure.
A threshold shift
is just a fancy way of saying that the quietest level at which you once could hear (your threshold for hearing) has changed significantly--for the worse.
Although significantly less than that associated with an immediate permanent threshold shift
, such an exposure could cause a temporary threshold shift
Defines work-related significant threshold shift
for entry into WESS as an occupational injury.
We conducted a study to determine whether N-Acetyl-cysteine (NAC) protected men against noise-induced temporary threshold shift
(TTS), and whether subgroups with genetic polymorphisms of glutathione S-transferase (GST) T1 and M1 responded to NAC differently.
They found that Soldiers who had deployed to a combat zone showed exponentially higher rates of noise-induced hearing loss, acoustic trauma, permanent threshold shift
, tinnitus, eardrum perforation, and H3 or H4 profile (defined in Table 1) compared to those who had not deployed.
I am very encouraged by these results that we may be able to find a way to diminish permanent threshold shift
with noise exposure.
This may result in an abnormal, audiometrically induced bone-conduction threshold shift
and suggest to the otologist the need for auditory brainstem response testing and/or magnetic resonance imaging.