Table 1 Summary of experimental groups, intensity and rise time of impulse noise, degree of threshold shift and possible protection by furosemide
From: Effects of furosemide on the hearing loss induced by impulse noise
| Â | Noise | Â | Â | Â | |
|---|---|---|---|---|---|
|  | Intensity (dB SPL) | Presumed rise time (μsec) | TS (dB) | Furosemide protection | Explanation (see text for details) |
Simulated MI6; sound effects site | |||||
Experiment Ia - Computer speaker (mice) | 123 | >88 | NS | NA | Intensity too low |
Ib - Power amplifier, very large speaker (Psammomys) | 155 | >>88 | NS | NA | Rise time too slow |
II - 20W speaker (mice) | 135 | >88 | 11.9 | Total | Active displacements reduced by furosemide |
III - Small exposure chamber (mice) | 155 | >88 | 22.5 | Total | Active displacements reduced by furosemide |
Actual M16; firing range | |||||
IV - Actual M16; firing range (mice) | 155 | 88 | 13.7 | None | Tearing damage; furosemide not effective |