Figure 2
From: Pathophysiology of the inner ear after blast injury caused by laser-induced shock wave
Measurement of hearing function using ABR and DPOAE before and after LISW exposure.
(a–c) Significant ABR threshold shifts one day after LISW (filled squares) exposure were observed up to 1 month after exposure (filled diamonds) in the 2.25 (b) and 2.5 J/cm2 (c) groups compared to the pre-exposure thresholds (filled circles). (d–f) Despite the absence of ABR threshold elevation, the wave I amplitude was decreased in the 2.0 J/cm2 (d) group, which was also seen in the 2.25 (e) and 2.5 J/cm2 (f) groups. (g–i) The DPOAE level in the 2.5 J/cm2 (i) group was significantly decreased, whereas no decrease was observed in the 2.0 (g) or 2.25 J/cm2 (h) group. Asterisks indicate significant differences (p < 0.05) compared to the pre-exposure values. Error bars indicate SEs of the means (n = 5 in each group). ABR, auditory brainstem response; DPOAE, distortion product otoacoustic emission; LISW, laser-induced shock wave.
