3.2.3 ABR
As for ABR examinations, all the 10 patients were evaluated as having an abnormal ABR according to the diagnostic criteria mentioned above. The sensitivity of ABR for the detection of AN was 100% in our study. Table 2 demonstrated the latency of ABR waves of the 10 enrolled patients. In these patients who showed an abnormal ABR waveform pattern, no response was detected in 2 patients (20%) at 100 dB SPL, 2 patients (20%) had only wave V present, 3 patients (30%) showed the absence of wave I, 2 patients (20%) with IPL between waves I and III > 2.5 ms, 4 patients (40%) with IPL between waves I and V > 4.4 ms. Significantly, except for 2 patients with no response, the ILD of wave V were all > 0.2 ms in the remaining 8 patients, with a mean value of 1.01 ± 0.43 ms.