ObjectiveTo study the auditory cortex evoked potential (CAEP) test in the sound field of hearing-impaired children with dual-mode hearing intervention after cochlear implantation, the correlation between P1 wave latency, amplitude and auditory speech ability. To analyze the influence of implantation age and wearing time on the CAEP P1 wave latency of hearing-impaired children under dual-mode hearing intervention, so as to guide clinical practice.MethodsTwenty-nine hearing-impaired children with dual-mode hearing intervention were subjected to CAEP test, and CAP-II and SIR evaluation under short pure tone stimulation of 500 Hz, 1000 Hz, 2 000 Hz and 4 000 Hz. The correlations between the latency and amplitude of CAEP P1 wave and CAP-Ⅱ and SIR were analyzed, and the effects of implantation age and wearing time on the latency of CAEP P1 wave in dual-mode hearing intervention were explored.ResultsP1 wave latency was negatively correlated with CAP-II and SIR. The amplitude of P1 wave was positively correlated with CAP-Ⅱ and SIR. Under the stimulation of 1 000 Hz frequency, P1 latency was negatively correlated with CAP-Ⅱ (r = -0.388, P < 0.05). Under 500 Hz tone burst stimulation, the amplitude of P1 wave was positively correlated with CAP-II and SIR scores (r = 0.428, r = 0.463, P < 0.05). Multivariate regression analysis of the latency and amplitude of CAEP P1 wave under different frequencies of short pure tone stimulation showed that at 500 Hz (F = 4.362, P = 0.023) and 4 000 Hz (F = 4.056, P = 0.016), the overall regression equation test was statistically significant. The latency of 500 Hz CAEP P1 was negatively correlated with the age of cochlear implantation and the length of wearing time. When the age of cochlear implantation was controlled, the latency of P1 decreased by 0.632 ms for each additional month of implantation time, (t= -2.907, P < 0.05). The P1 latency of 4 000 Hz CAEP was positively correlated with the age of cochlear implantation and the length of wearing time. Under the condition of constant wearing time, the average P1 latency was prolonged by 0.654 ms for each additional month of implantation time at the age of implantation (t = 3.270, P < 0.05).ConclusionsCAEP can be used as an effective evaluation method for the rehabilitation effect of dual-mode hearing intervention, and the results of CAEP evaluation can guide clinical adjustment. Early intervention and adherence to dual-mode hearing intervention can effectively stimulate the development and maturation of the auditory cortex.