A system comprising: an electro-acoustic stimulation ("EAS") sound processor configured to be located external to a patient; a cochlear implant communicatively coupled to the EAS sound processor and configured to be implanted within the patient; an electrode array communicatively coupled to the cochlear implant and configured to be located within a cochlea of the patient; and a receiver communicatively coupled to the EAS sound processor and configured to be in communication with an ear of the patient; wherein the EAS sound processor is configured to enter a self-fitting mode in which the EAS sound processor does not direct the cochlear implant and/or the receiver to apply, to the patient, electrical and/or acoustic stimulation representative of audio signals presented to the patient, direct, while in the self-fitting mode, the receiver to apply acoustic stimulation to the patient, the acoustic stimulation not representative of an audio signal presented to the patient, record, using at least one electrode included in the electrode array, an evoked response that occurs in response to the acoustic stimulation applied while the EAS sound processor is in the self-fitting mode, compare the evoked response to a baseline evoked response recorded by the EAS sound processor prior to recording the evoked response, and perform a predetermined action based on the comparison between the evoked response and the baseline evoked response, wherein a processing facility of the EAS sound processor is configured to compare slopes of the evoked response with slopes of the baseline evoked response when comparing the evoked response to the baseline evoked response. an electro-acoustic stimulation ("EAS") sound processor configured to be located external to a patient; a cochlear implant communicatively coupled to the EAS sound processor and configured to be implanted within the patient; an electrode array communicatively coupled to the cochlear implant and configured to be located within a cochlea of the patient; and a receiver communicatively coupled to the EAS sound processor and configured to be in communication with an ear of the patient; wherein the EAS sound processor is configured to enter a self-fitting mode in which the EAS sound processor does not direct the cochlear implant and/or the receiver to apply, to the patient, electrical and/or acoustic stimulation representative of audio signals presented to the patient, direct, while in the self-fitting mode, the receiver to apply acoustic stimulation to the patient, the acoustic stimulation not representative of an audio signal presented to the patient, record, using at least one electrode included in the electrode array, an evoked response that occurs in response to the acoustic stimulation applied while the EAS sound processor is in the self-fitting mode, compare the evoked response to a baseline evoked response recorded by the EAS sound processor prior to recording the evoked response, and perform a predetermined action based on the comparison between the evoked response and the baseline evoked response, wherein the EAS sound processor is configured to enter a self-fitting mode in which the EAS sound processor does not direct the cochlear implant and/or the receiver to apply, to the patient, electrical and/or acoustic stimulation representative of audio signals presented to the patient, direct, while in the self-fitting mode, the receiver to apply acoustic stimulation to the patient, the acoustic stimulation not representative of an audio signal presented to the patient, record, using at least one electrode included in the electrode array, an evoked response that occurs in response to the acoustic stimulation applied while the EAS sound processor is in the self-fitting mode, compare the evoked response to a baseline evoked response recorded by the EAS sound processor prior to recording the evoked response, and perform a predetermined action based on the comparison between the evoked response and the baseline evoked response, wherein a processing facility of the EAS sound processor is configured to compare slopes of the evoked response with slopes of the baseline evoked response when comparing the evoked response to the baseline evoked response.