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 (114, 116) 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 direct at least one of the cochlear implant and the receiver to apply stimulation to the patient, record an evoked response that occurs in response to the stimulation, and perform a predetermined action in accordance with the evoked response, wherein the predetermined action comprises evaluating a residual hearing status of the patient in accordance with the evoked response and to automatically adjust, in response, one or more control parameters governing an operation of the EAS system by increasing or decreasing an amplitude and/or intensity level of stimulation being provided to the patient in such a manner that an amplitude and/or intensity level of stimulation is increased when the patient's residual hearing is found to deteriorate and that an amplitude and/or intensity level of stimulation is decreased when the patient's residual hearing is found to increase. 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 (114, 116) 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 direct at least one of the cochlear implant and the receiver to apply stimulation to the patient, record an evoked response that occurs in response to the stimulation, and perform a predetermined action in accordance with the evoked response, wherein the predetermined action comprises evaluating a residual hearing status of the patient in accordance with the evoked response and to automatically adjust, in response, one or more control parameters governing an operation of the EAS system by increasing or decreasing an amplitude and/or intensity level of stimulation being provided to the patient in such a manner that an amplitude and/or intensity level of stimulation is increased when the patient's residual hearing is found to deteriorate and that an amplitude and/or intensity level of stimulation is decreased when the patient's residual hearing is found to increase. direct at least one of the cochlear implant and the receiver to apply stimulation to the patient, record an evoked response that occurs in response to the stimulation, and perform a predetermined action in accordance with the evoked response, wherein the predetermined action comprises evaluating a residual hearing status of the patient in accordance with the evoked response and to automatically adjust, in response, one or more control parameters governing an operation of the EAS system by increasing or decreasing an amplitude and/or intensity level of stimulation being provided to the patient in such a manner that an amplitude and/or intensity level of stimulation is increased when the patient's residual hearing is found to deteriorate and that an amplitude and/or intensity level of stimulation is decreased when the patient's residual hearing is found to increase.