A system for use in cardiac therapy comprising: electrode apparatus comprising a plurality of electrodes configured to be located proximate tissue of a patient; display apparatus comprising a graphical user interface, wherein the graphical user interface is configured to present information for use in assisting a user in at least one of assessing a patient's cardiac health, evaluating and adjusting cardiac therapy delivered to a patient, and navigating at least one implantable electrode to a region of the patient's heart; and computing apparatus coupled to the electrode apparatus and display apparatus, characterized in that the computing apparatus is configured to perform an effectiveness test for each electrode of the plurality of electrodes resulting in an effectiveness value for each electrode, wherein, to perform the effectiveness test for each electrode, the computing apparatus is further configured to: monitor a signal from the patient using the electrode, store a portion of the signal over a preset time period for each cardiac cycle of at least two cardiac cycles, wherein each portion corresponds to the same time frame within each cardiac cycle, compare at least two stored portions of the signal to provide the effectiveness value representative of the effectiveness of the electrode for sensing signals from the tissue of the patient, and display, on the graphical user interface, information for use in assisting a user in at least one of assessing a patient's cardiac health, evaluating and adjusting cardiac therapy delivered to a patient, and navigating at least one implantable electrode to a region of the patient's heart. electrode apparatus comprising a plurality of electrodes configured to be located proximate tissue of a patient; display apparatus comprising a graphical user interface, wherein the graphical user interface is configured to present information for use in assisting a user in at least one of assessing a patient's cardiac health, evaluating and adjusting cardiac therapy delivered to a patient, and navigating at least one implantable electrode to a region of the patient's heart; and computing apparatus coupled to the electrode apparatus and display apparatus, characterized in that the computing apparatus is configured to perform an effectiveness test for each electrode of the plurality of electrodes resulting in an effectiveness value for each electrode, wherein, to perform the effectiveness test for each electrode, the computing apparatus is further configured to: monitor a signal from the patient using the electrode, store a portion of the signal over a preset time period for each cardiac cycle of at least two cardiac cycles, wherein each portion corresponds to the same time frame within each cardiac cycle, compare at least two stored portions of the signal to provide the effectiveness value representative of the effectiveness of the electrode for sensing signals from the tissue of the patient, and display, on the graphical user interface, information for use in assisting a user in at least one of assessing a patient's cardiac health, evaluating and adjusting cardiac therapy delivered to a patient, and navigating at least one implantable electrode to a region of the patient's heart. monitor a signal from the patient using the electrode, store a portion of the signal over a preset time period for each cardiac cycle of at least two cardiac cycles, wherein each portion corresponds to the same time frame within each cardiac cycle, compare at least two stored portions of the signal to provide the effectiveness value representative of the effectiveness of the electrode for sensing signals from the tissue of the patient, and display, on the graphical user interface, information for use in assisting a user in at least one of assessing a patient's cardiac health, evaluating and adjusting cardiac therapy delivered to a patient, and navigating at least one implantable electrode to a region of the patient's heart.