A system comprising: a display, wherein the display comprises a graphical user interface configured to assist a user in evaluating patient cardiac health; an electrode apparatus comprising a plurality of external electrodes to monitor electrical activity from tissue of a patient; and a computing apparatus comprising processing circuitry and coupled to the electrode apparatus and configured to: monitor electrical activity from the patient using the plurality of external electrodes; provide a model heart representative of the patient's heart based on at least one of a plurality of patient characteristics, wherein the model heart comprises a plurality of segments; map the monitored electrical activity onto the plurality of segments of the model heart; and determine a value of electrical activity for each of a plurality of anatomic regions of the model heart based on the mapped electrical activity, wherein each of the plurality of anatomic regions comprises a subset of the plurality of segments, wherein the computing apparatus is further configured to: compare values of adjacent anatomic regions of the plurality of anatomic regions; and determine slow conduction or conduction block conditions between compared adjacent anatomic regions based on the compared values, wherein the computing apparatus is further configured to display, on the graphical user interface, the model heart and the mapped electrical activity, wherein the computing apparatus is further configured to display a graphical element indicative of a location of the determined slow conduction or conduction block conditions on the model heart. a display, wherein the display comprises a graphical user interface configured to assist a user in evaluating patient cardiac health; an electrode apparatus comprising a plurality of external electrodes to monitor electrical activity from tissue of a patient; and a computing apparatus comprising processing circuitry and coupled to the electrode apparatus and configured to: monitor electrical activity from the patient using the plurality of external electrodes; provide a model heart representative of the patient's heart based on at least one of a plurality of patient characteristics, wherein the model heart comprises a plurality of segments; map the monitored electrical activity onto the plurality of segments of the model heart; and determine a value of electrical activity for each of a plurality of anatomic regions of the model heart based on the mapped electrical activity, wherein each of the plurality of anatomic regions comprises a subset of the plurality of segments, wherein the computing apparatus is further configured to: compare values of adjacent anatomic regions of the plurality of anatomic regions; and determine slow conduction or conduction block conditions between compared adjacent anatomic regions based on the compared values, monitor electrical activity from the patient using the plurality of external electrodes; provide a model heart representative of the patient's heart based on at least one of a plurality of patient characteristics, wherein the model heart comprises a plurality of segments; map the monitored electrical activity onto the plurality of segments of the model heart; and determine a value of electrical activity for each of a plurality of anatomic regions of the model heart based on the mapped electrical activity, wherein each of the plurality of anatomic regions comprises a subset of the plurality of segments, wherein the computing apparatus is further configured to: compare values of adjacent anatomic regions of the plurality of anatomic regions; and determine slow conduction or conduction block conditions between compared adjacent anatomic regions based on the compared values, compare values of adjacent anatomic regions of the plurality of anatomic regions; and determine slow conduction or conduction block conditions between compared adjacent anatomic regions based on the compared values, wherein the computing apparatus is further configured to display, on the graphical user interface, the model heart and the mapped electrical activity, wherein the computing apparatus is further configured to display a graphical element indicative of a location of the determined slow conduction or conduction block conditions on the model heart.