A customizable electrophysiological mapping sensor patch configured for placement on and attachment to a patient's torso , comprising: a first substantially planar layer comprising at least a first flexible material; a second substantially planar electrically insulative layer comprising at least a second flexible material; a plurality of flexible electrical conductors (EC) disposed on or within the first layer, or disposed at least partially between the first layer and the second layer, each of the flexible electrical conductors having at least first proximal and second distal ends; a plurality of sensing electrodes (E), each sensing electrode being operably connected to one of the electrical conductors; a plurality of adhesive members (AD), each adhesive member surrounding at least partially a corresponding one or more of the sensing electrodes, and at least one score line (SL) disposed in the mapping sensor patch, the score line defining at least one pre-cut portion of the mapping sensor patch including corresponding sensing electrodes, the score line being configured to permit a user to remove or partially remove the at least one pre-cut portion from the mapping sensor patch, thus removing the corresponding sensing electrodes, by pulling or cutting the mapping sensor patch or pre-cut portion along or near the score line; characterized in that the at least one pre-cut portion of the patch comprises one or more of a row pre-cut (RPC), designed for removing a corresponding row of sensing electrodes to customize the height of the mapping sensor patch, one or more of a column pre-cut (CPC), designed for removing a corresponding column of sensing electrodes to customize the width of the mapping sensor patch, and one or more of: a cardioversion patch pre-cut (CPPC), a navigation patch pre-cut (NPPC), a ground patch pre-cut (GPPC), a female anatomy customization pre-cut (FAPC), an actuator pre-cut, a sensor pre-cut, or an anatomical reference mark pre-cut (APC). a first substantially planar layer comprising at least a first flexible material; a second substantially planar electrically insulative layer comprising at least a second flexible material; a plurality of flexible electrical conductors (EC) disposed on or within the first layer, or disposed at least partially between the first layer and the second layer, each of the flexible electrical conductors having at least first proximal and second distal ends; a plurality of sensing electrodes (E), each sensing electrode being operably connected to one of the electrical conductors; a plurality of adhesive members (AD), each adhesive member surrounding at least partially a corresponding one or more of the sensing electrodes, and at least one score line (SL) disposed in the mapping sensor patch, the score line defining at least one pre-cut portion of the mapping sensor patch including corresponding sensing electrodes, the score line being configured to permit a user to remove or partially remove the at least one pre-cut portion from the mapping sensor patch, thus removing the corresponding sensing electrodes, by pulling or cutting the mapping sensor patch or pre-cut portion along or near the score line; <EOS>