A system and method are provided for developing a database of body surface ECG P-wave maps for classification and localization of left-sided atrial arrhythmias. The system includes an ultrasound catheter including an ultrasound transducer probe. The invention also relates to articles prepared from such plasticized polymer compositions. When the supercharger is in an idle mode of operation at low supercharger speeds it does not boost torque, and when it is in a boost mode of operation at high supercharger speeds, it does boost engine toque. The user location may be remote from the plurality of computing systems. A portion adjacent to a portion where the solder bump pattern is formed on the printed circuit board is placed on a reference supporting surface provided in continuation from the board support and adapted to restrict a reference position of the printed circuit board.