. . . . "Summary (Mean) P AxisPTCDISCSDTM-EGTEST" . "EKG_Mean_P_Axis"^^ . . "C62121"^^ . "Mean P Axis"^^ . "Mean P Axis"^^ . . "PAXISPTCDISCSDTM-EGTESTCD" . "Summary (Mean) P AxisSYCDISC" . . "C1880447"^^ . "Summary (Mean) P AxisSYNCI" . "The mean (average) direction (range -180 degrees to 180 degrees) of the electrical potential generated by atrial depolarization in a particular plane (usually the frontal plane). (NCI)CDISC" . "CDISC"^^ . "The mean (average) direction (range -180 degrees to 180 degrees) of the electrical potential generated by atrial depolarization in a particular plane (usually the frontal plane).NCI" . "Quantitative Concept"^^ . "Mean P AxisPTNCI" .