Impedance shift detection

A system for determining a detection of an impedance shift, comprising:

• a computing device comprising processor resources and memory resources, the memory resources storing computer-readable instructions that, when executed by the processor resources, cause the processor resources to:
• determine a pre-shift set of fiducials that includes for each fiducial a pre-shift fiducial impedance location and a pre-shift fiducial magnetic location, the pre-shift fiducial impedance locations and the pre-shift fiducial magnetic locations being associated with a medical device;
• determine a post-shift set of fiducials that includes for each fiducial a post-shift fiducial impedance location and a post-shift fiducial magnetic location, the post-shift fiducial impedance locations and the post-shift fiducial magnetic locations being associated with the medical device;
• fit a pre-shift transformation to the pre-shift set of fiducials and a post-shift transformation to the post-shift set of fiducials;
• determine that a distance, at a current location of the medical device, between the pre-shift transformation and the post-shift transformation exceeds a threshold distance;
• determine a statistical confidence that the distance exceeds the threshold distance;
• determine that the statistical confidence exceeds a threshold confidence;
• determine that an impedance shift has occurred, based on the distance exceeding the threshold distance and the statistical confidence exceeding the threshold confidence;
• and
• generate the indication that the impedance shift has occurred.