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Figure 2 Magnetic navigation. (A) Photograph of catheter navigation with the magnetic guidence system. The catheter is guided by drawing a magnetic field vector on a graphical digitization tablet at the side of the fluoroscopy table as shown. The magnetic field vector is drawn and displayed overlying two orthogonal fluoroscopic views to specify a unique three-dimensional magnetic field vector. The magnetic field is then activated through the digitization tablet, and the catheter aligns parallel with the selected magnetic field vector. (B) Orthogonal fluoroscopic views used to specify the magnetic field vector. The images displayed (left anterior oblique [left], right anterior oblique [right]) show the magnetic catheter aligning parallel to the chosen magnetic field vector to reach the His bundle recording site in a patient.
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