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Figure 3 Electrogram recordings with a magnetic catheter. Surface electrocardiograms (ECGs) and intracardiac electrograms recorded from a single patient with Wolff-Parkinson-White syndrome are shown. Intracardiac recordings made with both a standard 4-mm-tipped ablation catheter and the magnetic catheter at the high right atrium (HRA), right ventricle apex (RVA), His bundle (His), and ventricular insertion of the accessory pathway are shown. Electrograms were recorded sequentially from the recording sites and are displayed in registry with the surface ECGs. Surface and intracardiac electrograms were not compromised by the magnetic field. The vertical scale is 5 mV, and the horizontal scale is 400 ms.
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