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Intracardiac catheterization for programmed electrical stimulation. A: designation of four bipolar leads on an octopolar catheter. B: placement of the catheter inside the heart. C: representative simultaneous recording of surface electrocardiogram (ECG) (lead 2) and intracardiac electrograms from four bipolar leads (A, atria, H, His bundle, and V, ventricle). Created partially using Biorender.com and published with permission.
