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Figure 4 Atrial EGM Recording During Adenosine Infusion
(A) Fluoroscopic image in the left anterior oblique view of typical intracardiac catheter locations during adenosine infusion. (B) Superimposition of the surface electrocardiogram P-wave in lead V1 and atrial EGM. CS = coronary sinus catheter; ICE = intracardiac echocardiography catheter; LA = left atrial catheter; RA = right atrial catheter; RV = right ventricular catheter; other abbreviations as in Figure 2.