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. Author manuscript; available in PMC: 2015 Nov 23.
Published in final edited form as: Circ Arrhythm Electrophysiol. 2015 Apr 14;8(3):554–561. doi: 10.1161/CIRCEP.115.002721

Figure 6.

Figure 6

Atrial electrogram analysis: local activation time. A, Top, Surface ECG lead II. Bottom, Local electrogram (EGM) from a rotor site recorded by using a basket catheter. Only ventricular activation can be seen on the local tracing. B, On this unipolar recording with a voltage of 0.06 mV, low-amplitude atrial EGM can be seen, but activation time cannot be accurately annotated. C, On this unipolar recording with a voltage of 0.28 mV, atrial EGM is decipherable and shows variable cycle length.