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. Author manuscript; available in PMC: 2011 Aug 24.
Published in final edited form as: Circulation. 2010 Aug 9;122(8):782–789. doi: 10.1161/CIRCULATIONAHA.109.935288

Figure 4. SAN activation during fast atrial pacing and 2 μM ACh.

Figure 4

Panel A - A dominant Frequency map of epicardial OAPs recorded during atrial pacing at a CL of 140 ms with 2 μM Ach along with OAPs and their frequency power spectrums selected from the SAN center (blue #1), inferior SAN (red #2) and right atrial free wall ( green #3). Arrows in the color maps show functional SACPs during pacing.

Panel B - Atrial activation map.

Panel C and D – enlarged views of SAN activations corresponding to the OAPs shown in Panel A, indicated by pink dashed lines.