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With regard to this caption

Atrial paced rhythm shows atrial pacemaker spikes. The first venricular beat on this image is paced as well.

It is likely that all of the ventricular complexes are paced (or none of them), since the morphology of the QRS, ST, and T are all identical to the first "ventricular beat". Even slight variances in pacemaker location would cause at least subtle changes in morphology. Best, Tom Bouthillet 19:00, 6 December 2007 (MET)Tom Bouthillet