There are pacing spikes followed by broad ventricular beats (ventricular capture)

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There are both intrinsic p waves and pacing spikes followed by a p wave.

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After each atrial event is a ventricular paced beat. Appears to be consistent with DDD mode and atrium is being sensed appropriately.

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There are variations in the PR interval. Beats 1 & 7-12 have PR

~200ms, where as beats 2-6 have a prolonged PR interval ~400ms.

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This is consistent with an AV search algorithm whic was subsequently turned off due to permanent AV block