77 year old male with a left subclavicular scar.
- Algorithmic pacing
- Prominent U waves
Discussion: The lack of proper pacemaker diagnostic codes on the ABIM coding sheet is highlighted here. This is a normally functioning pacemaker that is intermittently pacing the ventricle in response to a PAC due to ventricular based timing rules. If a ventricular sensed event is not sensed within a given interval it will pace the ventricle at the expense of the AV delay.