Pacemaker oversensing would most likely cause which outcome?

Pacemaker oversensing would most likely cause which outcome?

• A. Inappropriate inhibition of pacing due to sensing noncardiac signals
• B. Increased pacing rate due to detection of artifacts
• C. Loss of telemetry data
• D. Battery depletion

Answer: (A)

Oversensing means the pacemaker is picking up signals that aren’t true cardiac activity and mistakes them for intrinsic heartbeats. When this happens, the device thinks the heart is beating on its own and therefore withholds pacing to avoid competing with a sensed beat. That inhibition can lead to pauses and a slower heart rate, which is the classic consequence and why this choice is correct. The other outcomes don’t fit the typical effect of oversensing. It wouldn’t cause the device to speed up in response to artifacts; the problem is inhibition, not acceleration. Telemetry data loss isn’t a direct result of oversensing, and battery depletion isn’t an immediate or direct consequence of sensing noncardiac signals.

Oversensing means the pacemaker is picking up signals that aren’t true cardiac activity and mistakes them for intrinsic heartbeats. When this happens, the device thinks the heart is beating on its own and therefore withholds pacing to avoid competing with a sensed beat. That inhibition can lead to pauses and a slower heart rate, which is the classic consequence and why this choice is correct.

The other outcomes don’t fit the typical effect of oversensing. It wouldn’t cause the device to speed up in response to artifacts; the problem is inhibition, not acceleration. Telemetry data loss isn’t a direct result of oversensing, and battery depletion isn’t an immediate or direct consequence of sensing noncardiac signals.