Telemetry Certification Practice Test 2025 - Free Telemetry Practice Questions and Study Guide

The statement that demand mode pacing only sends impulses when the heart rate drops below a set threshold is accurate. In this pacing mode, the device monitors the heart's electrical activity in real-time. It functions by delivering electrical impulses only when it detects that the heart rate falls below a pre-determined threshold, which is typically set to maintain an appropriate minimum heart rate for the patient. This method allows the heart to beat naturally when its rhythm is adequate, thus conserving battery life and reducing unnecessary stimulation.

The other options do not accurately describe demand mode pacing. For instance, continuous pacing regardless of the heart's rate implies a fixed or synchronous approach, which is characteristic of different pacing modes, such as fixed rate pacing. Stating that demand mode is the least safe would be misleading, as demand pacing is widely regarded as a safe and effective approach because it allows for natural heart rhythms to function when they are adequate. Similarly, fixed rate stimulation at all times does not apply to demand mode, which is defined precisely by its responsiveness to the heart's own activity.