Question

When a telemetry monitor shows an erratic waveform that disappears when the patient remains perfectly still, what is the most likely cause of this signal variation?

Accepted Answer

The most likely cause of this signal variation is artifact, specifically somatic tremor or motion artifact. Artifact is defined as any electrical signal detected by a monitor that does not originate from the patient&#x27;s heart. In this scenario, the erratic waveform is caused by electrical interference from the patient&#x27;s skeletal muscles. When a patient moves, shifts position, or experiences muscle tremors, the contraction of their muscles generates small electrical currents. The telemetry electrodes, which are designed to detect the weak electrical impulses of the heart, also pick up these larger electrical signals from the muscles. The monitor interprets these muscle signals as irregular heartbeats or noise, causing the waveform on the screen to appear erratic or distorted. When the patient remains perfectly still, the muscle activity ceases, removing the interference and allowing the monitor to display the clear, rhythmic electrical activity of the heart without the disruptive background noise.

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When a telemetry monitor shows an erratic waveform that disappears when the patient remains perfectly still, what is the most likely cause of this signal variation?