Which of the following indicates an abnormal heart rate in telemetry monitoring?

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A heart rate that is considered abnormal in telemetry monitoring is defined by values outside the normal resting range, typically recognized as 60 to 100 beats per minute (bpm). Therefore, when a heart rate is recorded as less than 60 bpm, it indicates bradycardia, and when it exceeds 100 bpm, it signifies tachycardia. Both these conditions can be associated with various medical issues, necessitating closer observation and potentially medical intervention.

The other options describe situations that fall within the normal range or are not indicative of an abnormality. For instance, a heart rate consistently above 80 bpm (option C) is still within acceptable limits, as is a fluctuating heart rate between 70 to 90 bpm (option D), which does not suggest any immediate concern. Therefore, focusing on the thresholds of less than 60 bpm or greater than 100 bpm accurately identifies the abnormal heart rates that require further assessment.