What identifies a cardiac rhythm as tachycardic?

A cardiac rhythm is identified as tachycardic when the heart rate exceeds 100 beats per minute (bpm) for adults. This threshold is important because it helps clinicians distinguish between normal sinus rhythm and an abnormal increase in heart rate, which may indicate an underlying arrhythmia or other medical conditions. In adults, normal resting heart rates typically range from 60 to 100 bpm, making values above 100 bpm significant in diagnosing tachycardia. The use of this specific threshold facilitates timely identification and intervention for potential cardiovascular issues, enhancing patient care.