What defines tachycardia in adults?

Tachycardia in adults is defined as a heart rate that exceeds 100 beats per minute (bpm). This elevated heart rate can be a physiological response to various conditions, such as exercise, stress, fever, or underlying medical problems. When the heart beats faster than normal, it may indicate that the body is working harder to meet increased demands for oxygen or to compensate for other issues.

In contrast, a heart rate over 80 bpm is generally considered within normal limits, especially as heart rates can vary based on individual fitness levels, age, and activity. Similarly, heart rates under 60 bpm indicate bradycardia, which is the opposite of tachycardia. Rates between 60-80 bpm are usually categorized as normal resting heart rates. Understanding these parameters is critical for nurses and healthcare providers when assessing patients and determining the need for further investigation or intervention.