What is the definition of tachycardia?

• A. A slower than normal heart rate
• B. A heart rate over 100 BPM
• C. A heart rate over 160 BPM
• D. A normal heart rate at rest

Answer: (B)

Tachycardia is defined as a heart rate that exceeds 100 beats per minute (BPM) in adults when at rest. This elevated heart rate is a response that can occur due to various physiological factors such as stress, exercise, or underlying medical conditions. Understanding this definition is crucial in clinical settings, where recognizing tachycardia can indicate important health issues or the need for intervention.

The other responses reference heart rates that do not align with the established definition of tachycardia. A slower than normal heart rate is referred to as bradycardia, while a heart rate over 160 BPM may indicate severe tachycardia or may even require immediate medical attention depending on the context. A normal heart rate at rest is typically between 60 to 100 BPM, which does not fit the characterization of tachycardia. Hence, identifying that a heart rate over 100 BPM is the benchmark for defining tachycardia is key to understanding cardiovascular health.