What is the definition of tachycardia?

• A. A heart rate of over 80 beats per minute
• B. A heart rate of over 100 beats per minute
• C. A heart rate of under 60 beats per minute
• D. A heart rate of 60-100 beats per minute

Answer: (B)

Tachycardia is defined as a heart rate that exceeds the normal range expected for adults, which typically is between 60 to 100 beats per minute at rest. A heart rate over 100 beats per minute characterizes tachycardia, indicating that the heart is beating faster than normal. This can occur due to various factors such as physical activity, stress, medical conditions, or physiological responses to stimuli.

Understanding this definition is crucial for medical professionals, as tachycardia can be a sign of underlying health issues that may require further assessment and intervention. Recognizing a heart rate above 100 beats per minute helps in identifying patients who may be at risk for complications related to conditions affecting cardiac function.