What is bradycardia?

• A. An abnormally high resting heart rate, typically above 100 beats per minute
• B. An abnormally low resting heart rate, typically below 60 beats per minute
• C. A resting heart rate that is within the normal range
• D. A rapid heart rate during physical activity

Answer: (B)

Bradycardia refers to a condition where the heart rate is abnormally low, typically defined as being below 60 beats per minute when a person is at rest. This condition can occur in various situations, including during sleep, in well-trained athletes, or as a result of certain medical conditions affecting the heart's electrical system.

The significance of bradycardia lies in its potential effects on cardiovascular function, as a heart rate below the normal range may lead to inadequate blood flow to the body's organs and tissues. Symptoms can include fatigue, dizziness, or fainting, particularly if the heart rate drops too low. Understanding bradycardia is crucial for recognizing when an individual may need medical evaluation or intervention, particularly in scenarios where it is symptomatic.

In contrast, the other options describe different heart rate conditions that do not align with the definition of bradycardia. For example, an abnormally high resting heart rate refers to tachycardia, and a normal resting heart rate falls within a range of roughly 60-100 beats per minute. A rapid heart rate during physical activity does not relate to bradycardia, as it typically implies an increased heart rate in response to exertion, which is expected in healthy individuals.