What is bradycardia?

Bradycardia is defined as a heart rate that is less than 60 beats per minute. This condition can be a normal finding in well-trained athletes or during sleep, but it may also indicate underlying health issues, particularly if it results in symptoms such as fatigue, dizziness, or fainting. Understanding bradycardia is crucial as it may signal a vagal response or electrical conduction issues in the heart, requiring further assessment and possibly intervention. The other choices describe varying heart rate ranges that do not align with the clinical definition of bradycardia, making the selection of the correct answer essential for accurate knowledge of cardiac health indicators.