What is the medical definition of 'bradycardia'?

Bradycardia is defined as a slow heart rate, specifically one that falls below 60 beats per minute (bpm). This physiological condition can occur as a normal variation, particularly in athletes or during sleep, but it can also indicate underlying health issues or be a response to certain medications. The threshold of less than 60 bpm is crucial in diagnosing bradycardia, as heart rates above this range are considered normal or even elevated, depending on the context. Understanding this definition is important for recognizing potential cardiac complications and determining appropriate medical intervention when necessary.