What heart rate characterizes Sinus Bradycardia?

Sinus bradycardia is defined by a heart rate that is less than 60 beats per minute. This condition originates from the sinus node, which is the natural pacemaker of the heart. The sinus node generates electrical impulses at a rate that is too slow for normal physiological function, resulting in a reduced heart rate. While it can be seen in healthy individuals, especially athletes with good cardiovascular fitness, it becomes clinically significant when it is associated with symptoms such as dizziness, fatigue, or syncope.

Understanding the normal heart rate range is crucial. A heart rate of 60 to 100 beats per minute is considered normal for adults, while rates above this may indicate tachycardia. Additionally, heart rates between 100-150 beats per minute and rates above 150 beats per minute indicate different physiological conditions that are not related to bradycardia. Thus, recognizing the specific threshold of less than 60 beats per minute is essential for identifying sinus bradycardia and managing it appropriately in a clinical setting.