Which of the following defines bradycardia?

Bradycardia is defined as a slower than normal heart rate, specifically a heart rate that is less than 60 beats per minute (bpm) in adults. This condition can occur for various reasons, including physiological factors such as increased vagal tone, certain medications, or pathological conditions such as heart block or hypothyroidism. In a clinical context, knowing that bradycardia presents with a heart rate below 60 bpm helps healthcare providers assess a patient's cardiovascular health and determine if any interventions are necessary.

Understanding the ranges of heart rates is crucial for distinguishing between normal and abnormal findings. Normal resting heart rates for adults typically range from 60 to 100 bpm, while rates greater than 100 bpm indicate tachycardia. Recognizing these definitions allows nurses and healthcare professionals to accurately monitor and respond to patients' vital signs.