Which of the following describes bradycardia?

Bradycardia is defined as a slower than normal heart rate, specifically a heart rate that drops below 60 beats per minute (bpm). This condition can occur due to various factors, such as increased vagal tone, certain medications, or underlying health issues affecting the heart's electrical system.

Normal resting heart rates for adults range from 60 to 100 bpm; therefore, a heart rate falling below this threshold indicates bradycardia. It is important to recognize this condition because it can lead to symptoms such as fatigue, dizziness, and fainting, depending on how low the heart rate drops and whether the body is able to compensate for the reduced cardiac output.

In contrast, a heart rate exceeding 100 bpm is defined as tachycardia, which is not relevant in this case. A normal heart rhythm at rest indicates a heart rate within the standard range, and ineffective atrial contractions pertain to issues related to the heart's pumping efficiency and rhythm rather than a specific heart rate. Thus, understanding bradycardia is crucial for monitoring and managing heart health effectively.