Final answer:
A slow pulse is called bradycardia, which is a condition where the heart rate is below 60 bpm. Treatment may involve a pacemaker if the condition is serious and coupled with other symptoms.
Step-by-step explanation:
A slow pulse is known as bradycardia. It is a condition where the resting heart rate (HR) is below 60 beats per minute (bpm) in adults. This can be contrasted with tachycardia, where the heart rate is more than 100 bpm. While arrhythmia is a broad term that includes both too fast and too slow heart rates, bradycardia specifically refers to the slower rates. Some arrhythmias have no symptoms, but bradycardia can be serious if linked with symptoms like lightheadedness or passing out. In such cases, treatment may involve addressing underlying causes or even using a pacemaker to normalize heart rhythm.