Final answer:
Bradycardia is a condition where the resting heart rate drops below 60 bpm. It can be caused by various factors such as abnormalities in the SA or AV node or diseases of the heart vessels or valves. Treatment depends on the underlying cause.
Step-by-step explanation:
Bradycardia is a condition where the resting heart rate drops below 60 beats per minute (bpm), which is lower than the normal range of 60-100 bpm for adults. It is characterized by a slower heart rate but does not necessarily indicate a problem if there are no other symptoms present. Bradycardia can be caused by factors such as abnormalities in the SA or AV node, diseases of the heart vessels or valves, metabolic disorders, or neurological disorders. Treatment depends on the underlying cause and may include medication or a pacemaker.