Final answer:
The prefix 'Brady' in the word 'bradycardia' signifies a slow condition, which in the context of this term relates to a heart rate slower than the normal range, specifically below 60 beats per minute in adults.
Step-by-step explanation:
The part of the word "bradycardia" that tells you it means a deficient or slow heartbeat is Brady. The prefix 'brady-' means slow, and the suffix '-cardia' refers to the heart. Therefore, bradycardia refers to a slower than normal heart rate, typically defined as a heart rate below 60 beats per minute in adults.
Arrhythmia includes conditions where the heartbeat is irregular, with bradycardia being a type of arrhythmia. Symptoms of bradycardia can vary from none to serious ones, like lightheadedness or chest pain. Treatments often depend on the underlying cause of bradycardia and can range from medication adjustments to the implementation of a pacemaker.