Final answer:
Cardiac arrhythmias, tachycardia, and bradycardia all contribute to heart rhythm abnormalities.
Step-by-step explanation:
The presence of cardiac arrhythmias, tachycardia, and/or bradycardia all play a role in heart rhythm abnormalities. Arrhythmia, also known as cardiac arrhythmia or heart arrhythmia, is a group of conditions in which the heartbeat is irregular, too fast, or too slow. Tachycardia is defined as a heart rate above 100 beats per minute in adults, while bradycardia is defined as a heart rate below 60 beats per minute.