Which term describes a heart rhythm that is not regular or normal?

• A. Regular
• B. Irregular
• C. Arrhythmic
• D. Stable

Answer: (B)

The term that describes a heart rhythm that is not regular or normal is "irregular." An irregular heart rhythm indicates that the timing of the heartbeats is inconsistent, which can be due to various factors or underlying health conditions.

In contrast, a regular heart rhythm would mean that the intervals between heartbeats are consistent, which is typically observed in a healthy cardiovascular system. "Arrhythmic" could also be associated with abnormal rhythms, but it is not as commonly used in clinical terminology as "irregular." The term "stable" usually refers to a condition in which the heart rhythm does not experience significant fluctuations, reinforcing the idea of normalcy rather than irregularity. Thus, calling a rhythm "irregular" directly captures the essence of what it means for the heartbeats to be inconsistent or abnormal in their pattern.