Which term describes an abnormal force or rhythm of the heart?

• A. Tachycardia
• B. Bradycardia
• C. Arrhythmia
• D. Myocardial infarction

Answer: (C)

An arrhythmia describes any abnormal heart rhythm or irregular contraction strength caused by disruptions in the heart’s electrical signaling. This means the heartbeat can be too fast, too slow, or irregular in rhythm, capturing the broad idea of an abnormal rhythm or force. Tachycardia and bradycardia are specific patterns—fast and slow heart rates, respectively—so they don’t convey the full concept as well as arrhythmia does. Myocardial infarction is a heart attack from blocked blood flow and isn’t a description of rhythm or contraction pattern. In rehab, recognizing arrhythmias during activity is important because some require medical evaluation or adjustments to exercise.