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An arrhythmia refers to an abnormal heart rhythm, which can manifest as a heart beating too fast, too slow, or irregularly. The heart's electrical impulses may not function properly, leading to variations in the heartbeat that can affect its efficiency in pumping blood. This can result in symptoms such as palpitations, dizziness, or in severe cases, fainting. Importantly, understanding arrhythmias is crucial for patient care technicians, as they can play a significant role in monitoring and managing these conditions as part of patient assessments and care plans.