What is a common symptom associated with paroxysmal arrhythmias?

Paroxysmal arrhythmias are characterized by their intermittent nature, with episodes that start and stop suddenly. The common symptom associated with these arrhythmias is sudden episodes of palpitations, which can feel like the heart is racing, fluttering, or beating irregularly. These episodes may last from seconds to hours and typically resolve on their own.

The nature of paroxysmal arrhythmias - experiencing sudden onset and cessation - aligns closely with the symptom of palpitations, making it the most relevant choice. Recognizing this symptom is crucial for diagnosis and management, as it prompts healthcare providers to investigate the underlying cause of the arrhythmia.

Other symptoms like consistent dizziness and constant fatigue can occur with various cardiovascular conditions but are not specific indicators of paroxysmal arrhythmias. Stable heart rates, on the other hand, would not be expected in the context of paroxysmal arrhythmias, which inherently involve periods of abnormal heart rhythms. Thus, the symptom of sudden episodes of palpitations is directly connected to the nature of paroxysmal arrhythmias.