Which factor is NOT typically listed as a potential cause of cardiac dysrhythmias?

High physical fitness is not typically listed as a potential cause of cardiac dysrhythmias because regular physical activity and fitness are generally associated with improved cardiovascular health. In fact, individuals who are physically fit often have a stronger cardiovascular system, which can lead to more efficient heart rhythms rather than arrhythmias. It's important to note that while extreme physical exertion in certain populations, such as athletes, can occasionally lead to abnormalities in heart rhythm, being physically fit itself is typically not a direct cause of dysrhythmias.

On the other hand, trauma, electrolyte imbalances, and CNS damage can all create conditions that disturb the heart's electrical activity. Trauma can lead to direct injury to the heart or surrounding structures, electrolyte imbalances can disrupt electrical conduction, and central nervous system damage can affect the autonomic regulation of the heart.