Which of the following can be a potential cause of cardiac dysrhythmias?

Acid-base disturbances can significantly affect the electrical activity of the heart, leading to cardiac dysrhythmias. The balance of acids and bases in the blood is critical for proper cellular function, including that of cardiac myocytes (heart muscle cells). When there is an imbalance, such as acidosis or alkalosis, it can disrupt the normal ion channels and lead to altered depolarization and repolarization patterns in the heart. These alterations can trigger premature contractions or other dysrhythmias.

While bacterial infections can cause systemic inflammatory responses that impact heart rhythm, and high blood pressure can put strain on heart structures and function, it is the specific disruption of the acid-base balance that most directly affects the electrical conduction system of the heart. Fitness level, while it can influence overall cardiovascular health and could potentially impact heart rhythm, is less directly related to causing dysrhythmias when compared to acid-base disturbances.