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Bradyarrhythmias can be caused by a number of systemic factors, with hypoxia, hypothyroidism, and hyperkalemia being key contributors.

Hypoxia refers to a deficiency in the amount of oxygen reaching the tissues, which can disrupt normal electrical conduction in the heart and lead to bradyarrhythmias. When the heart isn't receiving adequate oxygen, its ability to maintain a normal rhythm can be compromised.

Hypothyroidism, characterized by low levels of thyroid hormone, can also significantly reduce the heart rate. The thyroid hormones play an important role in modulating metabolism and heart function, and their deficiency can slow down the heart rate, potentially leading to bradyarrhythmias.

Hyperkalemia, which is an elevated level of potassium in the blood, is known to have a direct effect on cardiac conduction. High potassium levels can interfere with the electrical signals in the heart, resulting in slowed conduction and potentially bradyarrhythmias.

These three systemic causes (hypoxia, hypothyroidism, and hyperkalemia) act through distinct physiological mechanisms to lead to a decreased heart rate, making them critical considerations in the management of patients presenting with bradyarrhythmias.