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Severe hypocalcemia can significantly impact the cardiovascular system, leading to the potential for life-threatening complications. One of the most critical risks associated with low calcium levels in the blood is cardiac arrest. Calcium plays an essential role in the electrical activity of the heart, including the contraction of heart muscles and the regulation of heart rhythms. When calcium levels drop too low, it can lead to disturbances in the heart's conduction system, resulting in arrhythmias or even complete cessation of heart function, known as cardiac arrest.

In addition to cardiac arrest, severe hypocalcemia can also produce a range of other symptoms and complications, but they generally do not carry the same immediate life-threatening risk. Conditions like persistent headache, hypotension, and inflammation, while they may occur in various situations, are not typical direct complications of severe hypocalcemia. Instead, cardiac arrest stands out as a severe and acute risk that requires immediate medical attention. Thus, the link between hypocalcemia and its effect on heart function solidifies the understanding of why this complication is recognized as particularly serious.