Kelly is exhibiting neuromuscular irritability, tetany (tingling noted around the mouth and in her feet), dry skin and fingernails, more prone to cavities (you suspect weak tooth enamel), and complaining of irregular heartbeats. An EKG is run and cardiac dysrhythmias are noted. Her blood work is normal, except for hypocalcemia is noted, what disorder could this be

Summarized question: What causes cardiac dysrhythmia while having hypocalcemia?