Calcium imbalance represents a critical but often overlooked risk factor for life-threatening heart rhythm disorders. When blood calcium levels deviate from the normal range of 8.5–10.5 mg/dL, the consequences extend far beyond bone health. Low calcium levels trigger QT-interval prolongation on electrocardiograms, creating a substrate for dangerous arrhythmias, while elevated calcium can precipitate atrial fibrillation and other cardiac conduction abnormalities.
These dangerous conditions stem from failures in the parathyroid-vitamin D-kidney regulatory axis, a three-component system responsible for maintaining calcium homeostasis. Disruptions at any point—whether from vitamin D deficiency, kidney disease, hormonal dysfunction, or malignancy—can rapidly destabilize cardiac electrolyte balance. Healthcare providers emphasize the importance of recognizing warning signs including muscle spasms, palpitations, and neurological symptoms, which may indicate underlying calcium dysregulation requiring immediate investigation and management.
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