Reversal of hypercalcemia-induced complete heart block (CHB) with parathyroidectomy

Complete heart block (CHB) is a rare complication particularly associated with primary hyperparathyroidism (PHPT). In this case report, we discuss the successful management of a 61-year-old male patient who was referred to the institute with symptomatic CHB attributed to PHPT. The patient was admitted to the center with high levels of serum calcium and parathyroid hormone (PTH). After stabilizing the patient's condition, he underwent parathyroidectomy surgery. There was an adenoma in the patient's lower left parathyroid gland, and a left lower parathyroidectomy was performed. There was also a large calcified nodule in the left lip of the thyroid, which was successfully removed. Postoperative follow-up showed improvement of CHB, modification of serum calcium levels, and PTH concentrations returned to normal. This case emphasizes the importance of timely recognition and management in patients with PHPT; early intervention in these patients can significantly improve treatment outcomes and prevent arrhythmia-related complications.