Pheochromocytoma and sinus node dysfunction.

Pheochromocytomas are rare catecholamine-producing neuroendocrine tumors that can lead to detrimental outcomes; if identified and treated, they are associated with a good prognosis. The clinical presentation can vary greatly but is classically associated with tachycardia, headaches, and hypertension. Bradyarrhythmias and sinus node dysfunction are uncommon complications of this condition. We present a case of pheochromocytoma associated with sinus pauses and junctional escape rhythms that had complete resolution of sinus node dysfunction after adrenalectomy.