Looking Deep Into the Palpitation – Pheochromocytoma Presenting as Sinus Node Dysfunction

A 23-year-old male came to the outpatient department with a history of intermittent palpitations and headaches for the past six to eight months. He was diagnosed with hypertension and had a junctional rhythm on an electrocardiogram (ECG). On further workup for his hypertension, he was found to have elevated levels of serum metanephrines and computed tomography (CT) and positron emission tomography (PET) scan revealed pheochromocytoma. He was subsequently operated upon and his arrhythmia subsided after surgery. We discuss our approach to this scenario, which leads us to a rather rare cause of sinus node dysfunction.