Extreme hypercalcemia secondary to parathyroid adenoma obscured by excessive coffee consumption and premature ventricular complexes.

Severe hypercalcemia has an arrhythmogenic effect. We present a case of a young male falsely diagnosed with premature ventricular complexes attributed to heavy coffee consumption, while symptoms and electrocardiographic findings of hypercalcemia were disregarded. Delayed work-up identified extreme hypercalcemia, and subsequently, parathyroid adenoma was diagnosed. Medical and surgical management resulted in complete resolution. The misdiagnosis led to a substantial diagnostic delay.