Objective: To describe a previously asymptomatic woman who developed a glucagon-induced pheochromocytoma crisis during preparation for screening colonoscopy.
Methods: We present the patient's clinical features, laboratory and imaging findings, and outcome and review the related literature.
Results: A 76-year-old woman received glucagon to inhibit intestinal motility before routine colonoscopy. She immediately developed severe hypertension, cardiac arrhythmia, and altered mental status. Her hospital course was complicated by encephalopathy and cardiac, respiratory, renal, and hepatic failure. Computed tomography of the abdomen showed a 6.5 × 4.8-cm mass in the left adrenal gland. Biochemical testing for pheochromocytoma revealed markedly elevated plasma catecholamines and metanephrines and urinary vanillylmandelic acid and metanephrine. She underwent a successful laparoscopic left adrenalectomy. Findings from histopathologic and immunohistochemical examination of the adrenal mass were diagnostic of pheochromocytoma.
Conclusions: Glucagon administration induced catecholamine release from an occult pheochromocytoma, which caused multiorgan injury. Health care providers using glucagon must consider this rare, but life-threatening, complication.