Use of a Continuous Glucose Monitor for Preoperative Monitoring and Treatment of Hypoglycemia in a Case of Pancreatic Neuroendocrine Tumor

ABSTRACT Objective Pancreatic neuroendocrine tumors secreting proinsulin and insulin could lead to life-threatening hypoglycemia. We aim to show this can be avoided by utilizing continuous glucose monitoring. Methods We describe a case of a 55-year-old female with hypoglycemia unawareness and seizures diagnosed with proinsulinoma. She utilized an intermittently scanned continuous glucose monitor (isCGM) to monitor hypoglycemia preoperatively. Results The patient underwent biochemical and radiographic evaluation to confirm the diagnosis of proinsulinoma. Utilizing isCGM to monitor blood glucose, she was able to prevent hypoglycemia-related seizures prior to definitive surgery. Conclusion In the time leading up to a definitive surgery, patients with proinsulinomas are at risk of hypoglycemic events leading to falls, seizures, and even death. isCGMs can be utilized for preoperative monitoring and treatment of hypoglycemia in these patients.