Objective We present the case of a 66-year-old woman who developed hypoglycemia following the prolonged infiltration of a high dose continuous peripheral intravenous insulin infusion. Study Selection Case report. Data Synthesis The patient was post-lung transplantation and was receiving high doses of glucocorticoids. Despite increasing the peripheral intravenous insulin rate, hyperglycemia persisted. We discovered that the intravenous insulin infusion line infiltrated, resulting in a large subcutaneous insulin depot, estimated to be 450 units of regular insulin. She subsequently experienced prolonged hypoglycemia that was managed with concentrated dextrose containing fluids. In our literature search, there were no similar case reports. The literature on insulin overdose, usually from suicide attempts, can help guide the management of iatrogenic hyperinsulinemic hypoglycemia. Important management considerations include anticipated duration of hypoglycemia, supplemental glucose, fluid management, and electrolyte monitoring. Conclusion Peripheral intravenous insulin infusion infiltration should be considered when patients do not respond to increasing rates of insulin infusion.
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