Use of Concentrated Insulin in the Management of Calcium Channel Blocker Overdose: A Case Report

Introduction Hyperinsulinemia-euglycemia therapy [HIE] is a first line therapy recommended in symptomatic calcium channel blocker overdose patients. HIE, particularly if administered in concentrations typically used for glycemic control, would result in a substantial amount of hypotonic fluid administration, which places patients at risk of volume overload. Therefore, it may be beneficial to utilize a concentrated insulin as a strategy to mitigate fluid overload risks. We report the case of a 73 years old, 69.9 kg female, who presented to the emergency department after an accidental ingestion of 70 mg amlodipine and was treated with HIE utilizing a uniquely concentrated insulin infusion. Case Presentation HIE at 10 units/kg/hr. was used for approximately 17 hours. Insulin was changed from a 1 unit/mL concentration to 16 unit/mL. Dextrose 10% infusion was initiated up to a max of 650 mL/hr. and norepinephrine infusion up to a max of 10 mcg/min. Discussion Approximate fluid requirements from the 16 unit/mL concentration of insulin totaled 1 L as compared to a 1 unit/mL concentration which would have required 17 L, a total savings of 16 L. This savings potentially decreased the risk of cerebral or pulmonary edema associated with fluid overload. Conclusion Use of a concentrated insulin in the setting of a calcium channel blocker or beta blocker overdose provides a unique strategy to mitigate the effects associated with fluid overload.