THU385 Refractory Hyperglycemia As Main Presenting Symptom In A Patient With Acromegaly

Disclosure: T. Rave: None. J. Vidovic: None. Y. Gu: None. Acromegaly is a rare disorder caused by the overproduction of growth hormone (GH) from an anterior pituitary adenoma. GH regulates glucose control and about 10% of patients with acromegaly can have complications of hyperglycemia. GH stimulates hepatic release of insulin-like growth hormone-1 (IGF-1), which increases gluconeogenesis and lipolysis and decreases glucose uptake throughout the body. The increase in gluconeogenesis and decrease in glucose uptake results in hyperglycemia. The excess release of fatty acids increases insulin resistance. In this case report we present a case of hyperglycemia resistant to multiple modes of medical management with limited acromegaly features found to have acromegaly induced hyperglycemia. A 58-year-old male with a past medical history of type II diabetes mellitus, hypertension, and obesity presented to the endocrinology clinic with treatment resistant hyperglycemia. The patient also endorsed having progressive carpal tunnel symptoms. He had been using an insulin pump and requiring 3 or more boluses per day for the last 6 months. Trulicity was added in addition to current insulin pump therapy, however, sugars remained elevated with an unimproved A1c level of 9% and a fructosamine level of 538 µmol/L correlating to an A1c of 10.8%. An IGF-1 level was sent to rule out acromegaly in the setting of carpal tunnel symptoms. The IGF-1 resulted in 580 ng/mL with a z-score of +5.1. The patient underwent a GH suppression test with a glucose load which showed a significantly elevated nadir GH level of 26.3 ng/mL. Of note, the patient did not have other acromegaly symptoms such as frontal bossing, ring or shoe enlargement, coarse facial features, headaches or vision changes. An MRI pituitary was obtained which was notable for an enlarged pituitary gland with heterogeneous signal, measuring approximately 2.0cm CC x 1.5cm AP x 1.7cm TV, with the pituitary stalk deviated to the left. At this time the intervention for hyperglycemic therapy shifted. The patient was started on octreotide and referred to neurosurgery for transsphenoidal surgery. The pathophysiology of type II diabetes is complex and multifaceted. Additionally, secondary causes of hyperglycemia must be considered in refractory cases, such as in this patient. This case highlights the importance of considering acromegaly and other hormonal conditions in the treatment of patients with uncontrolled hyperglycemia, even in otherwise asymptomatic patients. Presentation: Thursday, June 15, 2023