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Case Report: Early-onset euglycemic diabetic ketoacidosis following henagliflozin initiation in a treatment-naive patient

Cai J, Fu T, Tan C

Frontiers in endocrinology, 2026

Abstract

Background: Sodium-glucose cotransporter 2 (SGLT2) inhibitors are associated with euglycemic diabetic ketoacidosis (euDKA), typically occurring after ≥2 weeks of therapy in the setting of intercurrent illness or surgical stress. The risk of early-onset euDKA in treatment-naive patients-those without prior glucose-lowering therapy or established metabolic stability-remains poorly characterized. We describe a case of severe euDKA occurring within 4 days of SGLT2 inhibitor initiation, precipitated solely by metformin-induced gastrointestinal adverse effects.

Case presentation: A 40-year-old woman with newly diagnosed type 2 diabetes (HbA1c 12.9%) was initiated on metformin, henagliflozin (SGLT2 inhibitor), and chiglitazar. Within 24 hours, she developed nausea and vomiting attributed to metformin intolerance. Despite progressive symptoms and minimal oral intake over 72 hours, she continued all medications without seeking medical care. On day 4, she presented with severe high-anion-gap metabolic acidosis (pH 7.043, bicarbonate 6.5 mmol/L), ketonemia (β-hydroxybutyrate 5.6 mmol/L), and plasma glucose 8.5 mmol/L-consistent with euDKA. Management included intravenous dextrose, insulin infusion, and fluid resuscitation, with resolution by day 3. The patient was discharged on basal insulin, metformin, and chiglitazar (SGLT2 inhibitor discontinued), with no recurrence at 4-week follow-up.

Conclusion: In treatment-naive patients initiating SGLT2 inhibitor-based combination therapy,…

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