COVID-19-Induced Diabetic Ketoacidosis in an Adult with Latent Autoimmune Diabetes.

Latent autoimmune diabetes in adults (LADA) is a type of slow-onset, immune-mediated insulin deficiency involving progressive destruction of beta-cell function. Despite sharing some similarities with both type 1 and type 2 diabetes, LADA is a separate entity that should be given equal attention as patients with this condition are subject to severe complications and preventable hospitalizations without proper medical management if not diagnosed in a timely manner. Herein, we describe the case of a 45-year-old Hispanic female with a past medical history of presumed noninsulin-dependent type 2 diabetes managed with metformin for six years who presented with fatigue, dry cough, and intermittent presyncope for one week. Laboratory data revealed evidence of diabetic ketoacidosis. She also tested positive for coronavirus disease 2019 (COVID-19) caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Although her respiratory status was stable and did not require treatment for COVID-19, she required high doses of insulin to normalize hyperglycemia and spent two days in the intensive care unit (ICU). Further evaluation revealed positive islet autoantibodies and decreased C-peptide levels, leading to a diagnosis of LADA. SARS-CoV-2 has been shown to enter islet cells via the angiotensin-converting enzyme-2 (ACE2), causing damage and inducing acute diabetes and associated complications, including ketoacidosis. It is conceivable that this patient had acute worsening of her diabetes through this mechanism. Recognition of this association may contribute to the timely diagnosis of LADA and prevention of medical complications due to inappropriate diabetes therapy.