SUMMARY Neonatal diabetes mellitus (NDM) is a monogenic form of diabetes occurring mainly in the first 6 months of life. Approximately 30% of transient NDM (TNDM) cases will have an activating mutation in the KATP channel genes ABCC8 and KCNJ11. The majority of the patients with KCNJ11 mutations who are receiving insulin treatment can be transferred to treatment with sulfonylurea (SU), with an improvement in metabolic control and quality of life. Intermittent continuous glucose monitoring (iCGM) is used to assess the current and retrospective interstitial glucose, providing information such as hypo/hyperglycemia tendency and time on target. This case report describes the use of iCGM in the transition from insulin treatment to glibenclamide in a patient with TNDM caused by a pathogenic variant of KCNJ11. This is the first report of a successful outpatient transition from insulin to glibenclamide, in a Brazilian child with TNDM using iCGM (FreeStyle Libre@). The remote monitoring and online management allowed the patient to safely stay at home during the transition from insulin to SU, especially important in the context of the COVID-19 pandemic. We conclude that iCGM is a helpful tool in cases of NDM and should be used to increase safety and speed up dose adjustments in outpatient transition from insulin to glibenclamide.

CONTEXTO: O diabetes auto-imune do adulto, como originalmente escrito, representa 10 a 20% dos doentes diabéticos que iniciam a doença. TIPO DE ESTUDO: Relato de caso. RELATO DO CASO: Um índio de 38 anos, do grupo Xavante Jê, pertencente a comunidade de Sangradouro, Poxoréu, Mato-Grosso, Brasil, com Diabetes Auto-imune Latente do Adulto (LADA) é descrito. Início do quadro clínico de diabetes após os 25 anos, evolução para deficiência insulínica após um período de insulino-independência e presença de auto-anticorpos anti-GAD circulantes, características do LADA estão presentes. Esse é o primeiro caso de LADA descrito em populações indígenas. A extensão do estudo é necessária para verificar a prevalência desse novo tipo de diabetes nessa população que não possui componente genético caucasóide e apresenta condições ambientais próprias. Essa caracterização é importante para o diagnóstico, tratamento e prognóstico desses indivíduos.

CONTEXT: Latent autoimmune diabetes of the adult (LADA) as originally described represents perhaps as many as 10 -- 20% of adult-onset patients with diabetes. DESIGN: case report. CASE REPORT: A 38-year-old Brazilian Xavante-Jê Indian with Latent Autoimmune Diabetes of the Adult (LADA) is described, coming from the Sangradouro community in Poxoréu, Mato Grosso. The onset of diabetes after reaching 25 years of age, the evolution to insulin deficiency after a period of insulin-independence and the presence of auto-antibodies to glutamic acid decarboxylase (GAD) characteristic of LADA were present. This patient may represent the first case of LADA in a Brazilian with full Indian heritage. Further studies are necessary to verify the prevalence of this new type of diabetes in this population that does not have Caucasoid admixture and has a particular environmental background.