Abstract
Atypical ketosis-prone diabetes (KPD) is frequently detected in obese individuals at diagnosis of diabetes, yet its precise pathophysiology is not understood. The hypothesis tested in this study states that while individuals with atypical KPD are phenotypically similar to those with type 2 diabetes, metabolically, they behave more like individuals with autoimmune type 1 diabetes. Thirty-seven individuals of Black, Hispanic, or White background and a diagnosis of diabetes mellitus for an average duration of 4 years participated in this cross-sectional study. Ten, 12, and 15 subjects had type 1, atypical, and type 2 diabetes, respectively. Insulin secretion was evaluated by a mixed-meal test. Insulin sensitivity and fuel oxidation were assessed by simultaneous euglycemic hyperinsulinemic clamp and indirect calorimetry. Lastly, a 12-h insulin withdrawal test was performed. Insulin secretion, insulin sensitivity, and the insulin withdrawal tests yielded significant differences for type 1 vs. atypical diabetes and type 1 vs. type 2 diabetes, while there were no significant differences between atypical vs. type 2 diabetes. The indirect calorimetry showed higher-than-normal basal nonprotein respiratory quotients (RQs) and lower-than-n...Continue Reading
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