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Introduction Secondary monotherapy failure in diabetes mellitus type 2 occurs early in the course of disease. Choosing the optimal combination therapy depends on the primary pathogenic mechanism. Evaluation of the residual beta cell function is of primary importance in deciding whether insulin should be included in the combination therapy. Objective To investigate the influence of standard meal test and homeostasis model assessment (HOMA-B) index, as markers of residual insulin secretion, on the efficacy of two different therapeutic strategies in secondary sulphonylurea (SU) failure. Methods In the group of thirty subjects with diabetes type 2, metabolic syndrome and secondary SU failure, metformin (MET) was added for the following six months. In the group of 30 subjects with diabetes type 2, secondary SU failure, with no metabolic syndrome, insulin (INS) was added for the same period. During the six-month follow-up period, fasting, postprandial, mean daily blood glucose and glycosylated haemoglobin (HbA1C) were evaluated. Fasting and meal stimulated C-peptide (CP) and insulin levels were measured at the beginning; absolute and relative increase of CP (delta CP, delta CP%), and HOMA-B were calculated. Correlation between CP secretion and HOMA-B at the beginning and glycaemic control after six months of therapy were evaluated by using Pearson correlation coefficient. Results Glycaemic control after six months was significantly improved in both therapeutic combinations (p |
