title: [Variations of beta-cell early-phase insulin secretion in type 2 diabetic patients in different stages].
abstract: OBJECTIVE
  To explore the variations of early-phase insulin secretion in Type 2 diabetic patients in different stages.
  
  
  METHODS
  L-arginine stimulative test, fast blood glucose and body mass index (BMI) were evaluated in 40 nomal controls (NC) and 101 Type 2 diabetic patients. The diabetic patients were divided into three groups: newly diagnosed group (n = 35), effectively treated by sulfonylureas group (n = 32) , and secondary failure of sulfonylureas group (n = 34). The indexs of insulin resistance of homeostasis model assessment (HOMA-IR), beta-cell insulin secretion of homeostasis model assessment (HOMA-IS), and the acute insulin response (AIRARG) index were calculated. Some statistical comparisons were done among the 4 groups.
  
  
  RESULTS
  The indexs of HOMA-IR in each group of Type 2 diabetic patients were all higher than those in NC group (P < 0.01). The AIRARG indexs were obviously lower in Type 2 diabetic patients in different stages than those in NC group (P < 0.01), and the subsequence from the highest to the lowest among the groups of diabetic patients was: the newly diagnosed group, the effectively treated by sulfonylureas group, and the secondary failure of sulfonylureas group (P < 0.01). But there was no significant difference in indexs of HOMA-IS between the newly diagnosed group and the effectively treated by sulfonylureas group.
  
  
  CONCLUSIONS
  There is severe insulin resistance in Type 2 diabetic patients in each stage. The variations of early-phase insulin secretion manifest a vary procedure of obvious deterioration by degrees from the newly diagnosed group to the secondary failure of sulfonylureas group in Type 2 diabetic patients.
authors.affiliation: Department of Endocrinology, Xiangya Hospital, Central South University, Changsha, China.
authors.forename: Hui-ju
authors.initials: HJ
authors.lastname: Zhong
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.forename: Lan
authors.initials: L
authors.lastname: Liao
authors.forename: Hui-ling
authors.initials: HL
authors.lastname: Chen
authors.forename: Li-juan
authors.initials: LJ
authors.lastname: Guo
mesh_terms: D000328:Adult; D003924:Diabetes Mellitus, Type 2 / Q000188:drug therapy / Q000378:metabolism*; D005260:Female; D006801:Humans; D007328:Insulin / Q000378:metabolism*; D007333:Insulin Resistance; D000078790:Insulin Secretion; D050417:Insulin-Secreting Cells / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D013453:Sulfonylurea Compounds / Q000627:therapeutic use; D013997:Time Factors
chemical_list: D007328:Insulin; D013453:Sulfonylurea Compounds