title: Uncontrolled type 1 diabetes mellitus and endothelial dysfunction in adolescents.
abstract: BACKGROUND
  Diabetes mellitus is associated with microvascular and macrovascular diseases, potentially manifested as endothelial dysfunction. In adults with type 2 diabetes the haptoglobin genotype 1-1 has been shown to have a protective role in inhibiting the development of complications. Although complications from type 1 diabetes are infrequent during childhood, endothelial dysfunction, which is an early marker of vascular complications, may occur.
  
  
  OBJECTIVE
  To evaluate endothelial function in adolescents with type 1 diabetes before the development of complications and to test for potential relationships between endothelial dysfunction and haptoglobin genotype.
  
  
  METHODS
  The study group comprised 15 adolescents with type 1 diabetes. All underwent a general physical examination, diabetes control evaluation (including HbA1c levels), endothelial function assessment and haptoglobin genotype determination.
  
  
  RESULTS
  There was a significant negative correlation between HbA1c levels and endothelial function (r = -0.48, P < 0.05), and HbA1c was significantly higher in patients with endothelial dysfunction than in those with normal endothelial function (9.9 +/- 2.2 vs. 7.7 +/- 1.0 mg/dl, P < 0.05). In addition, there was a tendency toward a positive correlation between high density lipoprotein and endothelial function (r = 0.4, P < 0.1). There was no correlation between the haptoglobin genotype and endothelial function.
  
  
  CONCLUSIONS
  These results show that even in patients without complications, uncontrolled type 1 diabetes is associated with endothelial dysfunction, which may lead to microvascular complications in the future.
authors.affiliation: Department of Pediatrics A, Meyer Children's Hospital, Rambam Medical Center, Haifa, Israel.
authors.forename: Yael
authors.initials: Y
authors.lastname: Shachor-Meyouhas
authors.forename: Giora
authors.initials: G
authors.lastname: Pillar
authors.forename: Naim
authors.initials: N
authors.lastname: Shehadeh
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000503:physiopathology*; D004730:Endothelium, Vascular / Q000503:physiopathology*; D005260:Female; D005838:Genotype; D006442:Glycated Hemoglobin / Q000032:analysis; D006242:Haptoglobins / Q000032:analysis / Q000235:genetics; D006801:Humans; D008075:Lipoproteins, HDL / Q000097:blood; D008297:Male
chemical_list: D006442:Glycated Hemoglobin; D006242:Haptoglobins; D008075:Lipoproteins, HDL