title: Tissue characteristics of restenosis after percutaneous transluminal coronary angioplasty in diabetic patients.
abstract: OBJECTIVE
  The purposes of this study were to analyze coronary specimens from patients with diabetes mellitus (DM) and to compare them with specimens from patients without DM.
  
  
  BACKGROUND
  Diabetes mellitus is associated with an increased incidence of restenosis after percutaneous transluminal coronary angioplasty (PTCA). Increased hypercellular smooth muscle cell proliferation with exaggerated intimal hyperplasia formation may be responsible for this predisposition.
  
  
  METHODS
  Eighteen coronary atherectomy specimens with restenosis after PTCA from patients with DM were compared with 18 coronary atherectomy specimens with restenosis after PTCA from patients without DM. Total and segmental areas were quantified on trichrome-stained tissue of hypercellular tissue, collagen-rich sclerotic tissue, atheroma and thrombus. Demographic and angiographic data were similar in both groups.
  
  
  RESULTS
  The percentage of total plaque area composed of hypercellular tissue was lower in restenotic specimens from patients with DM than in restenotic specimens from patients without DM (19 +/- 6% vs. 44 +/- 5%; p = 0.003). The percentage of collagen-rich sclerotic tissue area was larger in restenotic specimens from patients with DM than in restenotic specimens from patients without DM (77 +/- 9% vs. 53 +/- 4%; p = 0.004). The percentages of atheroma and thrombus were similar in both groups.
  
  
  CONCLUSIONS
  Intimal hypercellular tissue content is reduced in restenotic tissue from patients with DM. Collagen-rich sclerotic content is increased in restenotic lesions from patients with DM. These results suggest an accelerated fibrotic rather than a proliferative response in diabetic lesions from patients with restenosis after PTCA.
authors.affiliation: Gill Heart Institute, University of Kentucky, Lexington, USA. pmoreno@pop.uky.edu
authors.forename: P R
authors.initials: PR
authors.lastname: Moreno
authors.forename: J T
authors.initials: JT
authors.lastname: Fallon
authors.forename: A M
authors.initials: AM
authors.lastname: Murcia
authors.forename: M N
authors.initials: MN
authors.lastname: Leon
authors.forename: H
authors.initials: H
authors.lastname: Simosa
authors.forename: V
authors.initials: V
authors.lastname: Fuster
authors.forename: I F
authors.initials: IF
authors.lastname: Palacios
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D017225:Atherectomy, Coronary; D002455:Cell Division / Q000502:physiology; D003324:Coronary Artery Disease / Q000473:pathology* / Q000628:therapy; D003328:Coronary Thrombosis / Q000473:pathology; D003925:Diabetic Angiopathies / Q000473:pathology* / Q000628:therapy; D005260:Female; D005352:Fibromuscular Dysplasia / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009131:Muscle, Smooth, Vascular / Q000473:pathology; D012008:Recurrence; D019233:Retreatment; D012307:Risk Factors; D017539:Tunica Intima / Q000473:pathology