title: Effect of pravastatin on low-density lipoprotein oxidation and myocardial perfusion in young adults with type 1 diabetes.
abstract: OBJECTIVE
  Diabetes has been associated with increased oxidative stress and impaired vascular function. Statins have been shown to reduce low-density lipoprotein (LDL) oxidizability and improve myocardial perfusion in hypercholesterolemic nondiabetic subjects. We studied whether pravastatin decreases LDL oxidation and improves myocardial perfusion in normocholesterolemic subjects with type 1 diabetes.
  
  
  RESULTS
  In this randomized, double-blind study, myocardial perfusion was measured at rest and during dipyridamole stimulation with positron emission tomography and [15O]H2O during hyperinsulinemic euglycemia in 42 patients (age 30+/-6 years; LDL cholesterol 2.48+/-0.57 mmol/L) before and after 4-month treatment with pravastatin 40 mg/d or placebo. In addition, 12 healthy nondiabetic subjects were studied. LDL oxidation was measured by determining the level of baseline diene conjugation in lipids extracted from LDL. The level of LDL oxidation was similar in the pravastatin and placebo groups before treatment (23.9+/-4.6 versus 25.6+/-9.5 micromol/L, respectively) and decreased significantly during pravastatin treatment to 19.5+/-5.0 micromol/L (P<0.005). Myocardial perfusion reserve was significantly lower in diabetic patients compared with controls (4.15+/-1.29 versus 5.31+/-1.86, P<0.05) and did not change after treatment. Glycemic control and insulin sensitivity remained unchanged during treatment.
  
  
  CONCLUSIONS
  Pravastatin treatment, resulting in decreased LDL oxidation, did not improve myocardial perfusion reserve in subjects with type 1 diabetes.
authors.affiliation: Turku PET Centre, Turku University Central Hospital, PO Box 52, FIN-20521 Turku, Finland. tuula.janatuinen@pet.tyks.fi
authors.forename: Tuula
authors.initials: T
authors.lastname: Janatuinen
authors.forename: Juhani
authors.initials: J
authors.lastname: Knuuti
authors.forename: Jyri O
authors.initials: JO
authors.lastname: Toikka
authors.forename: Markku
authors.initials: M
authors.lastname: Ahotupa
authors.forename: Pirjo
authors.initials: P
authors.lastname: Nuutila
authors.forename: Tapani
authors.initials: T
authors.lastname: Rönnemaa
authors.forename: Olli T
authors.initials: OT
authors.lastname: Raitakari
mesh_terms: D000328:Adult; D003326:Coronary Circulation / Q000187:drug effects*; D003922:Diabetes Mellitus, Type 1 / Q000097:blood*; D003925:Diabetic Angiopathies / Q000473:pathology; D004176:Dipyridamole / Q000494:pharmacology; D004311:Double-Blind Method; D005260:Female; D015309:Glucose Clamp Technique; D006321:Heart / Q000000981:diagnostic imaging*; D006439:Hemodynamics; D006801:Humans; D006946:Hyperinsulinism / Q000097:blood; D008077:Lipoproteins, LDL / Q000097:blood*; D008297:Male; D010084:Oxidation-Reduction; D049268:Positron-Emission Tomography; D017035:Pravastatin / Q000494:pharmacology / Q000627:therapeutic use*; D012171:Retinal Vessels / Q000473:pathology
chemical_list: D008077:Lipoproteins, LDL; C099252:oxidized low density lipoprotein; D004176:Dipyridamole; D017035:Pravastatin