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      Effects of LDL apheresis and vitamin E-modified membrane on carotid atherosclerosis in hemodialyzed patients with arteriosclerosis obliterans.

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          Abstract

          Hemodialysis patients manifest accelerated atherosclerosis. Hemodialysis is associated with oxidative stress, which can be partially prevented with the use of a vitamin E-coated dialyzer. Adsorption of low-density lipoprotein (LDL) has been applied in the treatment of arteriosclerosis obliterans (ASO). The aim of the present study was to determine whether the vitamin E-coated dialyzer and/or LDL apheresis affects carotid atherosclerosis in hemodialysis patients with ASO.

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          Validity, reproducibility, and clinical significance of noninvasive brachial-ankle pulse wave velocity measurement.

          Akira Yamashina, Hirofumi Tomiyama, Kazuhiro Takeda … (2002)
          The present study was conducted to evaluate the validity and reproducibility of noninvasive brachial-ankle pulse wave velocity (baPWV) measurements and to examine the alteration of baPWV in patients with coronary artery disease (CAD). Simultaneous recordings of baPWV by a simple, noninvasive method and aortic pulse wave velosity (PWV) using a catheter tip with pressure manometer were performed in 41 patients with CAD, vasospastic angina, or cardiomyopathy. In 32 subjects (15 controls and 17 patients with CAD), baPWV was recorded independently by two observers in a random manner. In 55 subjects (14 controls and 41 patients with CAD), baPWV was recorded twice by a single observer on different days. baPWV were compared among 172 patients with CAD (aged 62 +/- 8 years); 655 age-matched patients without CAD but with hypertension, diabetes mellitus, or dyslipidemia; and 595 age-matched healthy subjects without these risk factors. baPWV correlated well with aortic PWV (r=0.87, p<0.01). Pearson's correlation coefficients of interobserver and intraobserver reproducibility were r=0.98 and r=0.87, respectively. The corresponding coefficients of variation were 8.4% and 10.0%. baPWV were significantly higher in CAD patients than in non-CAD patients with risk factors, for both genders (p<0.01). In addition, baPWV were higher in non-CAD patients with risk factors than in healthy subjects without risk factors. Thus, the validity and reproducibility of baPWV measurements are considerably high, and this method seems to be an acceptable marker reflecting vascular damages. baPWV measured by this simple, noninvasive method is suitable for screening vascular damages in a large population.
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            Iron therapy, advanced oxidation protein products, and carotid artery intima-media thickness in end-stage renal disease.

            Béatrice Descamps-Latscha, Ziad Massy, Valérie Gausson … (2002)
            Increased common carotid artery intima-media thickness (CCA-IMT) is a marker of early atherosclerosis. Low-grade inflammation is associated with the pathogenesis of atherosclerosis. Low-grade inflammation and increased CCA-IMT are observed in end-stage renal disease (ESRD). Oxidative stress is involved in uremia-related inflammation. Advanced oxidation protein products (AOPP) are markers of oxidant-mediated protein damage in ESRD. Intravenous iron given to patients on hemodialysis (HD) might induce oxidative stress. We investigated the relationships between AOPP, iron therapy, and CCA-IMT in stable HD patients. Plasma AOPP and blood chemistry, including iron status, were analyzed in a cohort of 79 ESRD patients on HD. Measurements of CCA-IMT and CCA diameter, as assessed by B-mode ultrasonography, were obtained in 60 patients. AOPP levels were elevated in ESRD patients, and in univariate (r=0.42, P<0.0001) and multivariate analyses (r=0.38, P<0.001), they correlated with serum ferritin and with the intravenous iron dose received during the 12 months preceding the study (ferritin, P<0001; AOPP, P<0.01). Univariate and multivariate analyses identified the AOPP concentration as being significantly associated with CCA-IMT (P=0.0197) and CCA wall-to-lumen ratio (r=0.560, P<0.0001). Independently of AOPP concentration, cumulative iron dose was positively related to CCA-IMT (P=0.015) in patients <60 years. In ESRD patients, CCA-IMT and CCA wall-to-lumen ratio were associated with plasma AOPP, serum ferritin, and the annual intravenous iron dose administered. These findings support the concept of a role of oxidative stress in the early atherosclerosis of ESRD patients, which may be increased by the usually recommended doses of intravenous iron.
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              Advanced atherosclerosis in predialysis patients with chronic renal failure.

              Hideki Tahara, Tsutomu Tabata, Masanori Emoto … (2002)
              Atherosclerosis is advanced in hemodialysis patients as shown by increased intima-media thickness of carotid arteries (CA-IMT), although it is not established whether the advanced atherosclerosis results from hemodialysis treatment or from chronic renal failure. The purpose of this study was to evaluate the effects of hemodialysis and renal failure on CA-IMT in patients with chronic renal failure. CA-IMT was measured by high-resolution B-mode ultrasonography in 110 patients with chronic renal failure before starting dialysis (CRF group), and compared with CA-IMT of 345 hemodialysis patients (HD group) and 302 healthy control subjects. They were all nondiabetic and the three groups were comparable in age and gender. As compared with the healthy control subjects, the CRF and HD groups had greater CA-IMTs, whereas CA-IMTs of the CRF and HD groups were not statistically different. There was no significant correlation between duration of hemodialysis and CA-IMT in the HD group. Multiple regression analysis in the total subjects indicated that presence of renal failure, but not being treated with hemodialysis, was a significant factor associated with increased CA-IMT independent of age, gender, blood pressure, smoking, high-density lipoprotein (HDL) and non-HDL cholesterol levels. These results demonstrate that thickening of arterial wall is present in patients with chronic renal failure before starting hemodialysis treatment, and support the concept that advanced atherosclerosis in hemodialysis patients is due not to hemodialysis treatment, but to renal failure and/or metabolic abnormalities secondary to renal failure.
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                Author and article information

                Journal
                Journal ID (iso-abbrev): Kidney Blood Press. Res.
                Title: Kidney & blood pressure research
                Publisher: S. Karger AG
                ISSN: 1420-4096
                ISSN (Print): 1420-4096
                Publication date (Electronic): 2003
                Volume: 26
                Issue: 3
                Affiliations
                [1 ] Department of Medicine, Shinmatsudo Central General Hospital, Chiba, Japan.
                Article
                Publisher Item ID: 71884
                DOI: 10.1159/000071884
                PubMed ID: 12886046
                SO-VID: 15e6a205-639c-4718-a10d-bc519b6c9230
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