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  • Title: Inflammation is associated with carotid atherosclerosis in dialysis patients. Creed Investigators. Cardiovascular Risk Extended Evaluation in Dialysis Patients.
    Author: Zoccali C, Benedetto FA, Mallamaci F, Tripepi G, Fermo I, Focà A, Paroni R, Malatino LS.
    Journal: J Hypertens; 2000 Sep; 18(9):1207-13. PubMed ID: 10994751.
    Abstract:
    OBJECTIVE: To investigate the relationship between inflammatory processes and atherosclerosis in uraemic patients on chronic dialysis. DESIGN: A cross-sectional study in 138 dialysis patients (92 on haemodialysis and 46 on continuous ambulatory peritoneal dialysis). METHODS: Serum C-reactive protein (CRP), IgG anti-Chlamydia pneumoniae antibodies, lipoprotein (a), fibrinogen and plasma homocysteine as well as the intima-media thickness and the number of atherosclerotic plaques of the carotid arteries (by Echo-Colour-Doppler) were measured in each patient RESULTS: One hundred and eight patients had at least one plaque and 26 had more than six plaques. Serum CRP was above the upper limit of the normal range (5 mg/I) in 85 of 138 patients (62%). IgG anti-Chlamydia pneumoniae antibodies were detectable in 64% of patients (high level in 24%, intermediate in 33% and low in 7%) and undetectable in the remaining 36% of patients. In a multiple regression model age (beta=0.35), serum CRP (beta=0.23), plasma homocysteine (beta=0.19), duration of dialysis (beta=0.19) and pulse pressure (beta=0.18) were independent predictors of intima-media thickness (R=0.54, P < 0.0001). Similarly, age (beta=0.33), serum CRP (beta=0.29), plasma homocysteine (beta=0.20) and serum albumin (beta=-0.18) were independent correlates of the number of atherosclerotic plaques (R = 0.55, P < 0.0001 ). Furthermore, in smokers, the interaction serum CRP-IgG anti-Chlamydia pneumoniae antibodies was the stronger independent predictor (beta=0.43, P=0.0001) of the number of atherosclerotic plaques while no such relationship (P=0.73) was found in non-smokers. CONCLUSIONS: In patients on chronic dialysis treatment CRP is independently associated to carotid atherosclerosis and appears at least in part to be explained by IgG anti-Chlamydia pneumoniae antibodies level. These data lend support to the hypothesis that inflammation plays a role in the pathogenesis of atherosclerosis in these patients.
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