Rheumatology Advance Access originally published online on October 25, 2009
Rheumatology 2009 48(12):1606-1612; doi:10.1093/rheumatology/kep305
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Arterial stiffness and cumulative inflammatory burden in rheumatoid arthritis: a dose–response relationship independent of established cardiovascular risk factors
1Institute of Applied Health Sciences, Aberdeen University Medical School, Aberdeen, 2Department of Rheumatology, Ninewells Hospital, Dundee, 3Department of Clinical Pharmacology and 4Department of Rheumatology, Aberdeen Royal Infirmary, Aberdeen, UK.
Correspondence to: Michael A. Crilly, Institute of Applied Health Sciences, Section of Population Health, Aberdeen University Medical School, Polwarth Building at Foresterhill, Aberdeen AB25 2ZD, UK. E-mail: mike.crilly{at}abdn.ac.uk
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Objective. To quantify the relationship between arterial stiffness and cumulative inflammatory burden in patients with RA.
Methods. We recruited RA patients without overt arterial disease aged 40–65 years, attending hospital rheumatology outpatient clinics. Standardized research nurse assessment included blood pressure (BP), pulse wave analysis (PWA, SphygmoCor), BMI, fasting blood sample (lipids, glucose, RF and ESR), patient questionnaire (smoking, alcohol, diet, exercise, family history of premature coronary heart disease and Stanford HAQ), current medication and medical record review. Cumulative inflammatory burden was measured as ESR area-under-the-curve (ESR-years) extracted from medical records. Arterial stiffness was measured using PWA [aortic augmentation index (AIX@75)]. Multiple linear regression was used to adjust for age, sex and nine other cardiovascular risk factors.
Results. We recruited 114 RA patients (mean age 54 years, female 81%, current DMARD 90%, current NSAID 70%, ACR criteria 56%) comprising 1040 RA person-years. Cholesterol, glucose and BMI were similar in women and men. Women had a longer duration of arthritis (10 vs 7 years) and were more likely to be seropositive (85 vs 71%). BP, smoking and alcohol consumption were lower for women. On fully adjusted analysis, an increase of 100 ESR-years was associated with an increase in AIX@75 of 0.51 (95% CI 0.13, 0.88). On fully adjusted analysis restricted to women the increase was 0.43 (95% CI 0.01, 0.85).
Conclusions. In RA patients free of overt arterial disease, a dose–response relationship exists between cumulative inflammatory burden and arterial stiffness. This relationship is independent of established CV risk factors.
KEY WORDS: RA, Inflammation, Pulse wave analysis, Arterial stiffness, Augmentation index, Cardiovascular risk factors
Submitted 17 April 2009;
revised version accepted 14 August 2009.
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