Albuminuria in Rheumatoid Arthritis: Associations With Rheumatoid Arthritis Characteristics and Subclinical Atherosclerosis |
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| Authors: | Amanda Sammut Steven Shea Roger S. Blumenthal Moyses Szklo Joan M. Bathon Joseph F. Polak Russell Tracy Jon T. Giles |
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| Affiliation: | 1. Columbia University College of Physicians & Surgeons, New York, New York;2. Johns Hopkins University, Baltimore, Maryland;3. Tufts University School of Medicine, Boston, Massachusetts;4. University of Vermont College of Medicine, Burlington, Vermont |
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| Abstract: | Objective Albuminuria is a marker for subclinical cardiovascular disease (CVD ) in the general population. It is uncertain whether this association is present in patients with rheumatoid arthritis (RA ), a population with increased atherosclerosis and CVD events. Methods Urine albumin from a spot morning collection was measured, and the urine albumin‐to‐creatinine ratio (uACR ) was calculated for RA patients and a population‐based sample of demographically matched non‐RA controls. Associations of elevated uACR (≥25 mg/gm for women and ≥17 mg/gm for men) with CVD risk factors and measures of atherosclerosis (coronary artery calcification, ultrasound‐determined maximal intima‐media thickness of the common carotid artery and internal carotid artery [ICA ], and the presence of focal plaque in the ICA ) were compared cross‐sectionally according to RA status. Results We compared 196 RA patients with 271 non‐RA controls. Elevated uACR was found in 18% of the RA patients compared with 17% of the controls (P = 0.89). After adjustment, RA was associated with 57% lower odds of elevated uACR (P = 0.016). Higher serum creatinine levels and hypertension were both strongly and significantly associated with elevated uACR in the control group but not in the RA group (both P for interaction < 0.05). Among RA characteristics, the adjusted prevalence of elevated uACR among those treated with tumor necrosis factor inhibitors was less than half that among those not so treated (9% versus 20%, respectively; P = 0.047). Conclusion There was no association in the RA group of elevated uACR with measures of atherosclerosis or with several key cardiometabolic risk factors, which suggests a lower usefulness of elevated uACR as an indicator of subclinical CVD in RA. |
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