Journal List > J Rheum Dis > v.21(3) > 1064106

Park, Lee, Park, Lee, Baek, Hwang, Kim, Park, Kim, and Choi: Association between Vitamin D Deficiency and Carotid Intima-media Thickness in Patients with Rheumatoid Arthritis

Abstract

Objective

The present study determined if vitamin D deficiency is a potential risk factor for increased carotid in-tima-media thickness (CIMT) in patients with rheumatoid arthritis (RA).

Methods

This cross-sectional study analyzed 50 consecutive female RA patients without cardiovascular disease history at the Pusan National University Hospital between September and December of 2013. CIMT was measured using a high-resolution ultrasonography. Serum 25-hydroxy vitamin D (25-OHD) levels were assessed by radioimmuno-assay, and vitamin D deficiency was defined as serum 25-OHD levels <20 ng/mL. Stepwise multivariable linear regression analyses were performed to evaluate the association between vitamin D deficiency and increased CIMT. Results. The median 25-OHD level (interquartile range) was 14.0 (11.0∼20.7) ng/mL, and 74% of patients had vitamin D deficiency. The mean± standard deviation of CIMT was 0.58±0.08 mm. RA patients with vitamin D deficiency had significantly higher CIMT than those without this feature (0.59±0.07 vs 0.54±0.05, p=0.028). In univariable linear regression models, vitamin D deficiency (β(SE)=0.047 (0.021), p=0.028), older age (β(SE)=0.003 (7.2-4), p<0.001) and higher disease activity score 28-erythrocyte sedimentation rate (β(SE)=0.021 (0.010), p=0.034) and Korean version of health assessment questionnaire score (β(SE)=0.051 (0.015), p=0.002) were significantly associated with increased CIMT. Vitamin D deficiency remained statistically significant in multivariable regression models after adjusting for confounders.

Conclusion

Vitamin D deficiency was associated with increased CIMT in female RA patients. Our finding suggests that hypovitaminosis D can be a risk factor for atherosclerosis in RA patients.

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Table 1.
Baseline demographics of 50 female patients with rheumatoid arthritis
Variables Total (n=50) Vitamin D deficiency (n=37) No vitamin D deficiency (n=13) p-value
Age, years, mean± SD 56.0±11.2 56.0±11.2 56.0±11.2 0.547
Disease duration, months, median (IQR) 50 (26.5∼100) 55 (29.5∼104.5) 59 (28∼83) 0.991
RF positive, n (%) 36 (87.8%) 26 (86.7%) 10 (90.9%) 1.00
Anti-CCP antibody positive, n (%) 36 (92.3%) 27 (90.0%) 9 (100%) 1.00
ESR, mm/hr, median (IQR) 17 (7∼17) 18.5 (7∼40.8) 17 (9∼26.5) 0.928
CRP, mg/dL, median (IQR) 0.08 (0.02∼0.18) 0.08 (0.23∼0.02) 0.08 (0.03∼0.14) 0.883
DAS28-ESR, mean± SD 2.72±0.98 2.77±1.06 2.63±0.78 0.683
K-HAQ, median (IQR) 0.38 (0∼0.91) 0.25 (0∼1.1) 0.38 (0∼0.75) 0.911
Current medication        
 GCs, n (%) 46 (92)      
 Cumulative GCs, g, median (IQR) 3.4 (1.0∼7.7)      
 Methotrexate, n (%) 39 (78)      
 Hydroxychlorouqine, n (%) 18 (36)      
 Sulfasalazine, n (%) 7 (14)      
 Leflunomide, n (%) 8 (16)      
 TNF-α inhibitors, n (%) 1 (2)      
25-OHD, ng/mL, median (IQR) 14.0 (11.2∼20.7)      
Vitamin D deficiency, n (%) 37 (74%)      

IQR: interquartile range, RF: rheumatoid factor, Anti-CCP antibody: Anticitrullinated protein antibody, ESR: erythrocyte sedimentation rate, CRP: C-reactive protein, DAS28: disease activity score 28, GCs: glucocorticoids, K-HAQ: Korean Version of health assessment questionnaire, TNF-α: tumor necrosis factor-alpha, 25-OHD: 25-hydroxy vitamin D.

Table 2.
Cardiovascular risk factors in study subjects
Variables Total (n=50) Vitamin D deficiency (n=37) No vitamin D deficiency (n=13) p-value
BMI, kg/m2, mean± SD 23.1±3.2 23.1±2.9 23.1±3.9 0.994
WHR, mean± SD 0.85±0.06 0.84±0.05 0.88±0.08 0.039
Smoker, n (%) 3 (6%) 1 (2.7%) 2 (15.3%) 0.162
HTN, n (%) SBP, mmHg, mean± SD 18 (36%)126.8±16.1 12 (32.4%)126.0±14.6 6 (46.2%)129.2±20.3 0.5040.532
DBP, mmHg, mean± SD 76.4±12.1 75.1±11.2 80.3±14.1 0.182
Dyslipidemia, n (%) 7 (14%) 5 (13.5%) 2 (15.4%) 1.000
LDL-C, mg/dL, mean± SD 115.1±34.7 114.0±32.5 118.0±41.6 0.755
TG, mg/dL, mean± SD 105.6±59.7 105.0±65.7 107.2±40.5 0.909
HDL-C, mg/dL, mean± SD 70.1±18.4 69.6±18.4 71.6±19.0 0.733
Type 2 DM, n (%) 6 (12%) 6 (16.2%) 0 (0%) 0.319
Fasting glucose, mg/dL, mean± SD 90.8±10.3 91.5±11.3 88.9±6.4 0.453
Fasting insulin, μ IU/mL, median (IQR) 5.3 (4.4∼7.8) 5.1 (4.0∼7.9) 6.5 (5.1∼7.7) 0.179
HOMA-IR, median (IQR) 1.13 (0.97∼1.73) 1.10 (0.93∼1.78) 1.42 (1.03∼1.69) 0.301
CIMT, mm, mean± SD 0.58±0.08 0.59±0.07 0.54±0.05 0.028
CIMT ≥0.6 mm, n (%) 24 (48%) 22 (59.5%) 2 (15.4%) 0.009
Carotid plague, n (%) 3 (6%) 2 (5.4%) 1 (7.7%) 1.000

BMI: body mass index, WHR: waist-to-hip ratio, HTN: hypertension, SBP: systolic blood pressure, DBP: diastolic blood pressure, LDL-C: low density lipoprotein cholesterol, TG: triglycerides, HDL-C: high density lipoprotein cholesterol, DM: diabetes mellitus, IQR: interquartile range HOMA-IR: homeostatic model assessment-insulin resistance, CIMT: carotid intima-media thickness.

Table 3.
Linear regression models for carotid intima media thickness in study subjects
  Univariable analysis
Model 1*
Model 2
  β (SE) p-value β (SE) p-value β (SE) p-value
Age, years 0.003 (7.2-4) <0.001 0.003 (6.9-4) <0.001 0.003 (6.6-4) <0.001
Vitamin D deficiency 0.047 (0.021) 0.028 0.044 (0.017) 0.014 0.041 (0.016) 0.017
BMI, kg/m2 0.005 (0.003) 0.106 0.005 (0.002) 0.032 0.006 (0.002) 0.016
Disease duration, months 1.6-4 (1.6-4) 0.318        
HDL-C, mg/dL −0.001 (5.2-4) 0.054        
DAS28-ESR 0.021 (0.010) 0.034        
K-HAQ 0.051 (0.015) 0.002     0.044 (0.015) 0.005
      Adjusted R2*=0.421 Adjusted R2=0.550

BMI: body mass index, HDL-C: high density lipoprotein cholesterol, DAS28: disease activity score 28, ESR: erythrocyte sedimentation rate, K-HAQ: Korean Version of health assessment questionnaire.

* Model 1 includes age, vitamin D deficiency, BMI, disease duration, HLD-C and DAS28-ESR.

Model 2 includes age, vitamin D deficiency, BMI, disease duration, HLD-C and K-HAQ.

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