Journal List > J Rheum Dis > v.20(4) > 1064050

Yeo, Lee, Lee, Byun, Im, and Kim: Microvascular Findings in Patients with Rheumatoid Arthritis - Assessed, Using Fundus Photography and Fluorescein Angiography

Abstract

Objective

Although a series of trials support that rheumatoid arthritis (RA) is associated with increased atherosclerosis, the link between microvascular structural changes and the disease activity of RA has not been clarified. We measured changes in the retinal micro-vasculature using fundus fluorescein angiography (FAG) and investigated the association between the retinal vasculature and clinical parameters of RA.

Methods

Seventy-five RA patients and sixty healthy control were included. Morphometric and quantitative features in the capillary images including retinal vascular signs and vessel diameters were measured with fundus photography and FAG. RA activity was assessed based on high sensitivity C-reactive protein (hsCRP), disease activity score with 28 joints (DAS 28), and health assessment questionnaire (HAQ).

Results

Central retinal arteriolar equivalents (CRAE) was 118.1±31.3 μm in RA patients and 123.8±19.9 μm in control subjects, showing the tendency of retinal arteriolar narrowing in patients with RA but without statistical significance. The mean central retinal venular equivalents (CRVE) was 162.4±26.4 μm which was significantly higher than that of control group (144.1±23.1 μm, p<0.001). The prevalence of AVN was 34.7%, and significantly higher in RA group. Among retinal findings, the presence of early pinpoint hyperfluorescence and areas of delayed choroidal perfusion correlated with hsCRP. Age, disease duration, DAS 28, HAQ, and rheumatoid factor (RF) had no effect on CRAE and CRVE. In multivariate analysis, only hsCRP was found to be associated with wider venular caliber.

Conclusion

Retinal venular widening was more common in RA patients. Retinal venular diameter had significant correlation with disease activity of RA. Retinal imaging is a comparative method for the assessment of microvascular findings of RA patients.

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Table 1.
Clinical characteristics and parameters of the retinal vascular changes of the study population
  RA patients (n=75) Control (n=60) p
Age, yrs 53.1±11.6 52.1±12.0 0.63
Female, n 64 (85%) 51 (85%) 0.99
BMI, kg/m2 22.6±6.4 22.5±8.5 0.87
Disease duration, yrs 2.8±2.6    
Systolic blood pressure, mmHg 125.3±11.9 122.3±8.9 0.18
Diastolic blood pressure, mmHg 81.6±11.3 80.4±7.8 0.25
Total cholesterol, mg/dL 198.2±29.7 186.7±22.3 0.23
HsCRP, mmol/L 9.6±12.3    
DAS-28 2.6±1.2    
CRAE, μm 118.1±31.3 123.8±19.9 0.23
CRVE, μm 162.4±26.4 144.1±23.1 <0.001
AVR 0.70±0.08 0.69±0.08 0.68
AVN, n (mild/severe) 26 (21/5) 8 (7/1) 0.02
FAN, n (mild/severe) 13 (9/4) 9 (8/1) 0.53
OAW, n (mild/severe) 28 (21/7) 19 (19/0) 0.31
Fluorescein angiography features, n      
Early pinpoint hyperfluorescence 13 (17%) 2 (3%) 0.01
Areas of delayed choroidal perfusion 3 (4%) 2 (3%) 0.07
Pinpoint peripapillary hyperfluorescence 3 (4%) 0 (0%) 0.17
Disc leakage 3 (4%) 0 (0%) 0.19
Late pooling of fluorescein 2 (3%) 0 (0%) 0.31
Disc hyperfluorescence 1 (1%) 0 (0%) 0.56
Late choroidal hyperfluorescence 1 (1%) 0 (0%) 0.56

RA: rheumatoid arthritis, BMI: body mass index, CRAE: Central retinal arteriolar equivalents, CRVE: Central retinal venular equivalents, AVR: arteriole-to-venule ratio, AVN: arteriovenous nicking, FAN: focal arteriolar narrowing, OAW: opacification of the arteriolar wall.

Table 2.
Characteristics of RA patients with and without AVN
  RA patients with AVN (n=26) RA patients without AVN (n=49) p
Age, yrs 56.8±13.2 51.0±10.3 0.04
Disease duration, yrs 3.36±3.31 2.45±2.06 0.22
hsCRP mmol/L 12.44±15.23 10.6±12.72 0.58
Rheumatoid factor, IU/mL 70.72±72.62 71.86±101.60 0.96
DAS 28 2.86±1.34 2.52±1.18 0.26
HAQ 0.51±0.99 0.43±0.58 0.31

All values are presented as mean± SD. RA: rheumatoid arthritis, AVN: arteriovenous nicking, hsCRP: high sensitivity C-reactive protein, DAS 28: disease activity score (28 joints analyzed), HAQ: health assessment questionnaire.

Table 3.
Correlation coefficients (p-value) between the parameters of retinal vascular diameter and clinical parameters of RA group (n=75)
  CRAE CRVE
Age 0.021 (0.81) 0.037 (0.67)
Duration 0.036 (0.76) −0.021 (0.86)
hsCRP 0.328 (0.15) 0.438 (<0.001)
Rheumatoid factor 0.159 (0.18) 0.178 (0.13)
DAS 28 −0.027 (0.82) −0.062 (0.60)
HAQ 0.158 (0.18) 0.138 (0.24)

RA: rheumatoid arthritis, CRAE: central retinal arteriolar equivalents, CRVE: Central retinal venular equivalents, hsCRP: high sensitivity C-reactive protein, DAS 28: disease activity score with 28 joints, HAQ: health assessment questionnaire.

Table 4.
Correlation coefficients between FFA features and clinical parameters of RA group (n=75)
  Early pinpoint hyperfluorescence Areas of delayed choroidal perfusion Pinpoint peripapillary hyperfluorescence Disc leakage Late pooling of fluorescein Disc hyperfluorescence Late choroidal hyperfluorescence
Age 0.201 (0.053) 0.194 (0.095) 0.058 (0.621) 0.111 (0.342) 0.136 (0.246) 0.050 (0.971) 0.090 (0.441)
Duration −0.053 (0.651) −0.115 (0.331) −0.034 (0.773) −0.088 (0.457) −0.115 (0.330) −0.103 (0.383) −0.049 (0.676)
hsCRP 0.341 (0.003) 0.257 (0.027) 0.099 (0.399) 0.184 (0.117) 0.272 (0.019) 0.196 (0.094) 0.006 (0.958)
Rheumatoid factor 0.037 (0.754) 0.069 (0.562) 0.065 (0.579) 0.005 (0.968) 0.080 (0.490) 0.075 (0.527) 0.145 (0.219)
DAS 28 0.046 (0.700) 0.312 (0.070) 0.022 (0.852) 0.058 (0.648) 0.086 (0.468) 0.035 (0.767) 0.192 (0.101)
HAQ 0.176 (0.134) 0.145 (0.219) 0.094 (0.423) 0.006 (0.963) 0.167 (0.156) 0.030 (0.080) 0.167 (0.156)

FFA: fundus fluorescent angiography, RA: rheumatoid arthritis, hsCRP: high sensitivity C-reactive protein, DAS 28: Disease Activity Score with 28 joints, HAQ: Health Assessment Questionnaire.

Table 5.
Multiple linear regression analysis of CRVE and parameters of arterial stiffness of common carotid artery in RA groups CRVE (R2=0.245, adjusted R2=0.177 in multivariate analysis)
  Univariate analysis Multivariate analysis
Coefficient (β) 95% CI p R2 Coefficient (β) 95% CI p
Age 0.077 −0.358 to 0.706 0.516 0.006 0.005 −0.497 to 0.518 0.967
Disease duration −0,021 −2.629 to 2.195 0.858 −0.013 0.004 −2.289 to 2.363 0.975
hsCRP 0.438 0.443 to 1.265 <0.001 0.181 0.456 0.411 to 1.366 <0.001
Rheumatoid factor 0.178 −0.015 to 0.117 0.130 0.018 0.198 −0.005 to 0.118 0.070
DAS 28 −0.062 −6.324 to 3.665 0.597 −0.010 −0.136 −8.357 to 2.577 0.295
HAQ 0.138 −3.234 to 12.582 0.243 0.005 0.008 −9.305 to 9.881 0.952

RA: rheumatoid arthritis, CRVE: Central retinal venular equivalents, hsCRP: high sensitivity C-reactive protein, DAS 28: Disease Activity Score with 28 joints, HAQ: Health Assessment Questionnaire.

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