Development and validation of a Behçet's Disease Damage Index for adults with BD: An Explicit, Composite and Rated (ECR) tool

Validation of the Behçet's Syndrome Overall Damage Index (BODI) for retrospective studies and a proposal for modification

OBJECTIVE

Assessment of damage accrual over time is important for evaluating and comparing long-term results of treatment modalities and strategies. Retrospective studies may be useful for assessing long-term damage, especially in rare diseases. We aimed to validate Behçet's Syndrome Overall Damage Index (BODI) for use in retrospective studies by evaluating its construct validity, reliability and feasibility in retrospectively collected data. Additionally, we aimed to determine missing items by evaluating Behçet's syndrome patients with different types of organ involvement and long-term follow-up.

METHODS

We included 300 patients who had at least two clinic visits at 1-year intervals. The construct validity for use in retrospective trials was assessed by comparing BODI scores calculated from patient charts and during face-to-face visits. BODI was additionally scored using retrospective chart data by two different observers and by the same observer six months apart, in a blinded manner. The time for filling BODI was evaluated to assess feasibility. Additionally, damaged items that were missing from BODI were identified.

RESULTS

There was a good correlation between the retrospective and face-to-face evaluation of BODI (ICC 0.99; %95 CI 0.99-0.99). Inter-observer and intra-observer agreement were good (ICC 0.96 and 1, respectively). The main damage items that BODI did not capture were hypertension, liver failure, lung parenchymal involvement, glaucoma and lymphedema.

CONCLUSION

BODI seems to be a reliable and feasible instrument for assessing damage in retrospective studies. Modifying BODI using the additional damage items identified in this study may make it an even better scale.

Organ damage is a major determinant of work productivity impairment in Behçet's syndrome: a post hoc analysis of the BODI validation study

OBJECTIVES

To evaluate the prevalence, magnitude and potential determinants of work productivity impairment in patients with Behçet's syndrome (BS), focusing on the role of irreversible organ damage.

METHODS

A post hoc analysis of the BS Overall Damage Index (BODI) prospective validation study was performed. Demographics and clinical features were recorded in all patients. The Work Productivity and Activity Impairment: General Health (WPAI:GH) questionnaire was administered to assess the work limitation and the BODI to measure organ damage. The independent effect of BS features on WPAI:GH outcomes was evaluated by regression analysis.

RESULTS

Of 148 patients, 34.5% were unemployed, with age [odds ratio (OR) 1.035] and BODI score (OR 1.313 for a 1-unit increase) as the only factors significantly (P < 0.05) associated with the unemployment state. Overall work impairment was reported in ≈64.2% of the employed patients. Indeed, 22.7% reported missing work hours due to their health (absenteeism), with a mean time loss of 34.4%, whereas 60.2% declared reduced performance at work because of their health (presenteeism), with a mean productivity impairment of 45.4%. Ocular damage was associated with absenteeism (β = 0.225); female sex (β = 0.260), physician global assessment of disease activity (β = 0.502) and an increased BODI score (β = 0.166 for 1-point increase) with presenteeism; and fibromyalgia (β = 0.246), Physician Global Assessment (β = 0.469) and musculoskeletal damage (β = 0.325) with overall work impairment.

CONCLUSIONS

Disease activity and organ damage accrual remarkably affect work productivity in BS patients. Achieving remission and preventing damage accrual are crucial and complementary objectives.

Ocular Damage Index, Ocular Pain and Subjective Visual Rating in Patients with Behçet's Uveitis: A Study of Impact on Health-Related Quality of Life

PURPOSE

The aim of our study is to assess subjective disease burden parameters (SVR and OP) as well as objective ones (BCVA and ODI) as predictors of HRQoL in Egyptian patients with BD uveitis.

METHODS

Ninety-six patients with BD uveitis were recruited in this cross-sectional study from the Rheumatology Department, Cairo University Hospital. HRQoL was assessed using RAND-36 item health survey 1.0, subjective visual rating (SVR) was measured on a 6-point Likert scale. Ocular pain (OP) was rated on a numeric rating scale. The Ocular Damage Index (ODI) was calculated using the ocular domain of the BD damage index. Linear regression was performed to determine predictors of HRQoL metrics.

RESULTS

SVR predicted Vitality (β = 0.15, p = 0.004), Emotional Well-being (EW) (β = 0.13, p = 0.005), General Health (β = 0.18, p = 0.012) and Mental Component Summary (β = 0.22, p = 0.002). OP predicted Social Function (β = -3.18 p < 0.001), General Health (β = -1.55, p = 0.004), Physical Component Summary (β = -2.00, p = 0.007) and Mental Component Summary (β = -1.53, p = 0.005). BCVA predicted Physical Function (β = 31.1, p = 0.02) and Emotional Well-being (β = 7.94, p = 0.01). ODI failed to predict any HRQoL metrics. ODI was independent predictor of legal blindness adjusted for uveitis duration and severity. Legally blind patients had worse HRQoL metrics than patients with better vision.

CONCLUSION

In BD uveitis patients, subjective disease burden parameters were more informative about HRQoL metrics than objective ones. Longitudinal studies are needed to elucidate the utility of ODI as an outcome measure in BD uveitis.

PRECIS

In Behcet's uveitis patients, health-related quality of life was related to visual outcome, ocular pain, and subjective visual rating. Ocular damage was an independent predictor of legal blindness, adjusted for uveitis duration and severity.

Damage accrual in Behçet disease: Behçet's Syndrome Overall Damage Index (BODI) versus Behçet's Disease Damage Index (BDI)

OBJECTIVES

To assess the validity of Behçet's Syndrome Overall Damage Index (BODI) and Behçet's Disease Damage Index (BDI) as tools for the detection of damage accrual in Behçet's patients compared to Vasculitis Damage Index (VDI). Also, to evaluate the correlation and the interclass correlation among the 3 indices to find out their consistency.

METHOD

A prospective cohort study was carried out on 102 adult Behçet's disease (BD) patients who were diagnosed according to the International Study Group criteria for BD. Disease severity and organ damage were assessed for each patient by VDI, BDI and BODI at baseline and 1-year follow-up visits. Damage accrual for each index was defined when there was an increase of at least 1 point (∆ ≥ 1) among the baseline and the follow-up visits.

RESULTS

Correlations among the 3 indices were significant, with (r = 0.835, P < 0.001) between VDI and BODI, (r = 0.835, P < 0.001) between VDI and BDI, and (r = 0.844, P < 0.001) between BODI and BDI scores. A highly significant positive correlation existed between the 3 indices and age and disease duration. In contrast, the correlation with the BD Current Activity Form was non-significant, which indicates good discriminative validity of the 3 indices. Neuropsychiatric and ocular systems showed a strong interclass correlation among the 3 indices. Regarding detecting damage accrual, BDI was more sensitive than BODI and showed more agreement with VDI.

CONCLUSION

BD damage indices, VDI, BODI and BDI, had good convergent and discriminative validity for the assessment of BD damage. BDI had more sensitivity than BODI to the detection of damage accrual.

Outcome measures in Behçet syndrome

Disease assessment has been challenging in Behçet syndrome due to the heterogeneous disease course and multiorgan involvement with variable treatment response. There have been several recent improvements regarding outcome measures including development of a Core Set of Domains for Behçet syndrome and novel instruments for assessing specific organs and overall damage. This review focuses on the current state of outcome measures in Behçet syndrome, unmet needs, and a research agenda towards the development of standardized and validated outcome measure instruments.

Development of machine learning models for detection of vision threatening Behçet's disease (BD) using Egyptian College of Rheumatology (ECR)-BD cohort

BACKGROUND

Eye lesions, occur in nearly half of patients with Behçet's Disease (BD), can lead to irreversible damage and vision loss; however, limited studies are available on identifying risk factors for the development of vision-threatening BD (VTBD). Using an Egyptian college of rheumatology (ECR)-BD, a national cohort of BD patients, we examined the performance of machine-learning (ML) models in predicting VTBD compared to logistic regression (LR) analysis. We identified the risk factors for the development of VTBD.

METHODS

Patients with complete ocular data were included. VTBD was determined by the presence of any retinal disease, optic nerve involvement, or occurrence of blindness. Various ML-models were developed and examined for VTBD prediction. The Shapley additive explanation value was used for the interpretability of the predictors.

RESULTS

A total of 1094 BD patients [71.5% were men, mean ± SD age 36.1 ± 10 years] were included. 549 (50.2%) individuals had VTBD. Extreme Gradient Boosting was the best-performing ML model (AUROC 0.85, 95% CI 0.81, 0.90) compared with logistic regression (AUROC 0.64, 95%CI 0.58, 0.71). Higher disease activity, thrombocytosis, ever smoking, and daily steroid dose were the top factors associated with VTBD.

CONCLUSIONS

Using information obtained in the clinical settings, the Extreme Gradient Boosting identified patients at higher risk of VTBD better than the conventional statistical method. Further longitudinal studies to evaluate the clinical utility of the proposed prediction model are needed.

Treat to target in Behcet's disease: Should we follow the paradigm of other systemic rheumatic diseases?

During the last decades the efficacy of biologic agents, mainly of anti-TNFs, in controlling the activity of serious manifestations of Behcet's Disease (BD) has been established. On the other hand, the clinical heterogeneity of BD has precluded the validation of a widely-accepted composite index for disease assessment and for target disease-state definitions, such as low disease activity and remission, and the testing of their implementation in clinical practice. Therefore, in contrast to other systemic rheumatic diseases, a treat-to-target strategy has not yet been developed in BD. There are several challenges towards this approach, including standardization of outcome measures for assessing the disease activity in each-affected organ and construction of a composite disease activity index. The challenges for the development of a treat-to-target strategy and possible solutions are discussed in this position paper, which stemmed from a round table discussion that took place in the 19th International Conference on BD.

Computed tomography pulmonary angiography (CTPA) in Behçet's disease patients: a remarkable gender gap and time to refine the treatment strategy

OBJECTIVE

The aim of the work was to delineate the computed tomography pulmonary angiography (CTPA) findings in Behçet's disease (BD) patients with and without chest manifestations.

PATIENTS AND METHODS

The study included 122 BD adults recruited from 5 Teaching University Hospitals in Egypt of those who agreed to perform a CTPA. The Arabic version of BD current activity form (BDCAF) and BD damage index (BDI) were assessed. Detailed pulmonary manifestations, examination, plain radiology chest, and CTPA findings were recorded.

RESULTS

The mean age of patients was 36.9 ± 11.3 years, male:female was 1.8:1, disease duration 9.6 ± 8.2 years, and age at onset 28.3 ± 8.6 years. Their mean BDCAF was 4.4 ± 2.2 and BDI 3.4 ± 1.8. There were chest manifestations in 51 (41.8%) and plain chest x-ray findings in 13 (10.7%) and CTPA findings in 31 (25.4%) in the form of pulmonary thromboembolism in 15 (12.3%), pulmonary aneurysms in 7 (5.7%), pneumonia in 5 (4.1%), interstitial lung disease in 4 (3.3%) and pleural effusion in 3 (2.5%). Patients with chest manifestations had significantly higher frequency of cardiac manifestations (15.7%) compared to those without (2.8%; p = 0.023); chest x-ray findings tended to be higher (17.6% vs 5.6%; p = 0.05) while CTPA findings were significantly detected (51% vs 7%; p < 0.0001). Higher frequency of CTPA findings were in females (p < 0.0001). Yet the rate of serious pulmonary embolisms, aneurysms, and thrombosis was exclusive in males.

CONCLUSION

Meticulous investigation of the chest manifestations is warranted in BD patients to undermine the actual magnitude of pulmonary impact. CTPA provides a realistic estimate of the extent of involvement even in asymptomatic cases. Key Points • Meticulous chest assessment is warranted in Behçet's disease patients to undermine the actual magnitude of pulmonary impact • CTPA provides a realistic estimate of the extent of involvement even in asymptomatic cases.