Evaluate the Impact of Diabetes on RA-related outcomes in an Electronic Health Record-Based Rheumatology Registry
Objective RA patients with diabetes might have worse clinical outcomes and adverse events compared to non-diabetes patients. We evaluated the effects of diabetes on HAQ (Health Assessment Questionnaire) change and outpatient infection in RA patients. Methods Using the ACR’s Rheumatology Informatics System for Effectiveness (RISE) EHR-based registry, we identified RA patients who had ≥1 rheumatologist visit with a HAQ measured (index visit) in 2016, ≥1 previous visit, and a subsequent outcome visit with same HAQ measured at 12 months (± 3 months). We identified diabetes by diagnosis codes, medications, or lab values. Outpatient infection was defined by diagnosis codes or anti-infective medications. We calculated mean HAQ change and incidence rate (IR) of outpatient infections among patients with and without diabetes. Generalized linear models and Cox regression were used to calculate the adjusted mean HAQ change and hazard ratios (HR). Results We identified 3,853 RA patients with diabetes and 18,487 without diabetes. The mean HAQ change between index and outcome visit among diabetes patients was 0.03 and non-diabetic was 0.002 (p<0.01). We identified 761 outpatient infections for diabetic patients with an IR of 22.6 (95% CI: 21.0-24.2) per 100 person years and 3,239 among non-diabetic patients with an IR of 19.8 (19.1-20.5). The adjusted HR of outpatient infection among diabetes was 0.99 (0.91-1.07), compared to non-diabetes patients. Conclusion RA patients with concomitant diabetes had greater worsening, or less improvement, in their functional status, suggesting additional interventions may be needed for RA patients with diabetes to optimize treatment and other comorbidities.