Risk factors for prevalent and incident hypertension in rheumatoid arthritis: data from the Canadian Early Arthritis Cohort

Objective: Hypertension (HTN) is a common comorbidity in RA. This study aimed to explore the prevalence and incidence of HTN and baseline factors associated with incident HTN in early RA (ERA).

Methods: Data were from the Canadian Early Arthritis Cohort (CATCH), an inception cohort of ERA patients having <1 year of disease duration. HTN was determined by patient- or physician-reported diagnosis, the use of anti-hypertensives and/or blood pressure. Multivariable logistic regression was performed to determine baseline factors associated with prevalent and incident HTN in this population.

Results: The study sample included 2052 ERA patients [mean age 55 years (s.d. 14), 71% female). The prevalence of HTN at study enrolment was 26% (23% in females and 34% in males). In both sexes, prevalent HTN was associated with older age, diabetes and hyperlipidaemia. HTN was associated with being overweight or high alcohol consumption in females. Of the RA patients who did not have HTN at enrolment, 24% (364/1518) developed HTN during the median follow-up period of 5 years (range 1-8). Baseline factors significantly associated with incident HTN were older age, being overweight, excess alcohol consumption and having hyperlipidaemia. Incident HTN was associated with high alcohol consumption in males and with hyperlipidaemia in females. RA-associated disease factors and treatments were not significantly associated with prevalent or incident HTN.

Conclusions: Early RA patients had a high incidence of hypertension with the highest risk in older patients with traditional cardiovascular risk factors.