ANCA-associated renal vasculitis is associated with rurality but not seasonality or deprivation in a complete national cohort study

Aiyegbusi, O. et al. (2021) ANCA-associated renal vasculitis is associated with rurality but not seasonality or deprivation in a complete national cohort study. RMD Open, 7(2), e001555. (doi: 10.1136/rmdopen-2020-001555) (PMID:33875562) (PMCID:PMC8057563)

Abstract

Background: Small studies suggest an association between ANCA-associated vasculitis (AAV) incidence and rurality, seasonality and socioeconomic deprivation. We examined the incidence of kidney biopsy-proven AAV and its relationship with these factors in the adult Scottish population. Methods: Using the Scottish Renal Biopsy Registry, all adult native kidney biopsies performed between 2014 and 2018 with a diagnosis of granulomatosis with polyangiitis (GPA) or microscopic polyangiitis (MPA) were identified. The Scottish Government Urban Rural Classification was used for rurality analysis. Seasons were defined as autumn (September–November), winter (December–February), spring (March–May) and summer (June–August). Patients were separated into quintiles of socioeconomic deprivation using the validated Scottish Index of Multiple Deprivation and incidence standardised to age. Estimated glomerular filtration rate and urine protein:creatinine ratio at time of biopsy were used to assess disease severity. Results: 339 cases of renal AAV were identified, of which 62% had MPA and 38% had GPA diagnosis. AAV incidence was 15.1 per million population per year (pmp/year). Mean age was 66 years and 54% were female. Incidence of GPA (but not MPA) was positively associated with rurality (5.2, 8.4 and 9.1 pmp/year in ‘urban’, ‘accessible remote’ and ‘rural remote’ areas, respectively; p=0.04). The age-standardised incidence ratio was similar across all quintiles of deprivation (p=ns). Conclusions: Seasonality and disease severity did not vary across AAV study groups. In this complete national cohort study, we observed a positive association between kidney biopsy-proven GPA and rurality.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Stevens, Dr Kathryn and Frleta-Gilchrist, Dr Marina and McQuarrie, Dr Emily and Mackinnon, Dr Bruce and Dey, Dr Vishal and Traynor, Dr Jamie and Geddes, Dr Colin
• Authors: Aiyegbusi, O., Frleta-Gilchrist, M., Traynor, J. P., Mackinnon, B., Bell, S., Hunter, R. W., Dhaun, N., Kidder, D., Stewart, G., Joss, N., Kelly, M., Shah, S., Dey, V., Buck, K., Stevens, K. I., Geddes, C. C., and McQuarrie, E. P.
• College/School: College of Medical Veterinary and Life Sciences > School of Cardiovascular & Metabolic Health; College of Medical Veterinary and Life Sciences > School of Infection & Immunity; College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing
• Journal Name: RMD Open
• Publisher: BMJ Publishing Group
• ISSN: 2056-5933
• ISSN (Online): 2056-5933
• Published Online: 19 April 2021
• Copyright Holders: Copyright © 2021 The Authors
• First Published: First published in RMD Open 7(2): e001555
• Publisher Policy: Reproduced under a Creative Commons License