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Increased Mortality for Individuals With Giant Cell Arteritis: A Population-Based Study.

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Giant cell arteritis (GCA) patients face increased mortality compared to the general population, with higher rates in males. This excess mortality risk did not improve over 19 years, indicating a persistent public health concern.

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Area of Science:

  • Rheumatology
  • Epidemiology
  • Public Health

Background:

  • Giant cell arteritis (GCA) is a large-vessel vasculitis with reported variable mortality risks.
  • Previous studies on GCA mortality have yielded mixed results, necessitating further investigation.

Purpose of the Study:

  • To evaluate all-cause mortality in individuals diagnosed with giant cell arteritis (GCA) in comparison to the general population.
  • To analyze trends in GCA mortality over a 19-year period.

Main Methods:

  • A population-based cohort study was conducted in Ontario, Canada, utilizing health administrative data.
  • A cohort of 22,677 GCA patients (age ≥50) was identified using a validated case definition, with general population comparators.
  • All-cause mortality rates and standardized mortality ratios (SMRs) were calculated between 2000 and 2018.

Main Results:

  • Age- and sex-standardized mortality rates were significantly higher in GCA patients than in comparators, increasing from 50.0 to 57.6 deaths per 1,000 patients between 2000 and 2018.
  • The standardized mortality ratio (SMR) for GCA patients generally increased over time, reaching its highest point in 2018 (1.92).
  • Mortality rates were more elevated in male GCA patients compared to female patients.

Conclusions:

  • Over a 19-year period, GCA patients experienced increased mortality relative to the general population.
  • Premature deaths were more common in younger age groups within the GCA cohort.
  • The relative excess mortality associated with GCA did not show improvement over the study period.