Carlo Salvarani; Sherine E. Gabriel; W. Michael O'Fallon; Gene G. Hunder
To investigate trends in the incidence of giant cell arteritis over a 42-year period in Olmsted County, Minnesota.
Population-based incidence study.
Olmsted County, Minnesota.
All incidence cases of giant cell arteritis first diagnosed between 1950 and 1991 were identified using the unified record system at Mayo Clinic. Age- and sex-specific incidence rates were calculated using the number of incidence cases as the numerator and population estimates as the denominator. Overall rates were age-and sex-adjusted to the 1980 United States white population. The annual incidence rates were graphically illustrated using a 3-year centered moving average.
Between 1950 and 1991, 125 Olmsted County residents (103 women and 22 men) were diagnosed with giant cell arteritis. The age- and sex-adjusted incidence per 100 000 persons 50 years of age or older was 17.8 (95% CI, 14.7 to 21.0); incidence was significantly higher in women (24.2 [CI, 19.5 to 28.9]) than in men (8.2 [CI, 4.8 to 11.6]). Age-specific incidence rates increased with age (P < 0.0001). The annual incidence rates increased significantly over the study period (P = 0.002) and appear to have clustered in five peak periods, which occurred about every 7 years. A significant calendar-time effect was identified; it predicted an increase in incidence of 2.6% (CI, 0.9% to 4.3%) every 5 years.
Our observation of a regular cyclic pattern in incidence rates over time supports the hypothesis of an infectious cause for giant cell arteritis. Similar studies in other populations are needed to confirm our findings.
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Salvarani C, Gabriel SE, O'Fallon WM, Hunder GG. The Incidence of Giant Cell Arteritis in Olmsted County, Minnesota: Apparent Fluctuations in a Cyclic Pattern. Ann Intern Med. 1995;123:192–194. doi: 10.7326/0003-4819-123-3-199508010-00006
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Published: Ann Intern Med. 1995;123(3):192-194.
Giant Cell Arteritis/Polymyalgia Rheumatica, Neurology, Rheumatology, Vasculitides.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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