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Allergic reactions and risk of vulvodynia – Source: Annals of Epidemiology, Nov 2009

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By Bernard L Harlow, et al. • www.ProHealth.com • April 23, 2010


[Note: An estimated 80% of vulvodynia patients also have interstitial cystitis, and the histamine/inflammation-generating mast cells that drive allergic reactions are frequently found in bladder tissue of IC patients, according to the Interstitial Cystitis Association.]

Purpose: A recent histological study of vestibular tissue from women with localized vulvodynia found universal presence of mast cells compared to no presence in vestibular tissue among controls. Since histamine is generated by mast cells, and mast cells contribute to the production of cytokines during chronic inflammation, we assessed the association between conditions that elicit a clinically relevant histamine response and vulvodynia.

Methods: We studied 239 women with and 239 women without vulvodynia to assess the influence of self-reported allergic reactions antecedent to first development of vulvar pain symptoms among cases, and a matched reference age among controls.

Results:

•  Women with self-reported hives prior to first report of vulvar pain or reference age among controls were 2.5 times more likely to develop vulvodynia (95% confidence interval [CI], 1.7-4.4).

•  Those reporting a history of allergic reactions to insect bites were 2.1 times more likely (95%CI, 1.1-4.0),

•  And those reporting a history of seasonal allergies were 2.0 times (95%CI, 1.3-3.2) more likely to develop vulvodynia. Findings were similar in a restricted subset of clinically confirmed cases and matched controls.

Conclusions: An altered immuno-inflammatory response to environmentally induced allergic reactions:

•  May predispose women to the development of vulvodynia,

•  Or may be markers of an already heightened immuno-inflammatory response.

Source: Annals of Epidemiology, Nov 2009. 19(11):771-7. PMID: 19825458, by Harlow BL, He W, Nguyen RH. University of Minnesota, School of Public Health, Division of Epidemiology & Community Health, Minneapolis, Minnesota, USA. [E-mail: harlow@umn.edu]





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