Background: Several studies have demonstrated that the levels of inflammatory markers in healthy women are under the influence of menstrual cycle changes. The aim of this study was to compare blood levels of inflammatory markers in women with appendicitis in different phases of menstrual cycle. Materials and Methods: In this case-control study, 70 female and 12 male patients with appendicitis, and 61 healthy women were enrolled based on inclusion and exclusion criteria. Inflammatory markers, such as leukocyte count, CRP, ESR, and TNF-α were measured and compared using student t-test and one-way ANOVA based on different phases of menstrual cycle. Results: There were no significant changes in the ESR, CRP, and TNF-α concentrations and the number of peripheral blood leukocytes in different phases of the menstrual cycle in women with appendicitis. The mean number of leukocytes and CRP concentrations were significantly higher in patients with appendicitis compared with the control group. Conclusion: The findings show that there are not significant differences in the inflammatory markers in women with appendicitis during the different phases of menstrual cycles. It seems that day to day variation of sexual hormones in the menstrual cycle have led to very different conclusions about the change of inflammatory markers in different phases of menstrual cycle. Therefore, studies investigating inflammatory markers in women with acute appendicitis based on day of menstrual cycle, time of sampling in the day, and severity of appendicitis are suggested.

Keywords: Acute appendicitis, C - reactive protein, Leukocyte, Menstrual cycle

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