Objective: Although several observational studies have reported a higher risk of cardiovascular events in women who underwent hysterectomy, the underlying mechanism is unclear, and limited data exist regarding the effect of hysterectomy on the incidence of hypertension. We sought to evaluate the association between hysterectomy and the development of hypertension in Korean women aged 40–59 years. Design and method: In this Korean nationwide cohort study, 803,255 women aged 40-59 years were selected for analysis from January 1, 2002, to December 31, 2011. In total, 13,650 pairs were included in the hysterectomy and non-hysterectomy groups after 1:1 propensity score matching for age at 5-year intervals, year of inclusion, socioeconomic status, body mass index, residential region, Charlson comorbidity index, menarcheal age, menopause, diabetes, dyslipidemia, physical activity, smoking history, alcohol consumption, menopausal hormone therapy before inclusion, adnexal surgery history, uterine leiomyoma, and endometriosis. The primary outcome was the development of hypertension during follow-up. The participants were followed-up until December 31, 2020. Data analysis was performed from July 16, 2022 to January 07, 2023. Results: During median follow-up periods (10.6 years [IQR 9.2-12.6]; 10.9 years [IQR 9.2-12.7]), the incidence of hypertension was 22/1,000 person-years and 20/1,000 person-years for the hysterectomy and non-hysterectomy groups, respectively. The hysterectomy group had a significantly higher rate of development of hypertension than that of the non-hysterectomy group (hazard ratio [HR], 1.11; 95% confidence interval [CI], 1.05-1.17). The risk was prominent in women whose hemoglobin level increased by >2g/dL post-hysterectomy. In women who had an adnexa-sparing hysterectomy, the incidence of hypertension was higher (HR, 1.15; 95% CI 1.08-1.23, P <0.001) than that in the non-hysterectomy group. Conclusions: In this nationwide cohort study of Korean women revealed that hysterectomy was independently associated with an increased risk of hypertension among women aged 40 to 59. In particular, this risk elevation was prominent when the hemoglobin level increased by >2g/dL after hysterectomy, suggesting that hemorheologic changes following hysterectomy may have an impact on the occurrence of hypertension.
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