Due to the steady increase in the burden of HFpEF, especially in women, it is an important task to search for new markers and early predictors associated with the development of this disease. Nowadays, the relationship of adverse pregnancy factors with the development of long-term cardiac pathology, in particular, HFpEF, has not been completely established. One of the most significant issue is studying the younger phenotype of women. The goal of this observational analytical cross-sectional study is to study the relationship of heart failure with a preserved ejection fraction in middle-aged women with adverse pregnancy outcomes in the history of pregnancy. Research question: is there an association between adverse pregnancy factors and the development of HF in middle-aged women? Objectives 1. To assess the frequency of detection of APOs in the history of pregnancy in middle-aged women, depending on the presence or absence of HFpEF. 2. To compare clinical and anamnestic data, morphological and functional parameters of the heart in middle-aged women with the presence and absence of HFpEF. 3. To establish an association between APOs and the development of HFpEF in the long-term period in middle-aged women. 4. To identify mediators between the presence of APOs and the development of HFpEF in middle-aged women. Study population - 45-60 year-old women with the history of pregnancy (\>20 weeks) in the absence of low left ventricle ejection fraction (\<50%) Primary endpoint: The prevalence of HFpEF in patients with the history of APOs.