A pregnant woman is 4 to 5 times more likely to suffer a thromboembolic event than a non-pregnant woman. Furthermore, an increase in these episodes has been observed in women infected with SARS-CoV-2. Consequently, the prophylactic prescription of low-molecular-weight heparins (LMWH) in pregnant women is undergoing an increase that has not been evaluated yet. The aim of this study was to determine the prevalence of LMWH prescription in pregnant women at the Hospital Universitario Puerta de Hierro Majadahonda (HUPHM), according to their level of risk and its variation due to SARS-CoV-2 infection. To answer this question, a retrospective cohort of 113 women who gave birth during the month of February at the HUPHM was designed. The level of individual risk of thromboembolism, according to the Royal College guidelines (37a), was calculated with an interview to complete a questionnaire and the analysis of their clinical records. 53.6% of the women were prescribed LMWH as indicated in the guidelines. This high prevalence is explained by the high age of the pregnant women (over 35 years), the wave of the omicron variant (December 2021) and a high rate of cesarean sections (25%). On the other hand, the percentage of patients with COVID-19 was 17.6% but only 53% of them had received LMWH. In conclusion, LMWH is a very common prescription in obstetrics, mostly during puerperium, and has become even more relevant due to the COVID-19 pandemic
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