Introduction: Historically, visual estimation of blood loss during and after delivery has been the primary method for determining obstetric blood loss. This method is quick, easy, and cost-free, and it allows for the prompt identification of suspected postpartum hemorrhage. However, the majority of clinical studies concur that this method is imprecise and may underestimate the extent of bleeding produced during vaginal delivery. Objectives: The objective of this study was to compare the concordance between the estimated blood loss observed visually by physicians and residents of Gynecology and Obstetrics and the actual bleeding observed in a simulation exercise, with the aim of calculating the bleeding. terial and methods: A quasi-experimental study was conducted through the use of a simulation model at the General Hospital of Zone 20 of the IMSS in Puebla. A visual estimation was conducted between physicians and residents using surgical material (compresses and gauze) with a certain amount of blood. The evaluation of the estimate was carried out in three stations with different bleeding levels. The estimation of total bleeding was counted in milliliters using the visual method. A comparison of means was conducted using the ANOVA statistical test to evaluate the bleeding calculation. The relative error was calculated in order to determine the extent of agreement between the estimated and actual blood values for each station. Results: A total of 94 physicians, including residents in training in the specialty of Gynecology and Obstetrics, enrolled in the study. The discrepancy between the actual and estimated blood loss in a simulation exercise among affiliated obstetrician-gynecologists was 65.3%, while in the group of resident physicians it was 145.6%. It was determined that there was an 84% overestimation of bleeding. The relative error percentage for "Scenario A" was 141%, "Scenario C" yielded a result of 85%, and "Scenario B" produced a result of 74%. Conclusion: The agreement between the actual and estimated blood loss performed by obstetrician-gynecologists assigned to a bleeding calculation simulation exercise is slightly superior to that obtained by resident physicians. The lowest percentages of relative error were obtained by fourth- and third-year residents.
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