Objectives: To propose a biventricular performance index based on the average valuesof the duration of the cardiac cycle of each of the ventricles, to determine the variableincluded in the study with the most significant statistical correlation, to establishreference values that allow the work of each ventricle to be identified according to thisvariable, and to obtain a balanced biventricular output index. Methodology: Prospectiveand cross-sectional study in fetuses of 168 pregnant women, in pregnancies between16 and 38 weeks without maternal-fetal pathologies. Flow velocity waves were obtainedfrom both atrioventricular valves and the total systole-diastole cycle time was calculatedin milliseconds for each valve. Averages, standard deviation, and Z-score were calculatedof the systolic-diastolic time for each ventricle and the individual ventricular performanceindex (VPI) were calculated ...

Objective: To demonstrate by dissection of anatomical specimens and prenatalultrasonographic images of the fetal heart the presence of the cardiac fulcrum asa fixation structure supporting the helical myocardial band. Methods: Six heartsof fetuses between 20-24 weeks of gestational age resulting from spontaneousabortions were dissected, finding the cardiac fulcrum in the proximity of the aortaand connections with myocardial fibers. In 50 singleton pregnancies with fetusesbetween 18-37 weeks of gestation, fetal cardiac ultrasonography was used to obtain2D, Doppler, color and three-dimensional modalities, STIC, HD Flow and speckletracking, images, fulcrum measurements and its kinetics. Results: With the describedstrategy, the presence of the cardiac fulcrum or myocardial lever was identifiedand demonstrated, establishing its anatomical characteristics, connections withmyocardial fibers of ...