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Oral communication abstractsMethods: Routine two dimensional fetal scans were performed in 123 consecutives singleton pregnancies during the second half of pregnancy. General Electric E8 ultrasound equipment was used in all cases. Mechanical PR interval was measured from the onset of the mitral A wave to the onset of the aortic ejection flow, using previously described technique for standard and modified Tei index. All measurements were taken twice by two different operators. For statistical analysis mean and standard deviation was used position measurement. For comparison between two groups and the inter observer agreement Least square analysis was performed. Results: The mechanical PR interval was easily obtained in all 123 cases. The mean gestational age was 25.5 weeks (18-38 weeks). The PR interval was 117,97ms (SD: 9.49 mseg), in standard Tei index group, and 119,11ms. (SD: 10.71 m seg) in modified Tei index group. There was a positive correlation between PR interval and gestational age (COV 2.48). There was no significant difference between both groups (t student 99%:261 > t calculated −0,068). Difference between Inter observer was not significant (t student 99%: 2,61 > t calculated −0.087). Conclusion:The pulsed Doppler assessment using standard and modified Tei index approach of the mechanical PR interval in the fetus, is a feasible and could be used to explore the fetal atrio ventricular conduction abnormalities. It is reproducible and easily obtained during the routine second half of gestation and the normal range is similar to that described with other methods. Objective: We sought to compare two methods of estimation of fetal myocardial function across gestation from our database of normal fetuses. Methods: In a retrospective cross sectional study, we compared left ventricular shortening fraction (LVSF) from m-mode ultrasound and pulsed Doppler ultrasound timing of flow patterns from the left ventricular outflow tract to determine the myocardial performance (Tei) index. The LVSF was calculated from the formula: LVDD-LVSD/LVDD. All measurements were taken in the lower third of the LV below the mitral valve when the m-mode line of insonation was perpendicular to the ventricular septum. The Tei index measured the specific systolic time intervals created by the movement of the anterior leaflet of the mitral valve and the aortic valve leaflets within the pulsed Doppler sample placed over and parallel to flow in the LV outflow tract. The Tei index utilized the ''clicks'' method where the spike artifacts (clicks) in the Doppler signal were used to measure isovolumetric contraction time (ICT), systolic ejection time (LVET) and isovolumetric relaxation time (IRT). The Tei index was determined from the formula: ICT + IRT/ LVET. Results: 3200 fetal echocardiograms performed over a 4 year period were available for review of the LV function parameters of LVSF and Tei index. Normal LVSF from m-mode measurements across gestation remains linear and constant from 11 weeks until term at 0.41 (+/− 0.12). LV myocardial ...