Assessment of fetal atrioventricular time intervals by tissue Doppler and pulse Doppler echocardiography: normal values and correlation with fetal electrocardiography

摘要

ObjectiveTo establish gestational age‐specific reference values of normal fetal atrioventricular (AV) time interval by spectral tissue Doppler imaging (TDI) and pulse‐wave Doppler (PD) methods, and to assess their correlation with signal‐averaged fetal PR intervals (ECG).