Are Doppler methods appropriate for the study of adaptive maternal central circulation regulation in pregnancy

: Echocardiographic Doppler measurements of blood flow velocity are a noninvasive way of studying maternal central haemodynamics. Part 1 reports on conditions as well as on practical and theoretical problems recognized as contributing significantly to the use and interpretation of Doppler ultrasound techniques in the assessment of adaptive central circulatory regulation in pregnancy. The significance of different techniques is shown by assessments of the peak velocity and the velocity time integral.