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fazeel_fetalveinFrom: dr udayakumar (drudaya@vsnl.com)Sun Nov 25 17:03:35 2007
--Boundary_(ID_Hl0lDLhXvD6MRIdHhwhu9Q) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Its due to maternal breathing. The undulation is an artefact produced by small changes in doppler angle produced by movement of the maternal abdominal wall. Since the sample volume includes both vessels ( viz., the umbical artery and umb vein) in both the pictures, the effect is seen in both arterial and venous waveforms. ..Dr.Udayakumar, Chennai, India --Boundary_(ID_Hl0lDLhXvD6MRIdHhwhu9Q) Content-type: text/html; charset=iso-8859-1 Content-transfer-encoding: 7BIT <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> Its due to maternal breathing. The undulation is an
artefact produced by small changes in doppler angle produced by movement of the
maternal abdominal wall. Since the sample volume includes both vessels (
viz., the umbical artery and umb vein) in both the pictures, the effect is
seen in both arterial and venous waveforms.
..Dr.Udayakumar, Chennai,
India
--Boundary_(ID_Hl0lDLhXvD6MRIdHhwhu9Q)--
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