Re: [ozmidwifery] Ultra sound SD ratios

[Graham & Helen]

Hello Bethany I am a sonographer - we do these Umb Art Doppler studies to provide info about possible underlying circulation problems in pregnancy.  It seems the info you have found online is accurate but I just wanted to add a couple of points to the discussion.    1.  The normal S/D ratio level depends on the gestational age of the pregnancy.  2.  The S/D ratio is manifested in a wave form during the ultrasound and the appearance of the waveform is also analysed in addition to the S/D ratio and influences the overall significance of the findings.   If the ratio is above normal limits it can indicate an abnormal/insufficient blood flow through the placenta to the foetus with the potential to affect the growth of the foetus causing IUGR.    The results of the ultrasound would have been interpreted by a Radiologist who reports to the client's doctor recommending any further investigations.  It is also important to look at the clinical picture in conjunction with the ultrasound findings.   Hope this helps.   Cheers   Graham      ----- Original Message ----- From: "Neretlis, Bethany" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, August 31, 2003 12:53 AM Subject: RE: [ozmidwifery] Ultra sound SD ratios Hi Claudia, we had an IOl due to iugr and an elevated s/d ratio. we also didn't quite understand what that meant, so i tried to look it up on the internet. i found one article that was about iugr, which healped a bit. Systolic/Diastolic ratio is determined when they are doing a flow wave picture of the pressures within the umbilical artery. the ratio is the differences between the peak of the wave ( the systolic pressure reading) and the trough of the wave ( the diastolic reading). I gathered that the s/d ratio is a bit like blood pressure, so a raised s/d ratio would be bad as the babys bp would be raised due to placental problems in this instance. the change in the s/d ratio is a worsening step in the path of iugr which, if severe enough, would eventually lead to feotal death. Please can anyone else tell me if i have got this correctly. the article was a bit hard to understand when trying to get a concept for which they assumed readers would already be conversant with. love Bethany -----Original Message----- From: Claudia van Duyn [mailto:[EMAIL PROTECTED] Sent: Friday, 29 August 2003 12:13 To: [EMAIL PROTECTED] Subject: [ozmidwifery] Ultra sound SD ratios Hello fellow midwives  Could someone please inform me on the significance of the umbilical artery SD ratio. Background - a client has a slightly raised SD ratio.  Client reports that at the ultra sound the SD ratio was normally around 3 - 3.6 and one was 5.7. I am baffled and would really appreciate some information on this.  I questioned the Doctor - he is also unsure but not concerned. Claudia Yahoo! Search - Looking for more? Try the new Yahoo! Search -- This mailing list is sponsored by ACE Graphics. Visit <http://www.acegraphics.com.au> to subscribe or unsubscribe.