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Re: PI umbilical cord dopplerFrom: DuboseTerryJ@uams.eduThu Mar 22 07:43:42 2001
Do you believe that the PI is better than the RI for evaluating fetal well-being? I realize that theoretically the PI may be more sensitive to changes in systolic vs diastolic flow, but it is much more difficult to calculate unless you have very new equipment that automatically traces out the wave form. On older machines it seems that the calculation of the PI is much more error prone and time consuming. As for the question "What is the accepted variance in PI for cord doppler?" Because it changes (negative correlation with age) as gestation progresses, wouldn't one need to refer to a chart or graph for the best evaluation of variance, depending upon the gestation age rather than using a single, arbitrary number? Any opinions? Terry J. DuBose, M.S., RDMS, Assistant Professor Director, Diagnostic Medical Sonography Program CHRP, University of Arkansas for Medical Sciences Little Rock, Arkansas, USA 501-686-6510 http://www.io.com/~dubose/ http://www.uams.edu/CHRP/dmshome.htm http://www.obgyn.net/us/panel/panel.htm -----Original Message----- From: Kilavuz@aol.com [mailto:Kilavuz@aol.com] Sent: Wednesday, March 21, 2001 6:12 PM To: Multiple recipients of list ULTRASOUND Subject: Re: PI umbilical cord doppler Dear Debbie, I am senior register in a hospital in Berlin - Germany. In Germany the doctors are doing Ultrasound- Doppler examminations. We have here a lot experience about prenatal Doppler. Your question is one of the most important thing in our duty. So I think you should accept the best value of PI or S/D ratio in cases between 24-32 GWs. For the prevent very preterm deliveries. In cases with pathological Doppler above 32 GWs we should not to wait so long time.We should deliver them , so I think we should accept the highest values. Best regards, Ömer Kilavuz
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