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Re: fetal Heart rate....Basic/Advance OB ultrasound reportFrom: DuBose, Terry (DuboseTerryJ@uams.edu)Tue Aug 7 15:45:32 2001
Dr. Fazeel, that is a very old [mid]wife's tale. In fact that was the question that came up that led to my first notice of the heart rate curve. In 1982 I had started working with personal computers... first was a Sinclair Z80A with 2k of ram, and saving files to audio tape... not very dependable. By 1984 I had a DOS machine, wrote the first version of BASIC BABY (written in Basic programming language, thus the name) and we started accumulating data. We (Austin Radiological Association, Austin Texas) were actually trying to develop more accurate estimates for fetal weight and age. We gave 1000 women self-addressed post cards asking about birthing information, weight, length, birth date, APGAR, days before discharge, and gender of the fetus. Once we started getting information back, someone mentioned this tale that her aunt had told her. She asked "Can you see if it is true that the heart rate predicts the sex of the baby?" It was fairly easy to plot out the data, and run an ANOVA on the heart rates for males and females. The following image is the actual plot from the 1994-1987 data: http://www.obgyn.net/english/pubs/features/dubose/Image13.gif The pink circles are female, and the blue squares are males... confirmed at birth, with heart rates measured during pregnancy via M-mode. You can see there is no difference in males or females. While we found no difference in male and female heart rates, it was that plot that first showed the feed-back damping curve of the developing human heart. It was then that I realized that a linear regression on the EHR could be used to estimate embryonic age (before the curve peaked). It was about 10 years later (1994) that we realized the significance of the low EHRs and that there was not a single threshold but is also age dependent. I, and others, have worked up numerous higher order polynomials to describe the heart rate curve. See: DuBose TJ, FETAL SONOGRAPHY, W. B. Saunders Co. 1996, Chapter 12, Heart Rate. It has now been over 15 years that I have studied the embryofetal heart rate. I can assure you there is absolutely no statistical difference in female or male heart rates at any time in gestation. It is more age dependent before about 15-18 weeks, and depends upon other factors in the last half of pregnancy such as fetal activity and maternal sugar intake. Please have your colleague read the following: http://www.obgyn.net/english/pubs/features/dubose/ehr-age.htm and http://www.obgyn.net/us/cotm/0001/ehr2000.htm I would like to know how many genders she predicted correctly out of what size population... Thanks for your interest. Peace, Terry J. DuBose, M.S., RDMS, APS 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: Dr Fazeel uz Zaman [mailto:fazeel@atd.hazara.net.pk] Sent: Tuesday, August 07, 2001 3:03 PM To: Multiple recipients of list ULTRASOUND Subject: Re: fetal Heart rate....Basic/Advance OB ultrasound report Dear Terry, You have a great interest in fetal heart rates.........did you also observe this?.... In a local ultrasound conference in Pakistan, a doctor presented a paper that female fetuses tend to have faster heart rates (probably she coated 146/min and above) than male fetuses.....and she accurately predicted fetal heart when not seen the gender yet.....as in early pregnancy or even in late pregnancy. Dr.Fazeel Terry J DuBose wrote:
> I agree with this list of observations and measurements for obstetrical
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