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Re: fetal Heart rate....Basic/Advance OB ultrasound report From: DuBose, Terry (DuboseTerryJ@uams.edu) Tue Aug 7 16:14:45 2001 Messages sorted by: [ date ][ thread ][ subject ][ author ] Next message: Dr. Joe Antony: "fetal Heart rate....Basic/Advance OB ultrasound report" Previous message: Dr Fazeel uz Zaman: "Re: fetal Heart rate....Basic/Advance OB ultrasound report" Maybe in reply to: Dr. Joe Antony: "fetal Heart rate....Basic/Advance OB ultrasound report" Next in thread: Dr Fazeel uz Zaman: "Re: fetal Heart rate....Basic/Advance OB ultrasound report" My associates don't call me Verbose DuBose for nothing! ;-) I type every character... but will use a cut and paste from prior documents if I have any. I don't even use a secretary for formal letters... I do ALL my own transcription. I'll take your comment as a compliment... thanks. 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 3:57 PM To: Multiple recipients of list ULTRASOUND Subject: Re: fetal Heart rate....Basic/Advance OB ultrasound report Dear tery .......... thanks for the prompt reply. Now tell me do u actually type your answers or have got some speech-to-text stuff?? You are prolific writer and answerer........if there is such a term. Dr. Fazeel "DuBose, Terry" wrote: > 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 Next message: Dr. Joe Antony: "fetal Heart rate....Basic/Advance OB ultrasound report" Previous message: Dr Fazeel uz Zaman: "Re: fetal Heart rate....Basic/Advance OB ultrasound report" Maybe in reply to: Dr. Joe Antony: "fetal Heart rate....Basic/Advance OB ultrasound report" Next in thread: Dr Fazeel uz Zaman: "Re: fetal Heart rate....Basic/Advance OB ultrasound report"

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