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Re: 18 Week "Previa" From: T Dubose (tjdubose@chrp.uams.edu) Tue Sep 24 08:46:04 1996 Messages sorted by: [ date ][ thread ][ subject ][ author ] Next message: charlie chambers: "campomelic dysplasia" Previous message: T Dubose: "Re: 18 Week "Previa"" Maybe in reply to: Ronald Helm: "18 Week "Previa"" Next in thread: Robert Brenner: "Re: 18 Week "Previa"" The discussion below is precisely correct, the placental attachments do not move. However, they do exhibit trophotropism in that there is a propensity to grow toward nutritive blood supplies and away from diminished supply. Trophotropism simply and elegantly explains margnal and velamentous insertions, vasa previa, succenturiate lobes and a number of placental oddities. This has been researched and discussed by Fineberg HJ (Arizona), The placenta and umbilical cord: Recent observations. Lecture and SDMS official proceedings, 10th Annual SDMS Conference, Anaheim, CA, 1993; p. 241. Also, see DuBose TJ, Fetal Sonography, W. B. Saunders Co, Philadelphia, 1996, p. 362. Terry J. DuBose, M.S., RDMS; Assistant Professor Program Director, Diagnostic Medical Sonography University of Arkansas for Medical Sciences, tjdubose@chrp.uams.edu http://www.io.com/~dubose/ VOICE: 501-686-6510 FAX: 501-686-5613 Now is the time for all good folks to come to the aid of the Earth. -- ---------- From: CheriCNM@aol.com To: Multiple recipients of list Subject: Re: 18 Week "Previa" Date: Monday, September 23, 1996 3:58PM << Placentas are always firmly attached to the uterine wall and are never peripatetic. The placenta never moves. snip...... >> My midwifery school mentor, the late James Green, MD, had a slightly different theory about "placental migration." He believed the likelier possibility is that the placenta, as it increases in size as the fetus grows and the pregnancy advances, develops assymetrically, in the direction of the richer endometrium toward the fundus, rather than continuing to grow symmetrically. He further believed that if you looked at the placentas which were identified in the second trimester as having been low-lying and/or partial previas you would find that many or most of them would exhibit a marginal cord insertion, rather than a more centrally located cord insertion. I always thought this made a lot of sense, though I've never conducted a systematic review of charts to see if these early U/S results were correlated with marginal cord insertions. I think it would be interesting, however. Cheri Van Hoover, CNM Kaiser Hospital Redwood City, CA Next message: charlie chambers: "campomelic dysplasia" Previous message: T Dubose: "Re: 18 Week "Previa"" Maybe in reply to: Ronald Helm: "18 Week "Previa"" Next in thread: Robert Brenner: "Re: 18 Week "Previa""

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