WOMENS-HEALTH Messages for October, 1997: Re: Marginal Placenta Previa

Re: Marginal Placenta Previa

From: Linda (anonymous@obgyn.net)
Mon, 27 Oct 1997 01:33:06 -0600 (CST)

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In reply to: Melissa: "Marginal Placenta Previa"

At Sat, 25 Oct 1997, Melissa wrote: >
>Hi,
>
>I am 31weeks LMP, and I was diagnoised at 27weeks with a marginal
>placenta previa(anterior). I have had three episodes of APH with no
>contractions or dilation. Baby has good heart rates and movements.
>
>Placenta is not on the os. Only had one hospitalization of 24hours.
>What are the chances of placental migration at this point? The placenta
>is across the top and down the left side.
>
>How many more APH episodes can I realistically expect? I have not been
>put on bedrest, should I be? Any help would be appreciated. Thanks so
>much.
>
>--
>Thanks so much,
>Melissa
>

--
The placenta doesn't really "migrate" on the uterine wall.
The uterus does grow and carry the placenta with it, usually
upward as the lower uterine wall thins.
At 31 weeks, you will have some more growth upward and there
is a good chance the placenta will be more distant from the
os at term.
You didn't say if the infant is vertex (head first).  If it is,
then the fetal head will put pressure on that lower edge of
the placenta, even if it is a little low at term, as the
infant drops down near term.  There is no way to know about
further episodes of bleeding.  The placenta is made up of
about 15 codyldons (compartments).  Each has separate blood
vessels, so that even if one bleeds, the others continue to
function.  Like so many body systems, the placenta has
"planned redundancy".  Infants can get by on 50% of the
placenta, but we don't like to "test it".
Good luck.

Next message: Mal: "rectal bleeding"
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In reply to: Melissa: "Marginal Placenta Previa"

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