Re: amniotic fluid volumes
From: Charlie Chambers (ricechaz@gorge.net)
Wed Jun 14 12:02:11 2006
I've certainly felt that way. I still do an AFI for an "objective"
measure for fluid volume. But, like the 2X2 pocket for clinical
management. We've been having a discussion of how much volume of
fluid would you expect at rupture for a certain AFI. I've been
arguing that it's not very predictive.
On Jun 14, 2006, at 8:54 AM, art fougner, md wrote:
> Magann found both AFI and single vertical pocket depth to be weak
> predictors of abnormal amniotic fluid volumes.
>
> Obstet Gynecol. 2000 Nov;96(5 Pt 1):737-40.
>
> Art
>
> At Wed, 14 Jun 2006, Efrain Ramirez wrote:
>>
>> I might be wrong but I think that each vertical centimeter equals to
>> approximately 40-50 cc of AF?
>>
>> Ef
>>>
>> At Tue, 13 Jun 2006, Dr. Ainsworth wrote:
>>>
>>> Looks like the best reference is Chamberlain, Manning, et.al;
>>> Ultrasound
>>> evaluation of amniotic fluid volume, Am J Obstet Gynecol, 1984;
>>> 150:245-249. The classic article on Amniotic fluid volume in
>>> pregnancy
>>> is by Queenan, also in Am J Obstet Gynecol, 114: 34, 1972. There
>>> is a
>>> good graph in his book, Management of High-risk pregnancy. It shows
>>> amniotic fluid volume peaking around 34wks, with a mean of ~900
>>> and a
>>> range of 400-1300 mL (+ or – 1 SD). How long it takes to
>>> reaccumulate
>>> depends on pathologic process. He states that the fetus produces
>>> 43 mL
>>> of urine per hour and the average exchange between mother and
>>> fetus is
>>> 3600 mL per hour, according to studies from 1959 by Hutchinson.
>>>
>>> Ronald E. Ainsworth, MD, FACOG
>>>
>>> At Mon, 12 Jun 2006, Dr. Ainsworth wrote:
>>>>
>>>> I'll resend this message tomorrow from my office, half of the
>>>> message is
>>>> missing!! Any idea why this and other emails I've sent are
>>>> truncated? Is
>>>> it happening at the OB-gyn website, or is it happening in my email
>>>> program, Outlook??
>>>>
>>>> At Mon, 12 Jun 2006, ainsron wrote:
>>>>>
>>>>> Looks like the best reference is Chamberlain, Manning, et.al;
>>>>> Ultrasound
>>>>> 150:245-249.
>>>>> The classic article on Amniotic fluid volume in pregnancy is by
>>>>> Queenan,
>>>>> his
>>>>> book, Management of High-risk pregnancy. It shows amniotic
>>>>> fluid volume
>>>>> or -
>>>>> 1 SD). How long it takes to reaccumulate depends on pathologic
>>>>> process. He
>>>>> states that the fetus produces 43 mL of urine per hour and the
>>>>> average
>>>>> studies
>>>>> from 1959 by Hutchinson.
>>>>>
>>>>> Ronald E. Ainsworth, MD, FACOG
>>>>>
>>>>> -----Original Message-----
>>>>> Charlie
>>>>> Chambers
>>>>> Sent: Monday, June 12, 2006 12:57 PM
>>>>> To: Multiple recipients of list OB-GYN-L
>>>>> Subject: amniotic fluid volumes
>>>>>
>>>>> I'm trying to correlate AFI's to true amniotic fluid volume.
>>>>> Does anyone
>>>>> normal
>>>>> true volume at term? And lastly, if one performs a reduction
>>>>> amnio, over
>>>>> what length of time does the fluid reaccumulate?
>>>>>
>>>>> Thanks for the help. I couldn't find it in my references.
>>>>>
>>>>> --
>>>>> Charlie Chambers
>>>>>
>>>>> Hood River, OR
>>>>>
>>>>> cchamber@alumni.rice.edu
>>>>>
>>>>> "No matter where you go...
>>>>>
>>>>> there you are."
>>>>>
>>>>> Dr. Buckaroo Banzai
>>>>>
>>>>> ******************************************************************
>>>>> ******
>>>>>
>>>>> ******************************************************************
>>>>> ******
>>>>> ******************************************************************
>>>>> ******
>>>>> ******************************************************************
>>>>> ******
>>>>> ******************************************************************
>>>>> ******
>>>>>
>> --
>> “ The greatest obstacle to knowledge is not ignorance,
>> it is the illusion of knowledge.” Daniel J. Boorstin - Historian
>>
>
> --
> art fougner, md
> "I drank what?" - Socrates
************************************************************************
****
Charlie Chambers
Hood River, OR
cchamber@alumni.rice.edu
"Almost anything you do will seem insignificant but it is very important
that you do it....You must be the change you wish to see in the world"
-- Mahatma Ghandi.
************************************************************************
*******
