Re: amniotic fluid volumes
From: Efrain Ramirez (eramirezt@coqui.net)
Wed Jun 14 13:18:46 2006
What do you think about "eye volume"? -- Have you seen that after a
while - 15-30 minutes or so - sometimes there seems to be larger
pockets? This is, obviously, anecdotally..
Ef
At Wed, 14 Jun 2006, Charlie Chambers wrote:
>
>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 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
>
>>>> 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.
>
>>>>>> Queenan,
>>>>>> his
>>>>>> book, Management of High-risk pregnancy. It shows amniotic
>>>>>> fluid volume
>>>>>> or -
>
>>>>>> 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.
>
>*******
>
--
“ The greatest obstacle to knowledge is not ignorance,
it is the illusion of knowledge.” Daniel J. Boorstin - Historian
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