How does Polyhydramnios develop? - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
Home
USMLE Articles
USMLE News
USMLE Polls
USMLE Books
USMLE Apps
Go Back   USMLE Forums > USMLE Step 1 Forum

USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 02-26-2012
nadee's Avatar
USMLE Forums Scout
 
Steps History: Not yet
Posts: 53
Threads: 7
Thanked 16 Times in 12 Posts
Reputation: 26
Question How does Polyhydramnios develop?

Can anybody pls explain how annular pancreas also esophageal atresia cause polyhydramnios and bilateral renal agenesis cause oligohydramnios????wt is the mechanism for that??:S

Last edited by nadee; 02-26-2012 at 11:25 AM.
Reply With Quote Quick reply to this message



  #2  
Old 02-26-2012
nadee's Avatar
USMLE Forums Scout
 
Steps History: Not yet
Posts: 53
Threads: 7
Thanked 16 Times in 12 Posts
Reputation: 26
Default

Anybody pls???
Reply With Quote Quick reply to this message
  #3  
Old 02-26-2012
USMLE Forums Master
 
Steps History: 1+CK+CS
Posts: 1,406
Threads: 118
Thanked 644 Times in 408 Posts
Reputation: 654
Default

ok remember in utero the amniotic fluid is reused and recycled
it is swallowed, then pee'ed out, then swallowed again

now if you can't swallow it, it will cause polyhydramnios
this is the case with anular pancreas, esophageal atresia or any other such problem which will prevent the amniotic fluid from entering the fetus' body and continue the cycle.

likewise, if you have renal agenesis, then you cant pee it out. so there will be oligohydramnios.

its a cycle
pee it out, swallow it in, and repeat.
a problem with peeing = oligohydramnios
a problem with taking it in = polyhydramnios
__________________
"inflammable means flammable!? What a country."
Reply With Quote Quick reply to this message
The above post was thanked by:
nadee (02-26-2012)
 
  #4  
Old 02-26-2012
avash.nrs's Avatar
USMLE Forums Guru
 
Steps History: Step 1 Only
Posts: 440
Threads: 52
Thanked 258 Times in 153 Posts
Reputation: 268
Default

if u have read ur embrology u must have seen that a foetus passes urine...and the urine goes into amniotic cavity..not all urine cannot be cleared out by maternal blood..but the foetus(poor fella) has to pee..it(consider male or female as u like it) as a remdial measure swallows some amniotic fluid(that now u know contains urine of itself too...thus amniotic cavity volume is constant..as foetus also swallows some amniotic fluid and it goes down gi tract..into kidney(meso neprhos or metanephros by 26 weeks)..gets filtered and again passed in amniotic cavity...and again swallowed by the foetus..thus a vicious cycle goes on and u see gi tract obstruction obstucts this cycle and u see polyhydramnios and renal agenesis causes oligohydramnios...basically its easy(all thanks to david seiden..i knew this from his video lecture only)..this process is also important for lung development(remember potters syndrome)..thus it ends all..hope it helps..and yeah we all in our foetal days drank our urine..
Reply With Quote Quick reply to this message
The above post was thanked by:
nadee (02-26-2012)
  #5  
Old 02-26-2012
nadee's Avatar
USMLE Forums Scout
 
Steps History: Not yet
Posts: 53
Threads: 7
Thanked 16 Times in 12 Posts
Reputation: 26
Default

Quote:
Originally Posted by Dr.NickRiviera View Post
ok remember in utero the amniotic fluid is reused and recycled
it is swallowed, then pee'ed out, then swallowed again

now if you can't swallow it, it will cause polyhydramnios
this is the case with anular pancreas, esophageal atresia or any other such problem which will prevent the amniotic fluid from entering the fetus' body and continue the cycle.

likewise, if you have renal agenesis, then you cant pee it out. so there will be oligohydramnios.

its a cycle
pee it out, swallow it in, and repeat.
a problem with peeing = oligohydramnios
a problem with taking it in = polyhydramnios
Yeppeee got it. Thnx a lot Dr.NickRiviera 😊
Reply With Quote Quick reply to this message
  #6  
Old 02-26-2012
nadee's Avatar
USMLE Forums Scout
 
Steps History: Not yet
Posts: 53
Threads: 7
Thanked 16 Times in 12 Posts
Reputation: 26
Default

Quote:
Originally Posted by avash.nrs View Post
if u have read ur embrology u must have seen that a foetus passes urine...and the urine goes into amniotic cavity..not all urine cannot be cleared out by maternal blood..but the foetus(poor fella) has to pee..it(consider male or female as u like it) as a remdial measure swallows some amniotic fluid(that now u know contains urine of itself too...thus amniotic cavity volume is constant..as foetus also swallows some amniotic fluid and it goes down gi tract..into kidney(meso neprhos or metanephros by 26 weeks)..gets filtered and again passed in amniotic cavity...and again swallowed by the foetus..thus a vicious cycle goes on and u see gi tract obstruction obstucts this cycle and u see polyhydramnios and renal agenesis causes oligohydramnios...basically its easy(all thanks to david seiden..i knew this from his video lecture only)..this process is also important for lung development(remember potters syndrome)..thus it ends all..hope it helps..and yeah we all in our foetal days drank our urine..
Yeahh got it.....😊thnx a lot avash.nrs. U make me laugh...will never forget this explanation. Thnx again!!!😊
Reply With Quote Quick reply to this message



Reply

Tags
Embryology-

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Location
Where you live. Leave blank if you don't want to tell.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Firm Uterus and history of Polyhydramnios drnrpatel USMLE Step 2 CK Forum 7 12-02-2011 07:13 AM
Why polyhydramnios in congenital diaphragmatic hernia chienpolska USMLE Step 2 CK Forum 2 11-26-2011 08:35 AM
Organs that develop from primordial gut doctorF USMLE Step 1 Forum 2 04-15-2010 02:15 PM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)