Calculate the net glomerular filtration pressure - 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 10-31-2011
USMLE Forums Master
 
Steps History: Not yet
Posts: 674
Threads: 264
Thanked 963 Times in 394 Posts
Reputation: 973
Send a message via Yahoo to ricko335
Kidney Calculate the net glomerular filtration pressure

At the afferent arteriolar end of a glomerular capillary, the glomerular capillary hydrostatic pressure is 50 mmHg. In Bowman’s space the hydrostatic pressure is 10 mmHg and the glomerular capillary oncotic pressure is 27 mmHg. Given these measurements, what is the value and direction of the net ultrafiltration pressure?

A. 33 mmHg positive filtration
B. 33 mmHg negative filtration
C. 43 mmHg negative filtration
D. 13 mmHg positive filtration
E. 13 mmHg negative filtration
Reply With Quote Quick reply to this message
The above post was thanked by:
N Nur (02-03-2012)



  #2  
Old 10-31-2011
USMLE Forums Newbie
 
Steps History: Not yet
Posts: 7
Threads: 1
Thanked 1 Time in 1 Post
Reputation: 11
Default

13 positive filtration
Reply With Quote Quick reply to this message
  #3  
Old 10-31-2011
bronchiole's Avatar
USMLE Forums Addict
 
Steps History: Step 1 Only
Posts: 121
Threads: 18
Thanked 66 Times in 37 Posts
Reputation: 76
Default

answer is d
Reply With Quote Quick reply to this message
 
  #4  
Old 10-31-2011
USMLE Forums Veteran
 
Steps History: 1+CK+CS
Posts: 207
Threads: 68
Thanked 85 Times in 57 Posts
Reputation: 95
Default

D, 13mmHg positive filtration
Reply With Quote Quick reply to this message
  #5  
Old 11-01-2011
USMLE Forums Scout
 
Steps History: Not yet
Posts: 59
Threads: 19
Thanked 3 Times in 3 Posts
Reputation: 13
Default

13 mmhg postive pressure
Reply With Quote Quick reply to this message
  #6  
Old 11-01-2011
USMLE Forums Master
 
Steps History: Not yet
Posts: 674
Threads: 264
Thanked 963 Times in 394 Posts
Reputation: 973
Send a message via Yahoo to ricko335
Default

The correct answer is D.
The driving force of glomerular filtration is the net ultrafiltration pressure across the glomerular capillaries. Using Starling’s equation:
Net pressure = [ (HPgc – HP bs) – (OPgc – OP bs)]
= 50-10 - 27
= 13.
Positive values favor filtration.
Reply With Quote Quick reply to this message
The above post was thanked by:
naush (11-01-2011)



Reply

Tags
Physiology-, Renal-, Step-1-Questions

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
how to calculate GFR laurier USMLE Step 1 Forum 1 10-24-2011 07:30 PM
Mean Arterial Pressure versus Mean Systemic Filling Pressure? researchmedicine USMLE Step 1 Forum 2 09-15-2011 10:00 PM
Filtration Fraction in Renal Artery stenosis drnirajmavani USMLE Step 1 Forum 4 08-25-2011 07:24 PM
Affecting the glomerular capillary hydrostatic pressure! INCOGNITO USMLE Step 1 Forum 9 07-11-2011 05:29 AM
Calculate the filtration fraction aktorque USMLE Step 1 Forum 2 02-23-2011 10:14 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)