Prep for USMLEPrep for USMLE Forum
   Forum    Step 1  Step 2 CK Step 2 CS Step 3  Match  IMGs Resources Search






Previous Topic | Next Topic  PNH help 




 
Kaplan Qbank USMLE



Author4 Posts
  #1

hey I remember that PNH=paroxistical nocturnal hemolytic anemia is caused by a problem in a receptor that the RBC dont have so they are expose to be attack, now thats from UW, but conrad and goljan says that is because we get acid during night.

Can someone explain the phyiopathology of this.

thanks

___________________
As a general rule, the better it felt when you said it, the more trouble it's going to get you into.

  #2

PNH = it is due to lack of DAF in the RBC memb which protects them from the acidic env

so essentially it a memb defect in RBC leading to haemolytic anemia

  #3

in PNH, there is phosphatadyl indol glycan 1 (PIG1) defic, leading to memb defect..This is d t stem cell abnormality.

complement will stick to the RBCs leading to increased vulnerability to rupture esp at night d t CO2 retntion, & ofcourse folate def helps (larger cells)

DAF(decay accelerating factor is an invesstig for diag, not a factr defic)

mort d t Budd Chiari synd (thromboembolism)

hope that helps


  #4

Thanks guys for the reply, t5hats what I remember


___________________
As a general rule, the better it felt when you said it, the more trouble it's going to get you into.







You don't have permission to post.




Login or Register to post messages in this topic





















Contact | Leaders | Disclaimer | Privacy

Copyright @ Prep for USMLE. All rights reserved.