Acute Kidney Injury- Pathoma or first aid?

[rodmichael82]

Pathoma and First aid 2014 are a little off when it comes to the values for Pre-renal Azotmenia, Intrinsic Renal failure and Postrenal azotemia.
Which one is correct?

Pathoma says
Pre-renal azotemia:- BUN/ CR > 15, Urine osmolality > 500, First aid says BUN/CR > 20
Post-renal azotemia there's two phases first phase is okay so the same values are pre-renal azotemia. Late phase he says it's BUN/CR < 15 and Urine osmolality being < 500. Where as first aid only talks about BUN/CR being > 15 in post-renal and urina osmolality being < 350.

Does it really matter that these numbers are kind of different?

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[notbobtrustme]

i haven't calculated a BUN:creatinine ratio ever and renal has always been one of my highest scoring sections. It's much more helpful to look at the whole clinical picture.

 

[Priapism4tooLong]

Pathoma and First aid 2014 are a little off when it comes to the values for Pre-renal Azotmenia, Intrinsic Renal failure and Postrenal azotemia.
Which one is correct?

Pathoma says
Pre-renal azotemia:- BUN/ CR > 15, Urine osmolality > 500, First aid says BUN/CR > 20
Post-renal azotemia there's two phases first phase is okay so the same values are pre-renal azotemia. Late phase he says it's BUN/CR < 15 and Urine osmolality being < 500. Where as first aid only talks about BUN/CR being > 15 in post-renal and urina osmolality being < 350.

Does it really matter that these numbers are kind of different?

i haven't calculated a BUN:creatinine ratio ever and renal has always been one of my highest scoring sections. It's much more helpful to look at the whole clinical picture.

He's right, don't worry about BUN:CR so much. When you do MCQ's look in the history for dehydration or hints for an obstruction.

 

[rodmichael82]

Alright guys thanks!!

 

[sab3156]

Bump.

Just want to ask: Are the actual values for BUN/Cr, FE Na, Urine concentration of Na, and Urine osmolality important, or should one just understand something along the lines of the following, for example: "in pre-renal acute kidney injury, the FE Na is reduced, Serum BUN/Cr is increased, Urine Na is normal, and Urine is concentrated".

Is that sufficient, or should we memorize actual values for these things?