Thread by @IM_Crit_

I was checking again today about DKA/HHS in a very modern & easy to read textbook and I saw this about the Na correction:

The Katz correction factor is 1.6 mEq/L for every 100 mg/dL that the serum Glu exceeds 100 mg/dL & the Hillier correction factor is 2.4 mEq/L

amjmed.com/article/S0002-…

It seems that the textbook 👆 uses a sodium correction factor of < 1.0 mEq/L for every 100 mg/dL of Glu above 100 or applies the correction starting from a higher Glu level (probably 200 mg/dL?)

Since the textbook's author is in #MedTwitter, this post may help correcting the correction factor or it may teach me something I am not aware of

To nephrologists: please help!

#FOAMed #FOAMcc #MedEd #EMBound @NephroP @MynephCC @ArgaizR #MedStudentTwitter

Since we dive in the past, let's talk a bit more about the famous Katz's paper/formula published in 1973. It was essentially a letter to the editor, and it was not based on patients' data. The formula was derived by a calculation in "a hypothetically normal patient"...

w several assumptions. It must be one of the most influential papers in medicine (especially Internal Medicine) since it had zero evidentiary basis & we use it every day for the last 50 yrs. BTW, Katz did not use a Glu threshold of 400 mg/dl; pls check this graph from his paper:

Old good times! You could publish a letter in NEJM and affect practice for the next century...

#Foamed #FOAMcc

@msiuba @siddharth_dugar @Wilkinsonjonny @khaycock2 @TaotePOCUS @nickmmark @cjosephy @MegriMohammed @emily_fri @curromir @Thind888