Joel M. Topf, MD FACP Profile picture
Apr 7, 2022 15 tweets 7 min read Read on X
Brad Rovin from The Ohio State University. Hmm are they in the #FrozenFour? No. No they re not #GoBlue #NKFClinicals
Brad is a fill in for Samir Parik
He has massive COI all over the place. Every drug. Every company. #NKFClinicals Image
Starts out with a case. Cr up from 0.6 to 1.2. 3500 mg of protein. Biopsy is WHO 4 and 5. She does not respond to MMF and steroids. Then does not respond to CYT. What to do?

Beware of getting on the roulette wheel of immunosuppression Image
An operational definition of refractory lupus nephritis. Image
Less than 20% of people are taking the drugs at 12 months. This is a huge problem. #NKFClinicals Image
HCQ levels are particularly useful. HCQ has along half live, 7-40 days so a low or zero level cannot be attributed to forgetting a dose. Similarly, just taking the drug before going to the doctor will not result in a therapeutic level. #NKFClinicals
Improve adherence. Good luck. Cost reduction with belimumab and voclosporin 🤣 #NKFClinicals Image
Be patient it takes several months to get response. Late response is possible. But should see some movement (25% reduction in proteinuria) in 2-3 months. #NKFClinicals ImageImage
🚨 EXPERT OPINION 🚨 #NKFClinicals Image
He just described the KDIGO guidelines that came out last fall as “In the old days” #NKFClinicals
The new therapies (voclosporin and belimumab) did not test on refractory lupus. But there are post-how analysis…one interpretation is best response to people with prior immunosuppression exposure. #NKFClinicals Image
The best data for rescue therapy is with rituximab. After that…welcome to the Wild West. All kinds of things have been tried from CASR-T to stem cell to leflunomide, anti-IL-2, etc. #NKFClinicals
Intensive B-Cell depletion. Impressive, but N=12 #NKFClinicals Image
Back to the case. Patient went for repeat biopsy and turned out immunocompromised were gone and she now had TMA from antiphospholipid antibody syndrome. #NKFClinicals
Summary slide Image

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More from @kidney_boy

Apr 13
When we published our study <> of ODS and hyponatremia we were pummeled for including people at low risk of ODS because we included Na levels between 120 and 130. They said it is well known "that ODS is incredibly rare/non-existent at those levels." 1/4evidence.nejm.org/doi/10.1056/EV…
Of course one of the reasons it was thought to be incredibly rare was that no one looked for CPM in patients with Na from 120-130. We found a fair number (≤5 of 12). 2/4 Image
Our findings are replicated in a study from Australia. The authors took a different approach to investigating ODS. Instead of starting w/ hyponatremia and working forward to ODS, they started with a dx of ODS and worked backwards
3/4ncbi.nlm.nih.gov/pubmed/35717664
Read 4 tweets
Sep 17, 2023
Gadolinium in dialysis patients.
What's up with that?
#Tweetorial
1/11
Nephrogenic systemic fibrosis (NSF) is an iatrogenic disease that presents with hardening of the skin and other organs. It is often lethal. I treated 5 people with this condition (including one with AKI). Terrible.
2/11 Image
The etiology of NSF was unknown and there were many theories. In 2006, Thomas Grobner published a small case series showing 5 patients developing NSF within weeks of receiving gadolinium contrast for MRI.
3/11pubmed.ncbi.nlm.nih.gov/16431890/
Read 12 tweets
Aug 12, 2023
I just recently recommended the Renal Physiology book by Bruce Koeppen and Bruce Stanton. I thought it was a good medical student level text book: pbfluids.com/2023/08/ouwb-s…
But I came across this question in Chapter 8 Regulation of Acid Base. It is a straight forward question asking the learner to interpret simple acid-base cases. Image
But the question falls apart when you look at the answer... Image
Read 7 tweets
Apr 14, 2023
Lab guy from Yale up next Joe El Khoury He is on YouTube. Episode 1 was on pseudohyponatemia
209 subscribers. Clinical Chemistry with Joe El-Khoury Image
Here is the YouTube channel: youtube.com/@ClinChemJoe

https://t.co/LWupt0HWN1 #NKFClinicals
Despite calling it “laboratory error”, a lot of the problem happens long before the sample gets to the lab. #NKFClinicals Image
Read 9 tweets
Apr 14, 2023
Pseudohyperkalemia
Serum potassium is higher than plasma potassium. #NKFClinicals ImageImage
Sometimes Fist clenching
Sometimes Tourniquet
in the NEJM 1990 Image
Seasonal temp effects on potassium #NKFClinicals Image
Read 8 tweets
Apr 14, 2023
Michael Emmett on electrolyte artifacts
Pre-analytical and analytical #NKFClinicals Image
Starting with pseudohyponatremia
These are real cases
The osmolality was 294, so there is a huge gap. 44ish
Implies Artifactual decrease in sodium
Her triglycerides were >6000 #NKFClinicals Image
Note the different between HCO3 and tCO2 should be closer than 19 and 9. #NKFClinicals Image
Read 12 tweets

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