Nephrology
Clinical discussions on kidney disease management, dialysis, transplantation, and electrolyte disorders.
Recent Discussions
What is your approach to performing outpatient hemodialysis in patients with LVADs, particularly regarding blood pressure assessment and ultrafiltration management when Doppler measurements are required due to low pulsatility?
Doppler-based MAP monitoring via Doppler ultrasound with a sphygmomanometer is the primary method for blood pressure monitoring during hemodialysis in these patients with LVAD. Crit-Line monitoring during hemodialysis may potentially be useful in guiding the rate of ultrafiltration in these patients...
How do you advise patients with recurrent nephrolithiasis and polyuria who require more than one 24 hour collection jug and need to adequately mix the specimens prior to aliquoting for mail-off lab analysis?
My understanding of methods for dealing with large volume collections (more than 1 container) is that each container is sampled and tested separately, and the results are combined by the processing laboratory to provide the actual 24-hour totals. While one could envision methods for mixing the conte...
What is your approach to managing patients with recurrent nephrolithiasis and hypercalciuria who develop sun photosensitivity following thiazide diuretic initiation?
Sun avoidance and/or protection are my first thoughts. Failing that, I would recommend more intense dietary modification and look for other metabolic abnormalities amenable to pharmaceutical treatment. Treatment follow-up is critically important, preferably with CT scanning, looking to see if there ...
What is your approach for managing patients with recurrent nephrolithiasis and hypercalciuria who experience significant urinary frequency symptoms after starting a thiazide diuretic?
To some degree, an increase in urine volume and frequency is expected and even desirable after starting a diuretic. Diluting urinary mineral concentration is a major goal in inactivating metabolic stone disease. If frequent voiding is problematic, urological consultation might be in order, looking f...
Would you pursue a kidney biopsy in a patient with stable stage 1 AKI, bland urine sediment, and a positive MPO titer without systemic signs of vasculitis?
PR3-ANCA and MPO-ANCA are associated with substantially higher specificities and positive predictive values for ANCA-associated vasculitis (AAV) than the immunofluorescence patterns to which they usually correspond (C-ANCA and P-ANCA, respectively). However, false-positive results remain a concern. ...
Has your management of post-transplant FSGS changed with the advent of new FSGS directed therapies?
The pathogenesis of FSGS and specifically recurrent FSGS post-transplant has remained an unmet need in nephrology. Multiple purported " circulating permeability factors " have been identified over the years, each of them providing a piece of the picture, but none that comprehensively and definitivel...
How do you determine the optimal time to restart a diuretic in a patient with cirrhosis, ascites, and lower extremity edema who presented with acute kidney injury that resolved with IV albumin and holding diuretics?
Good question. It is tricky. Spironolactone can be resumed fairly quickly. With loop diuretics it is harder to resume them. If necessary, I would resume at lower dose and slowly uptitrate as needed with close monitoring. Ideally, it is better to do frequent paracentesis with albumin infusion than gi...
What is your approach for managing patients with recurrent nephrolithiasis who have elevated urinary cystine levels but calcium oxalate stone composition?
This is usually heterozygous cystinuria, and the urine cystine is in the range of 50 mg. Supersaturation with cystine is absent, and the cystine can be ignored. Rarely, urine cystine is high enough to produce stones, and I treat both stone risk factors. In all cases where urine cystine is above 100 ...
Should a patient who requires definitive treatment for prostate cancer as a pre-transplant requirement be strictly required to complete their course prior to transplant/initiation of immunosuppression?
To help address this complex question, I would like to call your attention to a review of the topic by Al-Adra et al., PMID 32969590. It covers several types of malignancies, including prostate cancer (Table 4). Treating this patient will require close collaboration with the transplant surgeon, urol...
How do you distinguish TMA caused by CNI toxicity versus antibody mediated rejection in a kidney transplant patient?
It really boils down to "the company you keep". If the biopsy shows evidence of antibody-mediated rejection with peritubular capillaritis, glomerulitis, or C4d positivity, I would lean towards AMR-associated TMA. Also need to always consider whether the primary cause of the ESKD. Was there an undiag...