Researchers looked at the relationship between skin blood flow and chronic kidney disease (CKD) in a small group of 150 people. The study focused on how blood moves through the tiny vessels in the skin, using a method called Laser Doppler flowmetry to measure perfusion.
The study found that certain patterns in skin blood flow were linked to kidney health. Specifically, higher baseline blood flow in the skin was associated with lower kidney function (eGFR). Additionally, a reduced ability for these skin vessels to respond to changes in temperature was also linked to lower kidney function.
When looking at a smaller group of 20 participants who had kidney biopsies, the researchers found that these skin blood flow patterns were also associated with more severe kidney scarring and damage. However, these skin measurements did not show a link to protein levels in the urine.
Because this was an observational study, it shows a link rather than proving that skin blood flow changes cause kidney disease. The findings are early, and the group of people with biopsy data was quite small. More research is needed to understand what these connections mean for patient care.