Postprandial RFR Predicts Empagliflozin GFR Dip: RENALIS & RACELINES

Postprandial RFR Predicts Empagliflozin GFR Dip: RENALIS & RACELINES

Glomerular hyperfiltration at the single-nephron level often precedes detectable whole-kidney GFR decline in type 2 diabetes (T2D). Renal functional reserve (RFR), measured as the postprandial GFR increase, may unmask this hidden hyperfiltration. Sodium-glucose co-transporter-2 inhibitors (SGLT2i) like empagliflozin reduce intraglomerular pressure via tubuloglomerular feedback, often causing an initial GFR dip. We hypothesized that lower baseline postprandial RFR predicts greater empagliflozin-induced GFR reduction, but not responses to dipeptidyl-peptidase-4 inhibitor (linagliptin) or sulfonylurea.