Uremia-Induced Complications

Pathophysiological Mechanisms

• Uremic toxins, including indoxyl sulfate, acrolein, indole-3-acetic acid, urea, and p-cresol, accumulate and directly damage neural tissue, leading to neuroinflammation and oxidative stress 1, 2
• Hemodialysis induces significant reduction in global and regional cerebral blood flow, causing cerebral "stunning" and intradialytic hemodynamic instability, which leads to ischemic white matter changes and cognitive dysfunction 3, 4
• Indoxyl sulfate raises cytosolic Ca²⁺ concentration and stimulates erythrocyte membrane scrambling, amplifying phosphatidylserine exposure on red blood cell surfaces, and provokes enhancement of ceramide levels, further accelerating eryptosis 1, 2
• Accelerated eryptosis leads to activation of blood clotting via phosphatidylserine-mediated mechanisms and causes damage to endothelial cells through adherence of eryptotic cells, creating endothelial dysfunction that promotes both bleeding and thrombotic tendencies 1, 2
• Uremic toxins likely trigger inflammatory cytokine release that affects serosal membranes, and oxidative stress and inflammation from uremic toxins create systemic inflammatory conditions 1, 2, 5
• Renal replacement therapy remains the definitive treatment by removing accumulated uremic toxins, though dialysis itself can paradoxically worsen some complications through hemodynamic instability and cerebral blood flow dysregulation 3, 4, 6