Neurological Complications of Chronic Kidney Disease

Abstract

Uremic encephalopathy (UE), a spectrum of brain dysfunction caused by toxin buildup in kidney failure, presents with symptoms ranging from fatigue to coma. Seizures are another complication in CKD patients, with uremic seizures being a specific type. Stroke risk is also significantly elevated in CKD due to traditional and CKD-specific factors like inflammation. Restless Legs Syndrome (RLS), characterized by unpleasant sensations in the legs and an urge to move, is highly prevalent in CKD patients, especially those on dialysis. Myoclonus, sudden involuntary muscle jerks, is another neurological symptom linked to uremia. Dialysis itself can cause complications. Dialysis Disequilibrium Syndrome (DDS) presents with neurological symptoms due to rapid fluid shifts during hemodialysis (HD). Dialysis dementia, a rare consequence of historical aluminum exposure, is practically nonexistent with improved dialysis practices. CKD is a strong risk factor for cognitive decline and dementia, even independent of traditional risk factors. Dialysis offers limited benefit, while kidney transplantation can improve cognitive function. Central pontine myelinolysis (CPM) damages the protective sheath around nerve fibers in the brainstem due to rapid correction of low blood sodium. Uremic myopathy weakens muscles, particularly in the legs and hips, in advanced CKD. Carpal Tunnel Syndrome (CTS), a common neuropathy in dialysis patients, presents with numbness, tingling, and weakness. Ischemic Monomelic Neuropathy (IMN) and peripheral neuropathy are other neurological complications arising from CKD. In conclusion, CKD causes central and peripheral nervous system complications due to a complex interplay of uremic toxins, metabolic imbalances, and other factors. Neurological sequelae of uremia significantly impact patient morbidity and mortality. Optimizing renal replacement therapies, alongside targeted correction of co-existing metabolic and medical derangements, remains paramount for both preventing and treating these complications. Furthermore, a deeper understanding of the potential pathogenic mechanisms underlying these neurological manifestations is crucial for the development of improved therapeutic strategies.