Uremic pruritus: pathophysiology, clinical presentation, and treatments

Abstract

Uremic pruritus is one of the most common and bothersome symptoms in patients with end-stage renal disease. Most patients with uremic pruritus experience a prolonged and relapsing course and significant impairments of quality of life. The pathophysiology of uremic pruritus is not completely understood. A complex interplay among cutaneous biology and the nervous and immune systems has been implicated, with the involvement of various inflammatory mediators, neurotransmitters, and opioids. Uremic pruritus treatment outcomes are often unsatisfactory. Clinical trials have mostly been small in scale and have reported inconsistent results. Recent evidence shows that gabapentinoids, nalfurafine, and difelikefalin are effective for relieving uremic pruritus in hemodialysis patients. This review provides an overview of the epidemiology and proposed mechanisms of uremic pruritus, then highlights the manifestations of and clinical approach to uremic pruritus. Current evidence regarding treatment options, including topical treatments, treatment of underlying disease, phototherapy, and systemic treatments, is also outlined. With a better understanding of uremic pruritus, more therapeutic options can be expected in the near future.

Keywords: Chronic kidney failure; Chronic renal insufficiency; Gabapentin; Pregabalin; Pruritus.

Figure 1.. The pathophysiology of uremic pruritus.

The mechanism of uremic pruritus implicates an interplay among cutaneous biology, the nervous system, and the immune system with the involvement of inflammatory mediators, neurotransmitters, and opioids. hs-CRP, high sensitivity C-reactive protein; IL, interleukin; Th1, T-helper 1.